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• Crash Report in Ubuntu... hardware problem?

  - by Andrew

  Got this on my machine. I was just browsing the web on Chrome and my computer froze. I recently just built this machine. I have a feeling it is a hardware problem... Possibly one of my parts arrived broken in some way.... Starting anac(h)ronistic cron Stopping anac(h)ronistic cron Stopping cold plug devices Stopping log initial device creation Starting enable remaining boot-time encrypted block devices Starting configure network device security Starting configure virtual network devices Starting save udev log and update rules Stopping configure virtual network devices Stopping save udev log and update rules Checking battery state... Stopping System V runlevel compatibility Stopping enable remaining boot-time encrypted block devices Stopping Mount filesystems on boot 91.573384] BUG: unable to handle kernel NULL pointer dereference at (null) 91.573437] IP: [<ffffffff81313514>] strcmp+0x14/0x30 91.573470] PGD 1f7822067 PUD 1ed7a6067 PMD 0 91.573498] Oops: 0000 [#1] SMP 91.573519] CPU 3 91.573531] Modules linked in: dm_crypt bnep snd_hda_codec_realtek rfcomm bluetooth parport_pc ppdev arc4 fglrx(P) rt2800usb rt2800lib crc_ccitt rt2x00usb rt2x00lib mac0021 cfg80211 psmouse snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer send_seq_device snd joydev mac_hid mei(C) soundcore serio_raw snd_page_alloc lp parport ses enclosure usbhid hid i915 drm_kms_helper drm i2c_algo_bit mxm_umi tg_video wmi usb_storage 91.573826] 91.573837] Pid: 2297, comm: update-notifier Tainted: P C O 3.2.0-29-generic #46-Ubuntu To Be Filled By O.E.M. To Be Filled By O.E.M./Z77 Extreme4 91.573912] RIP: 0010:[<ffffffff81313514>] [<ffffffff81313514>] strcmp+0x14/0x30 91.573954] RSP: 0018:ffff8801f83f5bb8 EFLAGS: 00010246 91.573982] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 91.574019] RDX: 0000000000000069 RSI: 0000000000000000 RDI: ffff88021adb26f8 91.574056] RBP: ffff8801f83f5bb8 R08: ffff88022f2d6e80 R09: 0000000000000000 91.574093] R10: ffff88021e7dbf00 R11: 0000000000000003 R12: ffff88021c10eb40 91.574130] R13: 0000000000000000 R14: ffff88021adb26f8 R15: ffff8801f83f5d40 91.574168] FS: 00007f958cf53940(0000) GS:ffff88022f2c0000(0000) kn1GS:0000000000000000 91.574210] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 91.574240] CR2: 0000000000000000 CR3: 000000021f6d7000 CR4: 00000000000406e0 91.574277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 91.574314] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000000 91.574351] Process update-notifier (pid: 2297, threadinfo ffff801f83f4000, task ffff880208fe2e00) 91.574397] Stack: 91.574409] ffff8801f83f5be8 ffffffff811ed509 ffff88021adb26c0 ffff88021b8b7020 91.574453] ffff88021b461c60 fffffffffffffffe ffff8801f83f5c18 ffffffff811ed61f 91.574496] ffff88021adb26c0 ffff88021b8b7020 ffff8801f83f5dc8 0000000000000001 91.574539] Call Trace: 91.574558] [<ffffffff811ed509] sysfs_find_dirent+0x59/0x110 91.574591] [<ffffffff811ed61f] sysfs_lookup+0x5f/0x110 91.574621] [<ffffffff81182745] d_alloc_and_lookup+0x45/0x90 91.574654] [<ffffffff8118fe65] ? d_lookup+0x35/0x60 91.574683] [<ffffffff811848d2] do_lookup+0x202/0x310 91.574712] [<ffffffff8118660c] path_lookupat+0x11c/0x750 91.574744] [<ffffffff81318db7] ? __strncpy_from_user+0x27/0x60 91.574778] [<ffffffff81186c71] do_path_lookup+0x31/0xc0 91.574809] [<ffffffff81187779] user_path_at_empty+0x59/0xa0 91.574842] [<ffffffff81187822] ? do_filp_open+0x42/0xa0 91.574872] [<ffffffff811877d1] user_path_at+0x11/0x20 91.574902] [<ffffffff8117c80a] vfs_fstatat+0x3a/0x70 91.574933] [<ffffffff81161cff] ? kmem_cache_free+0x2f/0x110 91.574965] [<ffffffff8117c85e] vfs_lstat+-x31/0x70 91.574993] [<ffffffff8117c9fa] sys_newlstat+0x1a/0x40 91.575022] [<ffffffff81176ee1] ? do_sys_open+0x171/0x220 91.575053] [<ffffffff8117cb1a] ? sys_readlinkat+0x7a/0xb0 91.575086] [<ffffffff81661ec2] system_call_fastpath+0x16/0x1b 91.575118] Code: 83 c1 01 40 84 ff 75 ef 5d c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 00 55 31 c0 48 89 e5 66 2e 0f 1f 84 00 00 00 00 00 0f b6 14 07 <3a> 14 06 75 0f 48 83 c0 01 84 d2 75 ef 31 c0 5d c3 0f 1f 00 19 91.577243] RIP [<ffffffff81313514>] strcmp+0x14/0x30 91.579314] RSP <ffff8801f83f5bb8> 91.581385] CR2: 0000000000000000

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• Torchlight Black Screen and doesn't show up

  - by Lelouch Reyiz

  When I open it in full screen I get a black screen that covers whole screen,in windowed mode middle of screen.Here is a video: https://copy.com/fvrGw7QIJ8Z0 Terminal Output: alperen@alperen-Inspiron-N5010 /usr/local/games/Torchlight $ ./Torchlight.bin.x86_64 Creating resource group General Creating resource group Internal Creating resource group Autodetect SceneManagerFactory for type 'DefaultSceneManager' registered. Registering ResourceManager for type Material Registering ResourceManager for type Mesh Registering ResourceManager for type Skeleton MovableObjectFactory for type 'ParticleSystem' registered. OverlayElementFactory for type Panel registered. OverlayElementFactory for type BorderPanel registered. OverlayElementFactory for type TextArea registered. Registering ResourceManager for type Font ArchiveFactory for archive type FileSystem registered. ArchiveFactory for archive type Zip registered. FreeImage version: 3.13.1 This program uses FreeImage, a free, open source image library supporting all common bitmap formats. See http://freeimage.sourceforge.net for details Supported formats: bmp,ico,jpg,jif,jpeg,jpe,jng,koa,iff,lbm,mng,pbm,pbm,pcd,pcx,pgm,pgm,png,ppm,ppm,ras,tga,targa,tif,tiff,wap,wbmp,wbm,psd,cut,xbm,xpm,gif,hdr,g3,sgi,exr,j2k,j2c,jp2,pfm,pct,pict,pic,bay,bmq,cr2,crw,cs1,dc2,dcr,dng,erf,fff,hdr,k25,kdc,mdc,mos,mrw,nef,orf,pef,pxn,raf,raw,rdc,sr2,srf,arw,3fr,cine,ia,kc2,mef,nrw,qtk,rw2,sti,drf,dsc,ptx,cap,iiq,rwz DDS codec registering Registering ResourceManager for type HighLevelGpuProgram Registering ResourceManager for type Compositor MovableObjectFactory for type 'Entity' registered. MovableObjectFactory for type 'Light' registered. MovableObjectFactory for type 'BillboardSet' registered. MovableObjectFactory for type 'ManualObject' registered. MovableObjectFactory for type 'BillboardChain' registered. MovableObjectFactory for type 'RibbonTrail' registered. Loading library lib64/OGRE/RenderSystem_GL Installing plugin: GL RenderSystem OpenGL Rendering Subsystem created. Plugin successfully installed Loading library lib64/OGRE/Plugin_ParticleFX Installing plugin: ParticleFX Particle Emitter Type 'Point' registered Particle Emitter Type 'Box' registered Particle Emitter Type 'Ellipsoid' registered Particle Emitter Type 'Cylinder' registered Particle Emitter Type 'Ring' registered Particle Emitter Type 'HollowEllipsoid' registered Particle Affector Type 'LinearForce' registered Particle Affector Type 'ColourFader' registered Particle Affector Type 'ColourFader2' registered Particle Affector Type 'ColourImage' registered Particle Affector Type 'ColourInterpolator' registered Particle Affector Type 'Scaler' registered Particle Affector Type 'Rotator' registered Particle Affector Type 'DirectionRandomiser' registered Particle Affector Type 'DeflectorPlane' registered Plugin successfully installed Loading library lib64/OGRE/Plugin_OctreeSceneManager Installing plugin: Octree & Terrain Scene Manager Plugin successfully installed *-*-* OGRE Initialising *-*-* Version 1.6.5 (Shoggoth) terminate called after throwing an instance of 'std::out_of_range' what(): basic_string::substr Error: signal: 6 ./Torchlight.bin.x86_64(_ZN10LinuxUtils13crash_handlerEi+0x25)[0x17eb6f5] /lib/x86_64-linux-gnu/libc.so.6(+0x37000)[0x7fc647877000] /lib/x86_64-linux-gnu/libc.so.6(gsignal+0x39)[0x7fc647876f89] /lib/x86_64-linux-gnu/libc.so.6(abort+0x148)[0x7fc64787a398] /usr/lib/x86_64-linux-gnu/libstdc++.so.6(_ZN9__gnu_cxx27__verbose_terminate_handlerEv+0x155)[0x7fc6481826b5] /usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0x5e836)[0x7fc648180836] /usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0x5e863)[0x7fc648180863] /usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0x5eaa2)[0x7fc648180aa2] /usr/lib/x86_64-linux-gnu/libstdc++.so.6(_ZSt20__throw_out_of_rangePKc+0x67)[0x7fc6481d25d7] /usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0xbe3d3)[0x7fc6481e03d3] ./Torchlight.bin.x86_64(_ZN11CFileSystem21buildMassiveDataGroupEv+0x453)[0x1617805] ./Torchlight.bin.x86_64(_ZN11CFileSystemC1Eb+0x14be)[0x16145ae] ./Torchlight.bin.x86_64(_ZN22CMasterResourceManagerC1EP9CSettings+0x41a)[0xfe1d0a] ./Torchlight.bin.x86_64(_ZN5CGame5setupEb+0x79a)[0x73ceaa] ./Torchlight.bin.x86_64(_ZN5CGame5beginEPv+0x28d)[0x73b839] ./Torchlight.bin.x86_64(main+0x649)[0x146dbe4] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x7fc647861ec5] ./Torchlight.bin.x86_64[0x739ca9]

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• Installing Age of Empires II using PlayOnLinux doesn't work?

  - by user70342

  I have tried installing age of empires 2 using PlayOnLinux, the installation appeared to go fine but when I try and open the game it says there is a serious fault. The error report is below, unfortunately this doesn't mean alot to me, I was wondering if you could help, a) By highlighting the problem and b) by suggesting a solution. Many Thanks Unhandled exception: page fault on read access to 0xffffffff in 32-bit code (0x0040aaad). Register dump: CS:0073 SS:007b DS:007b ES:007b FS:0033 GS:003b EIP:0040aaad ESP:0033fd00 EBP:0033fde4 EFLAGS:00010293( R- -- I S -A- -C) EAX:00000001 EBX:bde88d9d ECX:00000067 EDX:00400000 ESI:7b867c00 EDI:00400000 Stack dump: 0x0033fd00:00410fed 00000000 00400000 00000067 0x0033fd10:0041ab90 00130d8a 7b895848 7bc483b1 0x0033fd20:0044c800 00000002 0044bdd0 7bca4e6c 0x0033fd30:7bc3590f 00000800 00000094 00000005 0x0033fd40:00000000 00000893 00000002 76726553 0x0033fd50:20656369 6b636150 00003420 00000800 Backtrace: =0 0x0040aaad in empires2 (+0xaaad) (0x0033fde4) 1 0x0041ace2 in empires2 (+0x1ace1) (0x0033fe70) 2 0x7b85ac0c call_process_entry+0xb() in kernel32 (0x0033fe88) 3 0x7b85e13b in kernel32 (+0x4e13a) (0x0033fec8) 4 0x7bc714f0 call_thread_func_wrapper+0xb() in ntdll (0x0033fed8) 5 0x7bc7172d call_thread_func+0x7c() in ntdll (0x0033ffa8) 6 0x7bc714ce RtlRaiseException+0x21() in ntdll (0x0033ffc8) 7 0x7bc4c30e in ntdll (+0x3c30d) (0x0033ffe8) 0x0040aaad: pop %ss Modules: Module Address Debug info Name (51 modules) PE 400000- 44b000 Export empires2 PE 10000000-1000c000 Deferred drvmgt ELF 35cae000-35d24000 Deferred rpcrt4 -PE 35cc0000-35d24000 \ rpcrt4 ELF 68000000-68022000 Deferred ld-linux.so.2 ELF 68022000-681c7000 Deferred libc.so.6 ELF 681c7000-681cc000 Deferred libdl.so.2 ELF 681cc000-681f8000 Deferred libm.so.6 ELF 681f8000-68201000 Deferred libnss_compat.so.2 ELF 68201000-6821b000 Deferred libnsl.so.1 ELF 6821b000-68228000 Deferred libnss_files.so.2 ELF 68228000-68366000 Deferred user32 -PE 68240000-68366000 \ user32 ELF 68366000-68421000 Deferred gdi32 -PE 68370000-68421000 \ gdi32 ELF 68421000-68481000 Deferred advapi32 -PE 68430000-68481000 \ advapi32 ELF 68481000-68499000 Deferred version -PE 68490000-68499000 \ version ELF 68499000-68533000 Deferred libfreetype.so.6 ELF 68533000-68549000 Deferred libz.so.1 ELF 68549000-685db000 Deferred winex11 -PE 68550000-685db000 \ winex11 ELF 685db000-685e4000 Deferred libsm.so.6 ELF 685e4000-685fe000 Deferred libice.so.6 ELF 685fe000-68610000 Deferred libxext.so.6 ELF 68610000-68744000 Deferred libx11.so.6 ELF 68744000-6874a000 Deferred libuuid.so.1 ELF 6874a000-68751000 Deferred libxdmcp.so.6 ELF 68751000-68755000 Deferred libxinerama.so.1 ELF 68755000-6875b000 Deferred libxxf86vm.so.1 ELF 6875b000-68765000 Deferred libxrender.so.1 ELF 68765000-6876e000 Deferred libxrandr.so.2 ELF 6876e000-68772000 Deferred libxcomposite.so.1 ELF 68772000-68782000 Deferred libxi.so.6 ELF 68782000-687b6000 Deferred libfontconfig.so.1 ELF 687b6000-687e0000 Deferred libexpat.so.1 ELF 687e0000-687eb000 Deferred libxcursor.so.1 ELF 687eb000-687f1000 Deferred libxfixes.so.3 ELF 6f102000-6f10e000 Deferred libnss_nis.so.2 ELF 7194d000-7196e000 Deferred imm32 -PE 71950000-7196e000 \ imm32 ELF 72c76000-72db7000 Dwarf libwine.so.1 ELF 75d65000-75d86000 Deferred libxcb.so.1 ELF 79223000-79227000 Deferred libxau.so.6 ELF 7b800000-7b8f5000 Dwarf kernel32 -PE 7b810000-7b8f5000 \ kernel32 ELF 7bc00000-7bcc1000 Dwarf ntdll -PE 7bc10000-7bcc1000 \ ntdll ELF 7bf00000-7bf03000 Deferred ELF 7c708000-7c723000 Deferred libpthread.so.0 Threads: process tid prio (all id:s are in hex) 00000008 (D) C:\Program Files\Microsoft Games\Age of Empires II\empires2.exe 00000009 0 <== 0000000e services.exe 00000039 0 00000038 0 0000001f 0 00000019 0 00000018 0 00000017 0 00000015 0 00000010 0 0000000f 0 00000012 winedevice.exe 0000001e 0 0000001a 0 00000014 0 00000013 0 0000001b plugplay.exe 00000021 0 0000001d 0 0000001c 0 00000024 explorer.exe 00000025 0 00000035 winedevice.exe 0000003a 0 00000037 0 00000036 0 System information: Wine build: wine-1.4-rc1 Platform: i386 Host system: Linux Host version: 3.2.0-24-generic

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• Oracle Applications Strategy Day

  - by Oracle Aplicaciones

  Normal 0 21 false false false ES X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-fareast-language:EN-US;} Oracle y ESIC celebraron el pasado 8 de Noviembre la última edición del Roadshow Oracle Applications Strategy Day, que visitó las ciudades de Barcelona, Madrid, Valencia y Sevilla, en colaboración con nuestros partners: Arin Innovation, GFI, Golive, Neteris, Oracle+Cerca, Qualita, SDG Consulting, Steltix, Steria, Tactic, Vass. En el encuentro se evaluó el impacto de los cambios en el negocio, el aumento de la volatilidad de la información y las últimas tecnologías en el marco actual. Con la exclusiva modalidad de ponencias + coloquios + asesorías individuales, todos los asistentes dispusieron de la posibilidad de compartir experiencias y mejores prácticas de la mano de expertos del sector así como con los asistentes al encuentro. A través de los siguientes links podrá acceder a las presentaciones. - La Compañía del Futuro: Nuevas tecnologías y su integración con el Marketing y la Estrategia corporativa. Profesor D. Javier G. Recuenco. - Estrategia de Aplicaciones para PYMES. D. Ricardo Martinez, Director de Aplicaciones para el midsize market Video resumen del evento: 

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• Engineered Systems: Oracle schlägt drei Fliegen mit einer Klappe

  - by A&C Redaktion

  Normal 0 21 false false false DE X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Die News aus dem Partnergeschäft von Oracle sorgen für Schlagzeilen im Magazin ChannelPartner. Über den neuen Fokus auf Engineered Systems und die SMB Appliances heißt es dort, so könne Oracle „drei Fliegen mit einer Klappe schlagen“: Erstens wird früheren Sun Hardware-Resellern der Einstieg ins Software-Geschäft erleichtert, zweitens bieten die Appliances neue Möglichkeiten für den Mittelstand und drittens bekräftigt die Strategie das zweistufige Channel-Modell. Dazu Silvia Kaske, Senior Director Channel Sales & Alliances Oracle Deutschland: "Wir stärken weltweit den Channel, weil das SMB-Geschäft zunehmend anzieht." Neben der durchaus positiven Wertung der Channel-Strategie bietet der Artikel einen anschaulichen Überblich darüber, was Engineered Systems eigentlich sind. Außerdem werden die Einsatzmöglichkeiten (Big Data, Mobile Computing, Cloud etc.) und Angebote von Oracle in diesem Bereich dargestellt und diskutiert. Das Highlight hierbei ist – wen wundert’s – die Oracle Database Appliance. Mit dem Portfolio wächst natürlich auch die Zahl der Spezialisierungen. Logisch, findet Silvia Kaske: "Endkunden erwarten keine Generalisten, sondern Spezialisten. Nur mit einem klaren Fokus wird der Partner erfolgreich sein". Hier geht’s zum vollständigen CP-Artikel unter dem Titel „Oracle lockt Channel mit SMB-Appliances“.

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• Rewriting code under BSD license

  - by Frank

  I am currently studding OpengGL with OpenGL Supebible 5th edition. I've found interested for me some C++ code that is distributed with the book (see also on google code). That code is under New BSD License. I am writing my software on C# with SharpGL wrapper and I'd like to know following things: Can I rewrite that C++ to C#? edid: I'am interesting in using such things like GLBatch, GLShaderManager and some other thing from GLTools. Problem is that library is on C++, but I use C#. How do I have to mark my source code if I put it somewhere like to my github account? What disclaimer should be? Original disclaimer looks like: /* GLShaderManager.h Copyright (c) 2009, Richard S. Wright Jr. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of Richard S. Wright Jr. nor the names of other contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ Edit: Should my copyright looks like after rewriting something like that? Copyright (c) 2014, My Name Copyright (c) 2009, Richard S. Wright Jr. All rights reserved. Redistribution...................

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• Will polishing my current project be a better learning experience than starting a new one?

  - by Alejandro Cámara

  I started programming many years ago. Now I'm trying to make games. I have read many recommendations to start cloning some well known games like galaga, tetris, arkanoid, etc. I have also read that I should go for the whole game (including menus, sound, score, etc.). Yesterday I finished the first complete version of my arkanoid clone. But it is far from over. I can still work on it for months (I program as a hobby in my free time) implementing a screen resolution switcher, remap of the control keys, power-ups falling from broken bricks, and a huge etc. But I do not want to be forever learning how to clone ONE game. I have the urge to get to the next clone in order to apply some design ideas I have come upon while developing this arkanoid clone (at the same time I am reading the GoF book and much source code from Ludum Dare 21 game contest). So the question is: Should I keep improving the arkanoid clone until it has all the features the original game had? or should I move to the next clone (there are almost infinite games to clone) and start mending the things I did wrong with the previous clone? This can be a very subjective question, so please restrain the answers to the most effective way to learn how to make my own games (not cloning someone ideas). Thank you! CLARIFICATION In order to clarify what I have implemented I make this list: Features implemented: Bouncing capabilities (the ball bounces on walls, on bricks, and on the bar). Sounds when bouncing on bricks and the bar, and when the player wins or loses. Basic title menu (new game and exit only). Also in-game menu and win/lose menus. Only three levels, but the map system is so easy I do not think it will teach me much (am I wrong?). Features not-implemented: Power-ups when breaking the bricks. Complex bricks (with more than one "hit point" and invincible). Better graphics (I am not really good at it). Programming polishing (use more intensively the design patterns). Here's a link to its (minimal) webpage: http://blog.acamara.es/piperine/ I kind of feel ashamed to show it, so please do not hit me too hard :-) My question was related to the not-implemented features. I wondered what was the fastest (optimal) path to learn. 1) implement the not-implemented features in this project which is getting big, or 2) make a new game which probably will teach me those lessons and new ones. ANSWER I choose @ashes999 answer because, in my case, I think I should polish more and try to "ship" the game. I think all the other answers are also important to bear in mind, so if you came here having the same question, before taking a rush decision read all the discussion. Thank you all!

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• How to do geometric projection shadows?

  - by John Murdoch

  I have decided that since my game world is mostly flat I don't need better shadows than geometric projections - at least for now. The only problem is I don't even know how to do those properly - that is to produce a 4x4 matrix which would render shadows for my objects (that is, I guess, project them on a horizontal XZ plane). I would like a light source at infinity (e.g., the sun at some point in the sky) and thus parallel projection. My current code does something that looks almost right for small flying objects, but actually is a very rude approximation, as it doesn't project the objects onto the ground, but simply moves them there (I think). Also it always wrongly assumes the sun is always on the zenith (projecting straight down). Gdx.gl20.glEnable(GL10.GL_BLEND); Gdx.gl20.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA); //shells shellTexture.bind(); shader.begin(); for (ShellState state : shellStates.values()) { transform.set(camera.combined); transform.mul(state.transform); shader.setUniformMatrix("u_worldView", transform); shader.setUniformi("u_texture", 0); shellMesh.render(shader, GL10.GL_TRIANGLES); } shader.end(); // shadows shader.begin(); for (ShellState state : shellStates.values()) { transform.set(camera.combined); m4.set(state.transform); state.transform.getTranslation(v3); m4.translate(0, -v3.y + 0.5f, 0); // TODO HACK: + 0.5f is a hack to ensure the shadow appears above the ground; this is overall a hack as we are just moving the shell to the surface instead of projecting it on the surface! transform.mul(m4); shader.setUniformMatrix("u_worldView", transform); shader.setUniformi("u_texture", 0); // TODO: make shadow black somehow shellMesh.render(shader, GL10.GL_TRIANGLES); } shader.end(); Gdx.gl.glDisable(GL10.GL_BLEND); So my questions are: a) What is the proper way to produce a Matrix4 to pass to openGL which would render the shadows for my objects? b) I am supposed to use another fragment shader for the shadows which would paint them in semi-transparent grey, correct? c) The limitation of this simplistic approach is that whenever there is some object on the ground (it is not flat) the shadows will not be drawn, correct? d) Do I need to add something very small to the y (up) coordinate to avoid z-fighting with ground textures? Or is the fact they will be semi-transparent enough to resolve that problem?

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• GPU hung when switching graphic card

  - by Lie Ryan

  I have a laptop (Dell Inspiron N4110) with a switchable graphic. $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 01:00.0 VGA compatible controller: ATI Technologies Inc NI Whistler [AMD Radeon HD 6600M Series] (rev ff) Normally, my laptop starts with both graphic cards enabled, which caused the laptop to turn very hot and the fan to become very noisy. I have been using a small script to disable the Radeon card. For some time, I'm quite happy with this arrangement. However, I have been having some issues with the Intel card (IGD), the Intel card often randomly hang when running OpenGL apps; and so I want to give the Radeon card (DIS) another chance. I have never been able to switch to the Radeon card, but recently, I found out that if I do a "delayed switching" (DDIS): # echo "DDIS" > /sys/kernel/debug/vgaswitcheroo/switch root@lieryan-dell-ubuntu:/sys/kernel/debug/vgaswitcheroo# cat switch 0:IGD:+:Pwr:0000:00:02.0 1:DIS: :Pwr:0000:01:00.0 then I logoff (i.e. to restart X), the screen switch to pseudo-tty and then it stuck there freezing. At this situation, mouse and keyboard stops working so I can't switch to another ptty. I tried ssh-ing from another computer to salvage logs (dmesg at that point) and whatnot; I found out that when freezing, the active graphic card is the AMD card: -- this is from ssh -- # cat switch 0:IGD: :Off:0000:00:02.0 1:DIS:+:Pwr:0000:01:00.0 but the GPU is apparently hung, looking at dmesg gives: ... [ 1411.649974] vga_switcheroo: client 0 refused switch [ 1411.649985] vga_switcheroo: setting delayed switch to client 1 [ 1423.911759] vga_switcheroo: processing delayed switch to 1 [ 1424.006564] fbcon: Remapping primary device, fb1, to tty 1-63 [ 1424.006799] i915: switched off [ 1424.840351] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id [ 1425.718088] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id [ 1426.622377] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id [ 1427.355683] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id [ 1428.193549] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id ... the invalid framebuffer id error is repeated for many times over ... I were able to successfully recover by switching back to the Intel card and restarting X from ssh; indicating that only the Radeon card has problems switching. System info: $ uname -a Linux lieryan-dell-ubuntu 3.0.0-14-generic #23-Ubuntu SMP Mon Nov 21 20:28:43 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 11.10 Release: 11.10 Codename: oneiric The laptop also do not have the option to set graphic card at BIOS and the proprietary driver, fglrx, also have never worked; when I installed it through jockey ("Additional Drivers"), glxinfo showed that it still being rendered by Mesa, the /sys/kernel/debug/vgaswitcheroo directory has gone missing, and the driver crashes with a traceback if I use xorg.conf to tell X to use fglrx. Anyone had any idea if it is possible to use this AMD card either with the radeon or the fglrx driver? logs: dmesg

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• Oracle Excellence Awards 2012

  - by A&C Redaktion

  Spezialisierte Partner können sich ab sofort bis 29. Juni als „Specialized Partner of the Year“ bewerben. Damit honoriert Oracle diejenigen OPN Partner in EMEA, die sich mithilfe der Spezialisierung besonders ausgezeichnet haben, sei es durch einen hohen Mehrwert für deren Endkunden oder innovativen Lösungen und Services. Voraussetzung für eine Bewerbung ist mindestens eine abgeschlossene Spezialisierung in diesen sieben Kategorien: Specialized Partner of the Year: Database Specialized Partner of the Year: Applications Specialized Partner of the Year: Middleware Specialized Partner of the Year: Industry Specialized Partner of the Year: Oracle Accelerate Specialized Partner of the Year: Servers and Storage Systems Specialized Partner of the Year: Oracle on Oracle Der Gewinner eines “Specialized Partner of the Year” EMEA Awards erhält 5.000 US-Dollar MDF und vielfältige Möglichkeiten, sich in Szene zu setzen. Wie auch im letzten Jahr wird der Award wieder auf der Oracle OpenWorld in San Francisco überreicht. Interviews, Videos, Werbung, Berichte im Oracle Magazine und ein kostenloser Konferenzpass sind natürlich inklusive. Wie immer, gilt die Bewerbung für den EMEA-Award gleichzeitig als Bewerbung für den deutschen Partner-Award 2012, der auf dem Oracle Partner Day (im Herbst nach der OpenWorld) verliehen wird. Normal 0 21 false false false DE X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Die Nominierung Ihres erfolgreichen Projektes muss diesmal hier auf Englisch eingereicht werden, da eine internationale Jury entscheidet. Beschreiben Sie Ihr Projekt so ausführlich wie möglich, damit sich die Juroren ein gutes Bild Ihrer Leistungen und Services machen können. Wenn Sie hierbei Unterstützung benötigen, fragen Sie einfach Ihren Channel Manager. Denn: Je aussagekräftiger Ihre Unterlagen sind, desto höher ist Ihre Chance zu gewinnen! Alle Informationen zu den diesjährigen Awards finden Sie auf der Oracle Excellence Awards Website. Wir drücken Ihnen die Daumen!

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• Oracle Excellence Awards 2012

  - by A&C Redaktion

  Spezialisierte Partner können sich ab sofort bis 29. Juni als „Specialized Partner of the Year“ bewerben. Damit honoriert Oracle diejenigen OPN Partner in EMEA, die sich mithilfe der Spezialisierung besonders ausgezeichnet haben, sei es durch einen hohen Mehrwert für deren Endkunden oder innovativen Lösungen und Services. Voraussetzung für eine Bewerbung ist mindestens eine abgeschlossene Spezialisierung in diesen sieben Kategorien: Specialized Partner of the Year: Database Specialized Partner of the Year: Applications Specialized Partner of the Year: Middleware Specialized Partner of the Year: Industry Specialized Partner of the Year: Oracle Accelerate Specialized Partner of the Year: Servers and Storage Systems Specialized Partner of the Year: Oracle on Oracle Der Gewinner eines “Specialized Partner of the Year” EMEA Awards erhält 5.000 US-Dollar MDF und vielfältige Möglichkeiten, sich in Szene zu setzen. Wie auch im letzten Jahr wird der Award wieder auf der Oracle OpenWorld in San Francisco überreicht. Interviews, Videos, Werbung, Berichte im Oracle Magazine und ein kostenloser Konferenzpass sind natürlich inklusive. Wie immer, gilt die Bewerbung für den EMEA-Award gleichzeitig als Bewerbung für den deutschen Partner-Award 2012, der auf dem Oracle Partner Day (im Herbst nach der OpenWorld) verliehen wird. Normal 0 21 false false false DE X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Die Nominierung Ihres erfolgreichen Projektes muss diesmal hier auf Englisch eingereicht werden, da eine internationale Jury entscheidet. Beschreiben Sie Ihr Projekt so ausführlich wie möglich, damit sich die Juroren ein gutes Bild Ihrer Leistungen und Services machen können. Wenn Sie hierbei Unterstützung benötigen, fragen Sie einfach Ihren Channel Manager. Denn: Je aussagekräftiger Ihre Unterlagen sind, desto höher ist Ihre Chance zu gewinnen! Alle Informationen zu den diesjährigen Awards finden Sie auf der Oracle Excellence Awards Website. Wir drücken Ihnen die Daumen!

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• 3D terrain map with Hexagon Grids (XNA)

  - by Rob

  I'm working on a hobby project (I'm a web/backend developer by day) and I want to create a 3D Tile (terrain) engine. I'm using XNA, but I can use MonoGame, OpenGL, or straight DirectX, so the answer does not have to be XNA specific. I'm more looking for some high level advice on how to approach this problem. I know about creating height maps and such, there are thousands of references out there on the net for that, this is a bit more specific. I'm more concerned with is the approach to get a 3D hexagon tile grid out of my terrain (since the terrain, and all 3d objects, are basically triangles). The first approach I thought about is to basically draw the triangles on the screen in the following order (blue numbers) to give me the triangles for terrain (black triangles) and then make hexes out of the triangles (red hex). http://screencast.com/t/ebrH2g5V This approach seems complicated to me since i'm basically having to draw 4 different types of triangles. The next approach I thought of was to use the existing triangles like I did for a square grid and get my hexes from 6 triangles as follows http://screencast.com/t/w9b7qKzVJtb8 This seems like the easier approach to me since there are only 2 types of triangles (i would have to play with the heights and widths to get a "perfect" hexagon, but the idea is the same. So I'm looking for: 1) Any suggestions on which approach I should take, and why. 2) How would I translate mouse position to a hexagon grid position (especially when moving the camera around), for example in the second image if the mouse pointer were the green circle, how would I determine to highlight that hexagon and then translating that into grid coordinates (assuming it is 0,0)? 3) Any references, articles, books, etc - to get me going in the right direction. Note: I've done hex grid's and mouse-grid coordinate conversion before in 2d. looking for some pointers on how to do the same in 3d. The result I would like to achieve is something similar to the following: http :// www. youtube .com / watch?v=Ri92YkyC3fw (sorry about the youtube link, but it will only let me post 2 links in this post... same rep problem i mention below...) Thanks for any help! P.S. Sorry for not posting the images inline, I apparently don't have enough rep on this stack exchange site.

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• Is there a pedagogical game engine?

  - by K.G.

  I'm looking for a book, website, or other resource that gives modern 3D game engines the same treatment as Operating Systems: Design and Implementation gave operating systems. I have read Jason Gregory's Game Engine Architecture, which I enjoyed. However, by intent the author treated components of the architecture as atomic units, whereas what I'm interested in is the plumbing between those units that makes a coherent whole out of ideally loosely coupled parts. In books such as these, one usually reads that "that's academic," but that's the point! I have also read Julian Gold's Object-oriented Game Development, which likewise was good, but I feel is beginning to show its age. Since even mobile platforms these days are multicore and have fast video memory, those kinds of things (concurrency, display item buffering) would ideally be covered. There are other resources, such as the Doom 3 source code, which is highly instructive for its being a shipped product. The problem with those is as follows: float Q_rsqrt( float number ) { long i; float x2, y; const float threehalfs = 1.5F; x2 = number * 0.5F; y = number; i = * ( long * ) &y; // evil floating point bit level hacking i = 0x5f3759df - ( i >> 1 ); // what the f***? y = * ( float * ) &i; y = y * ( threehalfs - ( x2 * y * y ) ); // 1st iteration // y = y * ( threehalfs - ( x2 * y * y ) ); // 2nd iteration, this can be removed return y; } To wit, while brilliant, this kind of source requires more enlightenment than I can usually muster upon first read. In summary, here's my white whale: For an adult reader with experience in programming. I wish I could save all the trees killed by every. Single. Game Programming book ever devoting the first two chapters to "Now just what is a variable anyway?" In C or C++, very preferably C++. Languages that are more concise are fantastic for teaching, except for when what you want to learn is how to cope with a verbose language. There is also the benefit of the guardrails that C++ doesn't provide, such as garbage collection. Platform agnostic. I'm sincerely afraid that this book is out there and it's Visual C++/DirectX oriented. I'm a Linux guy, and I'd do what it takes, but I would very much like to be able to use OpenGL. Thanks for everything! Before anyone gets on my case about it, Fast inverse square root was from Quake III Arena, not Doom 3!

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• Are these non-standard applications of rendering practical in games?

  - by maul

  I've recently got into 3D and I came up with a few different "tricky" rendering techniques. Unfortunately I don't have the time to work on this myself, but I'd like to know if these are known methods and if they can be used in practice. Hybrid rendering Now I know that ray-tracing is still not fast enough for real-time rendering, at least on home computers. I also know that hybrid rendering (a combination of rasterization and ray-tracing) is a well known theory. However I had the following idea: one could separate a scene into "important" and "not important" objects. First you render the "not important" objects using traditional rasterization. In this pass you also render the "important" objects using a special shader that simply marks these parts on the image using a special color, or some stencil/depth buffer trickery. Then in the second pass you read back the results of the first pass and start ray tracing, but only from the pixels that were marked by the "important" object's shader. This would allow you to only ray-trace exactly what you need to. Could this be fast enough for real-time effects? Rendered physics I'm specifically talking about bullet physics - intersection of a very small object (point/bullet) that travels across a straight line with other, relatively slow-moving, fairly constant objects. More specifically: hit detection. My idea is that you could render the scene from the point of view of the gun (or the bullet). Every object in the scene would draw a different color. You only need to render a 1x1 pixel window - the center of the screen (again, from the gun's point of view). Then you simply check that central pixel and the color tells you what you hit. This is pixel-perfect hit detection based on the graphical representation of objects, which is not common in games. Afaik traditional OpenGL "picking" is a similar method. This could be extended in a few ways: For larger (non-bullet) objects you render a larger portion of the screen. If you put a special-colored plane in the middle of the scene (exactly where the bullet will be after the current frame) you get a method that works as the traditional slow-moving iterative physics test as well. You could simulate objects that the bullet can pass through (with decreased velocity) using alpha blending or some similar trick. So are these techniques in use anywhere, and/or are they practical at all?

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• vga_switcheroo and Intel HD 3000 on Ubuntu 12.04

  - by Ikalou

  I'm trying to get vga_switcheroo to enable my integrated Intel HD 3000 instead of my ATI card. My problem is that there is no vgaswitcheroo directory in /sys/kernel/debug/ on my system. > grep -i switcheroo /boot/config-3.2.0-26-generic CONFIG_VGA_SWITCHEROO=y And yet: > sudo ls /sys/kernel/debug/ acpi bdi bluetooth dri extfrag gpio ieee80211 kprobes mce mmc0 regmap regulator sched_features suspend_stats tracing usb wakeup_sources x86 I am NOT using the fglrx driver. Here is the output of lspci; glxinfo | grep renderer: 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09) 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04) 00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04) 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04) 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4) 00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b4) 00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b4) 00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b4) 00:1c.7 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 8 (rev b4) 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04) 00:1f.0 ISA bridge: Intel Corporation QM67 Express Chipset Family LPC Controller (rev 04) 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 04) 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Seymour [Radeon HD 6400M Series] 01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Caicos HDMI Audio [Radeon HD 6400 Series] 24:00.0 FireWire (IEEE 1394): JMicron Technology Corp. IEEE 1394 Host Controller (rev 30) 24:00.1 System peripheral: JMicron Technology Corp. SD/MMC Host Controller (rev 30) 24:00.2 SD Host controller: JMicron Technology Corp. Standard SD Host Controller (rev 30) 25:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 (rev 34) 26:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04) OpenGL renderer string: Gallium 0.4 on AMD CAICOS Both xserver-xorg-video-intel and xserver-xorg-video-radeon packages are installed. I know there are tons of posts about hybrid-graphics already but I couldn't quite find a solution to my problem. Does anyone know why is /sys/kernel/debug/vgaswitcheroo not showing?

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• Is Ubuntu recognizing and/or using my NVIDIA graphics card?

  - by user212860

  This is my first post here, and I'm pretty new to Ubuntu/Linux. I currently have no other OS except for Ubuntu 13.10. (I used to have Win7 until i got a new terabyte hard drive). My current PC build, if any of this helps: CPU: Intel i5 quad-core Graphics: NVIDIA GeForce GTX 650 RAM: 8 GB HDD: 1 TB SATA 3 Motherboard: MSi Z77 A-G41 OS Ubuntu 13.10 So I recently installed Ubuntu 13.10 and put Steam on it, and I'm seeing that my games run a lot slower than they did when I had Win7. I figured it was a graphics problem, so I checked System Settings Details Overview. It says in "Graphics" that I have "Gallium 0.4 on NVE7" (don't really know what that is). Does this mean that Ubuntu is not using my graphics card? In System Settings Software & Updates Additional Drivers, it clearly shows like this: NVIDIA Corporation: GK107 [GeForce GTX 650] -This device is using an alternative driver (And then it shows a list of drivers that I can switch back and forth to) So this is a bit confusing. In Software and Updates, it clearly shows that I have my NVIDIA card installed, and that I have a driver selected for it. But in System Settings, it shows I have some Gallium 0.4 thing. I had done a bit of research, and ended up typing command: "lspci|grep VGA" in the Terminal. It showed this in response: VGA compatible controller: NVIDIA Corporation GK107 [GeForce GTX 650] (rev a1) The Terminal seems to recognize my graphics card. What it looks like to me, is that I don't have the proper driver, and I might be using my CPU's integrated graphics. When I switch around which driver I am using in that list, it still does not see my card in System Settings. Some of the drivers in the list give me some sort of OpenGL error when I try to run a game. It might just be that my games are running slow because the game developers have not optimized it for Ubuntu that well. However, that still doesn't take away from the fact that System Settings is not showing my NVIDIA card. TL;DR Version: How do I know if my video card is being recognized/used? If my video card is not being used, what is the best way fix that? Please make your answers easy to understand. I do not mind wordy responses, as long as I can follow what you're saying. Any help would be greatly appreciated! Thanks, Jabber5

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• IPC in C under linux

  - by poly

  I'm building a messaging solution with the followingsetup: all the messages are saved on a DB, two or more reader processes will read from this DB and send data to other process(es) which will send it over the network. My approach is depicted below, The following have 4 sender process with 4 fifos, and 2 readers with 2 fifos reader0 ? read data from DB reader1 ? read data from DB sending part network_handler0 ? network_handler_fifo0 ? reader0 network_handler1 ? network_handler_fifo1 ? reader1 network_handler2 ? network_handler_fifo2 ? reader0 network_handler3 ? network_handler_fifo3 ? reader1 receiving part network_handler0 ? reader_fifo0 ? reader0 ? write to DB network_handler1 ? reader_fifo1 ? reader1 ? write to DB network_handler2 ? reader_fifo0 ? reader0 ? write to DB network_handler3 ? reader_fifo1 ? reader1 ? write to DB I have few problem with this setup, and please note that the number of processes could be more than that based on the environment, so I could make it 20 readers and 10 network_handlers or it it could as shown above. The size of the buffer is 64K and the message size is 200k, is this small enough to make the write/read to/from fifo atomic? How can make the processes aware of each other, so for example, reader 0 writes to network_handler_fifo0 and network_handler_fifo2, how can I make it start writing on other fifo if the current ones are full or their network_handlers are dea d I thought about making the reader process writing more general in writing, so for example it writes to all network fifos using lock mechanism and stop writing on the one that its process dead, I didn't use it as lock mechanism could slow thing down. BTW, each network_handler is an SCTP association, so network_handler0 is association 0, network_handler1 is association 1 and so on. Any idea is appreciated. I mean even if I have to change the setup above.

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• Recommended learning path?

  - by stairmast0r

  First, my current standing: I know C++ at an.. advanced beginner level? I've gone through a book, I know the syntax well enough, I know a fair amount of standard library functions, and I've programmed some simple console stuff with it. I'd probably be able to program more with it if I knew how to structure a program, but I just can't seem to wrap my head around the whole concept of structuring something remotely complex. I've messed around with Java for a day or two, and the syntax was extremely easy to get the hang of, except that I didn't really know any functions. I'm plenty willing to learn, and to work hard to do so, but I don't really know where to go from here. Now, at the risk of sounding cliche, what I'd like to become is someone like the great three of id; Carmack, Romero, and Abrash. To be considered a genius. I believe anything can be learned, and nothing mentally limits anyone except lack of desire to learn. But I don't know how to learn this. They learned by doing, and making do with what resources they had. On the other hand, I have access to almost any books I want, access to the internet, and access to a more than capable computer and software. Should I learn more languages? Assembly? LISP? BASIC? Haskell? Should I dive straight into advanced topics like OpenGL? Or should I wait until I feel I've come closer to mastering the simpler things, like console programs, first? Should I follow tutorials? Should I follow books? Should I just dive into writing something and follow a reference manual as I go? What order should I do all this in? How should I do it? I want to completely master this; to be considered a genius. The most perfect career I can imagine is to start the next id. I have the drive to do it, I just don't know where to begin...

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• Optimising movement on hex grid

  - by Mloren

  I am making a turn based hex-grid game. The player selects units and moves them across the hex grid. Each tile in the grid is of a particular terrain type (eg desert, hills, mountains, etc) and each unit type has different abilities when it comes to moving over the terrain (e.g. some can move over mountains easily, some with difficulty and some not at all). Each unit has a movement value and each tile takes a certain amount of movement based on its terrain type and the unit type. E.g it costs a tank 1 to move over desert, 4 over swamp and cant move at all over mountains. Where as a flying unit moves over everything at a cost of 1. The issue I have is that when a unit is selected, I want to highlight an area around it showing where it can move, this means working out all the possible paths through the surrounding hexes, how much movement each path will take and lighting up the tiles based on that information. I got this working with a recursive function and found it took too long to calculate, I moved the function into a thread so that it didn't block the game but still it takes around 2 seconds for the thread to calculate the moveable area for a unit with a move of 8. Its over a million recursions which obviously is problematic. I'm wondering if anyone has an clever ideas on how I can optimize this problem. Here's the recursive function I'm currently using (its C# btw): private void CalcMoveGridRecursive(int nCenterIndex, int nMoveRemaining) { //List of the 6 tiles adjacent to the center tile int[] anAdjacentTiles = m_ThreadData.m_aHexData[nCenterIndex].m_anAdjacentTiles; foreach(int tileIndex in anAdjacentTiles) { //make sure this adjacent tile exists if(tileIndex == -1) continue; //How much would it cost the unit to move onto this adjacent tile int nMoveCost = m_ThreadData.m_anTerrainMoveCost[(int)m_ThreadData.m_aHexData[tileIndex].m_eTileType]; if(nMoveCost != -1 && nMoveCost <= nMoveRemaining) { //Make sure the adjacent tile isnt already in our list. if(!m_ThreadData.m_lPassableTiles.Contains(tileIndex)) m_ThreadData.m_lPassableTiles.Add(tileIndex); //Now check the 6 tiles surrounding the adjacent tile we just checked (it becomes the new center). CalcMoveGridRecursive(tileIndex, nMoveRemaining - nMoveCost); } } } At the end of the recursion, m_lPassableTiles contains a list of the indexes of all the tiles that the unit can possibly reach and they are made to glow. This all works, it just takes too long. Does anyone know a better approach to this?

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• Why is firefox 4 not HW accelerated?

  - by acidzombie24

  At first i thought it was my computer but then i tried chrome. Why isnt firefox not hardware accelerated? The first screenshot shows chrome at 23% usage. The 2nd shows 59%. I have 2 cpus which is why it isnt 100% usage. The game pictured is biolab Heres the text for about:support Application Basics Name Firefox Version 4.0 User Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0 Profile Directory Open Containing Folder Enabled Plugins about:plugins Build Configuration about:buildconfig Extensions Name Version Enabled ID Modified Preferences Name Value accessibility.typeaheadfind.flashBar 0 browser.places.importBookmarksHTML false browser.places.smartBookmarksVersion 2 browser.startup.homepage_override.buildID 20110303194838 browser.startup.homepage_override.mstone rv:2.0 extensions.lastAppVersion 4.0 gfx.font_rendering.directwrite.enabled true network.cookie.prefsMigrated true places.history.expiration.transient_current_max_pages 127602 privacy.sanitize.migrateFx3Prefs true Graphics Adapter Description Mobile Intel(R) 4 Series Express Chipset Family Vendor ID 8086 Device ID 2a42 Adapter RAM Unknown Adapter Drivers igdumd64 igd10umd64 igdumdx32 igd10umd32 Driver Version 8.15.10.2202 Driver Date 8-25-2010 Direct2D Enabled true DirectWrite Enabled true (6.1.7600.16385, font cache n/a) WebGL Renderer Google Inc. -- ANGLE -- OpenGL ES 2.0 (ANGLE 0.0.0.541) GPU Accelerated Windows 1/1 Direct3D 10

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• Home Networking Questions

  - by Eddie Parker

  Hello: I'm looking to wire my home with CAT-X (where X is probably going to be CAT-6, unless someone can convince me differently. ;) ). I'm seeking advice on what equipment I'll need for the job, and any things I should watch out for. It's a two story half-duplex I'll be wiring, roughly about 1800 sq ft. Here's what I believe I need so far: Bulk CAT-6 Ethernet cabling CM Rated Gigabit switch(es?) Patch panel Equipment for cutting, terminating wire, fishing through walls, etc Wall outlet covers, etc. Questions I have: Does it matter the MHz rating on the Ethernet cable? If so, why? I have two gigabit switches currently, an 8-port and a 5-port. Should I buy one massive switch to cover all the connections I need, or should I just chain the two together and buy a switch for however many other connections I need? Do I really need a patch panel? I understand it keeps the cables looking cleaner than coming out of a hole in the wall, but is there some other product I can use, perhaps combining a switch with a patch panel or some such? Ideally I'll have all this running out of a relatively small closet, so the less components (or smaller) the better. Any advice, links, or suggested product to use/avoid would be appreciated!

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• Metro apps crash on startup, driver or permissions issue?

  - by Vee

  After installing Win8 x64 RC, Metro apps worked correctly, but desktop OpenGL apps were slow and unresponsive. I installed the latest Win8 nVidia drivers, and the OpenGL apps started working correctly. At the same time, because of annoying permission messages, I changed the C:\ drive and all its files ownerships to my user, and gave it full permission. I restarted my pc after installing the drivers, and now Metro apps only show the splash screen, then crash. I tried installing other versions of the nVidia drivers, with the same result. My GPU is a GeForce GTX275. Is this a known problem with nVidia drivers? Or maybe changing the ownership of C:\ is the real problem? Thank you. More information (after looking in the event viewer) I've managed to find the problem and the error in the Event Viewer. I still cannot solve it. Here's the information I found by opening the Mail app and letting it crash: Log Name: Microsoft-Windows-TWinUI/Operational Source: Microsoft-Windows-Immersive-Shell Date: 07/06/2012 15.54.17 Event ID: 5961 Task Category: (5961) Level: Error Keywords: User: VEE-PC\Vittorio Computer: vee-pc Description: Activation of the app microsoft.windowscommunicationsapps_8wekyb3d8bbwe!Microsoft.WindowsLive.Mail for the Windows.Launch contract failed with error: The app didn't start.. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Microsoft-Windows-Immersive-Shell" Guid="{315A8872-923E-4EA2-9889-33CD4754BF64}" /> <EventID>5961</EventID> <Version>0</Version> <Level>2</Level> <Task>5961</Task> <Opcode>0</Opcode> <Keywords>0x4000000000000000</Keywords> <TimeCreated SystemTime="2012-06-07T13:54:17.472416600Z" /> <EventRecordID>6524</EventRecordID> <Correlation /> <Execution ProcessID="3008" ThreadID="6756" /> <Channel>Microsoft-Windows-TWinUI/Operational</Channel> <Computer>vee-pc</Computer> <Security UserID="S-1-5-21-2753614643-3522538917-4071044258-1001" /> </System> <EventData> <Data Name="AppId">microsoft.windowscommunicationsapps_8wekyb3d8bbwe!Microsoft.WindowsLive.Mail</Data> <Data Name="ContractId">Windows.Launch</Data> <Data Name="ErrorCode">-2144927141</Data> </EventData> </Event> Found other stuff, this is another error that appears when opening a Metro app: Log Name: Application Source: ESENT Date: 07/06/2012 16.01.00 Event ID: 490 Task Category: General Level: Error Keywords: Classic User: N/A Computer: vee-pc Description: svchost (1376) SRUJet: An attempt to open the file "C:\Windows\system32\SRU\SRU.log" for read / write access failed with system error 5 (0x00000005): "Access is denied. ". The open file operation will fail with error -1032 (0xfffffbf8). Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="ESENT" /> <EventID Qualifiers="0">490</EventID> <Level>2</Level> <Task>1</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2012-06-07T14:01:00.000000000Z" /> <EventRecordID>11854</EventRecordID> <Channel>Application</Channel> <Computer>vee-pc</Computer> <Security /> </System> <EventData> <Data>svchost</Data> <Data>1376</Data> <Data>SRUJet: </Data> <Data>C:\Windows\system32\SRU\SRU.log</Data> <Data>-1032 (0xfffffbf8)</Data> <Data>5 (0x00000005)</Data> <Data>Access is denied. </Data> </EventData> </Event> After changing permissions again (adding Everyone and Creator Owner to System32), the "access denied to sru.log" error disappears, but this one appears in its place: Log Name: Application Source: Microsoft-Windows-Immersive-Shell Date: 07/06/2012 16.16.34 Event ID: 2486 Task Category: (2414) Level: Error Keywords: (64),Process Lifetime Manager User: VEE-PC\Vittorio Computer: vee-pc Description: App microsoft.windowscommunicationsapps_8wekyb3d8bbwe!Microsoft.WindowsLive.Mail did not launch within its allotted time. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Microsoft-Windows-Immersive-Shell" Guid="{315A8872-923E-4EA2-9889-33CD4754BF64}" /> <EventID>2486</EventID> <Version>0</Version> <Level>2</Level> <Task>2414</Task> <Opcode>0</Opcode> <Keywords>0x2000000000000042</Keywords> <TimeCreated SystemTime="2012-06-07T14:16:34.616499600Z" /> <EventRecordID>11916</EventRecordID> <Correlation /> <Execution ProcessID="3008" ThreadID="6996" /> <Channel>Application</Channel> <Computer>vee-pc</Computer> <Security UserID="S-1-5-21-2753614643-3522538917-4071044258-1001" /> </System> <EventData> <Data Name="ApplicationId">microsoft.windowscommunicationsapps_8wekyb3d8bbwe!Microsoft.WindowsLive.Mail</Data> </EventData> </Event> Now I'm stuck. It tells me "Activation of app microsoft.windowscommunicationsapps_8wekyb3d8bbwe!Microsoft.WindowsLive.Mail failed with error: The app didn't start. See the Microsoft-Windows-TWinUI/Operational log for additional information." but I can't find the Microsoft-Windows-TWinUI/Operational log. I'm starting a bounty. I found the TWinUI/Operational log. It only tells me: Log Name: Microsoft-Windows-TWinUI/Operational Source: Microsoft-Windows-Immersive-Shell Date: 07/06/2012 16.28.57 Event ID: 5961 Task Category: (5961) Level: Error Keywords: User: VEE-PC\Vittorio Computer: vee-pc Description: Activation of the app microsoft.windowscommunicationsapps_8wekyb3d8bbwe!Microsoft.WindowsLive.Mail for the Windows.BackgroundTasks contract failed with error: The app didn't start.. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Microsoft-Windows-Immersive-Shell" Guid="{315A8872-923E-4EA2-9889-33CD4754BF64}" /> <EventID>5961</EventID> <Version>0</Version> <Level>2</Level> <Task>5961</Task> <Opcode>0</Opcode> <Keywords>0x4000000000000000</Keywords> <TimeCreated SystemTime="2012-06-07T14:28:57.238140800Z" /> <EventRecordID>6536</EventRecordID> <Correlation /> <Execution ProcessID="3008" ThreadID="2624" /> <Channel>Microsoft-Windows-TWinUI/Operational</Channel> <Computer>vee-pc</Computer> <Security UserID="S-1-5-21-2753614643-3522538917-4071044258-1001" /> </System> <EventData> <Data Name="AppId">microsoft.windowscommunicationsapps_8wekyb3d8bbwe!Microsoft.WindowsLive.Mail</Data> <Data Name="ContractId">Windows.BackgroundTasks</Data> <Data Name="ErrorCode">-2144927141</Data> </EventData> </Event> I need to go deeper. I found a forum thread that told me to look for "DCOM" errors. I found this one related to the app crash "The server Microsoft.WindowsLive.Mail.wwa did not register with DCOM within the required timeout." Log Name: System Source: Microsoft-Windows-DistributedCOM Date: 07/06/2012 16.46.45 Event ID: 10010 Task Category: None Level: Error Keywords: Classic User: VEE-PC\Vittorio Computer: vee-pc Description: The server Microsoft.WindowsLive.Mail.wwa did not register with DCOM within the required timeout. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Microsoft-Windows-DistributedCOM" Guid="{1B562E86-B7AA-4131-BADC-B6F3A001407E}" EventSourceName="DCOM" /> <EventID Qualifiers="0">10010</EventID> <Version>0</Version> <Level>2</Level> <Task>0</Task> <Opcode>0</Opcode> <Keywords>0x8080000000000000</Keywords> <TimeCreated SystemTime="2012-06-07T14:46:45.586943800Z" /> <EventRecordID>2763</EventRecordID> <Correlation /> <Execution ProcessID="804" ThreadID="2364" /> <Channel>System</Channel> <Computer>vee-pc</Computer> <Security UserID="S-1-5-21-2753614643-3522538917-4071044258-1001" /> </System> <EventData> <Data Name="param1">Microsoft.WindowsLive.Mail.wwa</Data> </EventData> </Event>

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• exim4 - disable autoreplies about "SMTP error from remote mail server after RCPT"

  - by osgx

  Hello I have a setup of exim4 on domain1 in front of other server, domain2 (with sendmail). Second server have no direct access to internet, so domain1 is MX for domain2. And domain2 is set as hubbed_host in the exim4 on domain1. When spammer sends message for no_such_user@domain2, its sendmail do a reject: 550 5.1.1 <no_such_user@domain2>... User unknown Then, exim4 at domain1 do an auto-reply like this: This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: no_such_user@domain2 SMTP error from remote mail server after RCPT TO:<no_such_user@domain2>: host 10.0.0.1 [10.0.0.1]: 550 5.1.1 <no_such_user@domain2>... User unknown The spammers uses fake "from" field, and such generated messages are frozen by exim for a long time. How can I disable some or all autoreplies from exim4? Ideally, I want a filter, if message was not delivered with error "User unknown" than don't generate any autoreply from mailer-daemon. Thanks!

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• Strange performance issue with Dell R7610 and LSI 2208 RAID controller

  - by GregC

  Connecting controller to any of the three PCIe x16 slots yield choppy read performance around 750 MB/sec Lowly PCIe x4 slot yields steady 1.2 GB/sec read Given same files, same Windows Server 2008 R2 OS, same RAID6 24-disk Seagate ES.2 3TB array on LSI 9286-8e, same Dell R7610 Precision Workstation with A03 BIOS, same W5000 graphics card (no other cards), same settings etc. I see super-low CPU utilization in both cases. SiSoft Sandra reports x8 at 5GT/sec in x16 slot, and x4 at 5GT/sec in x4 slot, as expected. I'd like to be able to rely on the sheer speed of x16 slots. What gives? What can I try? Any ideas? Please assist Cross-posted from http://en.community.dell.com/support-forums/desktop/f/3514/t/19526990.aspx Follow-up information We did some more performance testing with reading from 8 SSDs, connected directly (without an expander chip). This means that both SAS cables were utilized. We saw nearly double performance, but it varied from run to run: {2.0, 1.8, 1.6, and 1.4 GB/sec were observed, then performance jumped back up to 2.0}. The SSD RAID0 tests were conducted in a x16 PCIe slot, all other variables kept the same. It seems to me that we were getting double the performance of HDD-based RAID6 array. Just for reference: maximum possible read burst speed over single channel of SAS 6Gb/sec is 570 MB/sec due to 8b/10b encoding and protocol limitations (SAS cable provides four such channels).

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• How to diagnose frequent segfaults

  - by Andreas Gohr

  My server is logging frequent segmentation faults to /var/log/kern.log in different tools. So far I've seen them in Perl, PHP and rsync. All installed software is up-to-date Debian packages. Here's an exerpt from the log file: Mar 2 01:07:54 gaz kernel: [ 5316.246303] imapsync[4533]: segfault at 8b ip 00007fb448c98fe6 sp 00007ffff571dd68 error 4 in libperl.so.5.10.1[7fb448bd7000+164000] Mar 2 01:17:42 gaz kernel: [ 5904.354307] php5-cgi[4441]: segfault at 2bb3dc8 ip 0000000002bb3dc8 sp 00007fffbeeaae48 error 15 Mar 2 02:54:05 gaz kernel: [11687.922316] php5-cgi[4495]: segfault at 2d7acf9 ip 0000000002d7acf9 sp 00007fff60c6eb18 error 15 Mar 2 10:50:08 gaz kernel: [40250.390322] BUG: unable to handle kernel paging request at 00000000024b03f0 Mar 2 10:50:08 gaz kernel: [40250.390341] IP: [<00000000024b03f0>] 0x24b03f0 Mar 2 10:50:08 gaz kernel: [40250.390353] PGD 208c71067 PUD 21c811067 PMD 209329067 PTE 8000000211c88067 Mar 2 10:50:08 gaz kernel: [40250.390365] Oops: 0011 [#1] SMP Mar 2 10:50:08 gaz kernel: [40250.390373] last sysfs file: /sys/devices/pci0000:00/0000:00:12.0/host4/target4:0:0/4:0:0:0/block/sdb/stat Mar 2 10:50:08 gaz kernel: [40250.390386] CPU 1 Mar 2 10:50:08 gaz kernel: [40250.390392] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative xt_recent xt_tcpudp iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ ipv4 ip6table_filter ip6_tables xt_DSCP xt_TCPMSS ipt_LOG ipt_REJECT iptable_mangle iptable_filter xt_multiport xt_state xt_limit xt_conntrack nf_conntrack_ftp nf_conntrack ip_tables x_tables loop snd _hda_codec_atihdmi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm radeon snd_timer ttm snd drm_kms_helper soundcore drm snd_page_alloc i2c_algo_bit shpchp i2c_piix4 edac_core pcspkr k8temp evdev edac_m ce_amd pci_hotplug i2c_core button ext3 jbd mbcache dm_mod powernow_k8 aacraid 3w_9xxx 3w_xxxx raid10 raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid1 raid0 md_mod sata_nv sata_sil sata_via sd_mod crc_t10dif ata_generic ahci pata_atiixp ohci_hcd libata r8169 mii thermal ehci_hcd processor thermal_sys scsi_mod usbcore nls_base [last unloaded: scsi_wait_scan] Mar 2 10:50:08 gaz kernel: [40250.390566] Pid: 11482, comm: munin-limits Not tainted 2.6.32-5-amd64 #1 MS-7368 Mar 2 10:50:08 gaz kernel: [40250.390576] RIP: 0010:[<00000000024b03f0>] [<00000000024b03f0>] 0x24b03f0 Mar 2 10:50:08 gaz kernel: [40250.390586] RSP: 0018:ffff88021cc8dec0 EFLAGS: 00010286 Mar 2 10:50:08 gaz kernel: [40250.390593] RAX: 000000001ddc1000 RBX: 0000000000000010 RCX: ffffffff810f9904 Mar 2 10:50:08 gaz kernel: [40250.390600] RDX: 0000000000000000 RSI: ffffea0007688200 RDI: 0000000000000286 Mar 2 10:50:08 gaz kernel: [40250.390608] RBP: 00000000ffffffea R08: 0000000000000025 R09: 7865542f30312e35 Mar 2 10:50:08 gaz kernel: [40250.390615] R10: 000000d01cc8ddf8 R11: 0000000000000246 R12: ffff88021cc8def8 Mar 2 10:50:08 gaz kernel: [40250.390622] R13: 0000000002295010 R14: 00000000022c9db0 R15: 0000000002488d78 Mar 2 10:50:08 gaz kernel: [40250.390630] FS: 00007f3b3c8b2700(0000) GS:ffff880008d00000(0000) knlGS:0000000000000000 Mar 2 10:50:08 gaz kernel: [40250.390641] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Mar 2 10:50:08 gaz kernel: [40250.390648] CR2: 00000000024b03f0 CR3: 000000021c5d1000 CR4: 00000000000006e0 Mar 2 10:50:08 gaz kernel: [40250.390656] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Mar 2 10:50:08 gaz kernel: [40250.390663] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Mar 2 10:50:08 gaz kernel: [40250.390671] Process munin-limits (pid: 11482, threadinfo ffff88021cc8c000, task ffff88021bf59530) Mar 2 10:50:08 gaz kernel: [40250.390681] Stack: Mar 2 10:50:08 gaz kernel: [40250.390687] ffffffff810f1d4a ffff880208c63228 0000000000000000 00007fffc2dcecc0 Mar 2 10:50:08 gaz kernel: [40250.390697] <0> 00000000024ba2b0 0000000002295010 ffffffff810f1e3d 0000000000000004 Mar 2 10:50:08 gaz kernel: [40250.390712] <0> ffff88021bf59530 ffff88021c4edc00 ffffffff812fe0b6 ffff88021c4edc60 Mar 2 10:50:08 gaz kernel: [40250.390732] Call Trace: Mar 2 10:50:08 gaz kernel: [40250.390742] [<ffffffff810f1d4a>] ? vfs_fstatat+0x2c/0x57 Mar 2 10:50:08 gaz kernel: [40250.390750] [<ffffffff810f1e3d>] ? sys_newstat+0x11/0x30 Mar 2 10:50:08 gaz kernel: [40250.390760] [<ffffffff812fe0b6>] ? do_page_fault+0x2e0/0x2fc Mar 2 10:50:08 gaz kernel: [40250.390768] [<ffffffff812fbf55>] ? page_fault+0x25/0x30 Mar 2 10:50:08 gaz kernel: [40250.390777] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b Mar 2 10:50:08 gaz kernel: [40250.390783] Code: Bad RIP value. Mar 2 10:50:08 gaz kernel: [40250.390791] RIP [<00000000024b03f0>] 0x24b03f0 Mar 2 10:50:08 gaz kernel: [40250.390799] RSP <ffff88021cc8dec0> Mar 2 10:50:08 gaz kernel: [40250.390805] CR2: 00000000024b03f0 Mar 2 10:50:08 gaz kernel: [40250.391051] ---[ end trace 1cc1473b539c7f6e ]--- Mar 2 11:42:20 gaz kernel: [43382.242301] php5-cgi[10963]: segfault at d81160 ip 0000000000d81160 sp 00007fff3adcb058 error 15 Mar 2 21:51:14 gaz kernel: [79916.418302] php5-cgi[20089]: segfault at 1c59dc8 ip 0000000001c59dc8 sp 00007fff9b877fb8 error 15 Mar 3 03:45:01 gaz kernel: [101143.334305] munin-update[22519] general protection ip:7f516dce204c sp:7fff6049a978 error:0 in libperl.so.5.10.1[7f516dc7d000+164000] Mar 3 11:22:37 gaz kernel: [128599.570307] php5-cgi[22888]: segfault at 36485a8 ip 00000000036485a8 sp 00007fff2d56e1c8 error 15 Mar 4 08:32:17 gaz kernel: [204779.842304] php5-cgi[22090]: segfault at 18 ip 0000000000689e5e sp 00007fff677a6a48 error 6 in php5-cgi[400000+6f9000] Mar 4 10:01:02 gaz kernel: [210104.434706] rsync[22236] general protection ip:7f14a07137f9 sp:7fff88f940b8 error:0 in libc-2.11.2.so[7f14a069d000+158000] Mar 4 11:32:22 gaz kernel: [215584.262316] BUG: unable to handle kernel paging request at 00000000ffffff9c Mar 4 11:32:22 gaz kernel: [215584.262331] IP: [<00000000ffffff9c>] 0xffffff9c Mar 4 11:32:22 gaz kernel: [215584.262343] PGD 0 Mar 4 11:32:22 gaz kernel: [215584.262350] Oops: 0010 [#2] SMP Mar 4 11:32:22 gaz kernel: [215584.262359] last sysfs file: /sys/devices/pci0000:00/0000:00:12.0/host4/target4:0:0/4:0:0:0/block/sdb/stat Mar 4 11:32:22 gaz kernel: [215584.262371] CPU 1 Mar 4 11:32:22 gaz kernel: [215584.262378] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative xt_recent xt_tcpudp iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 ip6table_filter ip6_tables xt_DSCP xt_TCPMSS ipt_LOG ipt_REJECT iptable_mangle iptable_filter xt_multiport xt_state xt_limit xt_conntrack nf_conntrack_ftp nf_conntrack ip_tables x_tables loop snd_hda_codec_atihdmi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm radeon snd_timer ttm snd drm_kms_helper soundcore drm snd_page_alloc i2c_algo_bit shpchp i2c_piix4 edac_core pcspkr k8temp evdev edac_mce_amd pci_hotplug i2c_core button ext3 jbd mbcache dm_mod powernow_k8 aacraid 3w_9xxx 3w_xxxx raid10 raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid1 raid0 md_mod sata_nv sata_sil sata_via sd_mod crc_t10dif ata_generic ahci pata_atiixp ohci_hcd libata r8169 mii thermal ehci_hcd processor thermal_sys scsi_mod usbcore nls_base [last unloaded: scsi_wait_scan] Mar 4 11:32:22 gaz kernel: [215584.262552] Pid: 1960, comm: proxymap Tainted: G D 2.6.32-5-amd64 #1 MS-7368 Mar 4 11:32:22 gaz kernel: [215584.262563] RIP: 0010:[<00000000ffffff9c>] [<00000000ffffff9c>] 0xffffff9c Mar 4 11:32:22 gaz kernel: [215584.262573] RSP: 0018:ffff880209257e00 EFLAGS: 00010212 Mar 4 11:32:22 gaz kernel: [215584.262580] RAX: ffff8801514eb780 RBX: ffffffff810efb2d RCX: 0000000000000000 Mar 4 11:32:22 gaz kernel: [215584.262590] RDX: 0000000000000020 RSI: 0000000000000001 RDI: ffff8801514eb780 Mar 4 11:32:22 gaz kernel: [215584.262600] RBP: 00000000ffffffe9 R08: 0000000000000000 R09: 0000000000000000 Mar 4 11:32:22 gaz kernel: [215584.262611] R10: ffff880209257e78 R11: ffffffff81152c7c R12: 0000000000000001 Mar 4 11:32:22 gaz kernel: [215584.262622] R13: 0000000000008001 R14: 0000000000000024 R15: 00000000ffffff9c Mar 4 11:32:22 gaz kernel: [215584.262633] FS: 00007fca4de35700(0000) GS:ffff880008d00000(0000) knlGS:0000000000000000 Mar 4 11:32:22 gaz kernel: [215584.262644] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Mar 4 11:32:22 gaz kernel: [215584.262650] CR2: 00000000ffffff9c CR3: 00000001c9cbb000 CR4: 00000000000006e0 Mar 4 11:32:22 gaz kernel: [215584.262661] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Mar 4 11:32:22 gaz kernel: [215584.262671] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Mar 4 11:32:22 gaz kernel: [215584.262682] Process proxymap (pid: 1960, threadinfo ffff880209256000, task ffff88021c4b1c40) Mar 4 11:32:22 gaz kernel: [215584.262693] Stack: Mar 4 11:32:22 gaz kernel: [215584.262698] ffffffff810f8566 ffff880209257e78 ffff88021c7bf000 ffff88021c7bf0c8 Mar 4 11:32:22 gaz kernel: [215584.262709] <0> 0000800000000000 ffff88021fc0f000 ffff880209257e78 00000000fffffffe Mar 4 11:32:22 gaz kernel: [215584.262724] <0> ffffffff810e5881 ffff880209257f48 0000000000000286 ffff88021fc0f000 Mar 4 11:32:22 gaz kernel: [215584.262743] Call Trace: Mar 4 11:32:22 gaz kernel: [215584.262753] [<ffffffff810f8566>] ? do_filp_open+0xa7/0x94b Mar 4 11:32:22 gaz kernel: [215584.262763] [<ffffffff810e5881>] ? virt_to_head_page+0x9/0x2a Mar 4 11:32:22 gaz kernel: [215584.262771] [<ffffffff810f9904>] ? user_path_at+0x52/0x79 Mar 4 11:32:22 gaz kernel: [215584.262779] [<ffffffff810cfec1>] ? get_unmapped_area+0xd7/0x139 Mar 4 11:32:22 gaz kernel: [215584.262787] [<ffffffff811019d5>] ? alloc_fd+0x67/0x10c Mar 4 11:32:22 gaz kernel: [215584.262795] [<ffffffff810eceaf>] ? do_sys_open+0x55/0xfc Mar 4 11:32:22 gaz kernel: [215584.262804] [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b Mar 4 11:32:22 gaz kernel: [215584.262811] Code: Bad RIP value. Mar 4 11:32:22 gaz kernel: [215584.262819] RIP [<00000000ffffff9c>] 0xffffff9c Mar 4 11:32:22 gaz kernel: [215584.262828] RSP <ffff880209257e00> Mar 4 11:32:22 gaz kernel: [215584.262833] CR2: 00000000ffffff9c Mar 4 11:32:22 gaz kernel: [215584.263077] ---[ end trace 1cc1473b539c7f6f ]--- As you can see there are segfaults, a general protection fault and a Kernel Oops. My first guess was that there's a Hardware problem of some sort and I asked my Hoster (it's a rented root server) to do a full hardwarecheck - they did, but couldn't find any problem. I don't know what and how they checked but their support team is usually quite good. I ran memtester and cpuburn myself and couldn't find any error either. Unfortunately I have no reliable way to reproduce these segfaults, they seem to be more or less random. On a hunch I disabled the firewall of the system and ran one of the programs that segfaulted regularily (imapsync) and it seemed to take longer to segfault than before, so the problem might be related to the network stack. Or could just be a random thing. Here are the kernel specs: # uname -a Linux gaz 2.6.32-5-amd64 #1 SMP Wed Jan 12 03:40:32 UTC 2011 x86_64 GNU/Linux # cat /etc/debian_version 6.0 # lsmod Module Size Used by cpufreq_userspace 1992 0 cpufreq_stats 2659 0 cpufreq_powersave 902 0 cpufreq_conservative 5162 0 xt_recent 5977 0 xt_tcpudp 2319 0 iptable_nat 4299 0 nf_nat 13388 1 iptable_nat nf_conntrack_ipv4 9833 3 iptable_nat,nf_nat nf_defrag_ipv4 1139 1 nf_conntrack_ipv4 ip6table_filter 2384 0 ip6_tables 15075 1 ip6table_filter xt_DSCP 1995 0 xt_TCPMSS 2919 0 ipt_LOG 4518 0 ipt_REJECT 1953 0 iptable_mangle 2817 0 iptable_filter 2258 0 xt_multiport 2267 0 xt_state 1303 0 xt_limit 1782 0 xt_conntrack 2407 0 nf_conntrack_ftp 5537 0 nf_conntrack 46535 6 iptable_nat,nf_nat,nf_conntrack_ipv4,xt_state,xt_conntrack,nf_conntrack_ftp ip_tables 13899 3 iptable_nat,iptable_mangle,iptable_filter x_tables 12845 13 xt_recent,xt_tcpudp,iptable_nat,ip6_tables,xt_DSCP,xt_TCPMSS,ipt_LOG,ipt_REJECT,xt_multiport,xt_state,xt_limit,xt_conntrack,ip_tables loop 11799 0 radeon 573996 0 ttm 39986 1 radeon drm_kms_helper 20065 1 radeon snd_hda_codec_atihdmi 2251 1 drm 142359 3 radeon,ttm,drm_kms_helper snd_hda_intel 20019 0 i2c_algo_bit 4225 1 radeon pcspkr 1699 0 i2c_piix4 8328 0 snd_hda_codec 54244 2 snd_hda_codec_atihdmi,snd_hda_intel i2c_core 15712 5 radeon,drm_kms_helper,drm,i2c_algo_bit,i2c_piix4 snd_hwdep 5380 1 snd_hda_codec snd_pcm 60503 2 snd_hda_intel,snd_hda_codec snd_timer 15582 1 snd_pcm snd 46446 5 snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer soundcore 4598 1 snd evdev 7352 3 snd_page_alloc 6249 2 snd_hda_intel,snd_pcm k8temp 3283 0 edac_core 29261 0 edac_mce_amd 6433 0 shpchp 26264 0 pci_hotplug 21203 1 shpchp button 4650 0 ext3 106518 2 jbd 37085 1 ext3 mbcache 5050 1 ext3 dm_mod 53754 0 powernow_k8 10978 1 aacraid 59779 0 3w_9xxx 28684 0 3w_xxxx 20569 0 raid10 17809 0 raid456 44500 0 async_raid6_recov 5170 1 raid456 async_pq 3479 2 raid456,async_raid6_recov raid6_pq 77179 2 async_raid6_recov,async_pq async_xor 2478 3 raid456,async_raid6_recov,async_pq xor 4380 1 async_xor async_memcpy 1198 2 raid456,async_raid6_recov async_tx 1734 5 raid456,async_raid6_recov,async_pq,async_xor,async_memcpy raid1 18431 3 raid0 5517 0 md_mod 73824 7 raid10,raid456,raid1,raid0 sata_nv 19166 0 sata_sil 7412 0 sata_via 7928 0 sd_mod 29889 8 crc_t10dif 1276 1 sd_mod ata_generic 3047 0 ahci 32374 6 r8169 29229 0 mii 3210 1 r8169 thermal 11674 0 pata_atiixp 3489 0 libata 133632 6 sata_nv,sata_sil,sata_via,ata_generic,ahci,pata_atiixp ohci_hcd 19212 0 ehci_hcd 31151 0 processor 29935 1 powernow_k8 thermal_sys 11942 2 thermal,processor scsi_mod 122149 5 aacraid,3w_9xxx,3w_xxxx,sd_mod,libata usbcore 122034 3 ohci_hcd,ehci_hcd nls_base 6377 1 usbcore # free total used free shared buffers cached Mem: 8166128 1228036 6938092 0 140412 782060 -/+ buffers/cache: 305564 7860564 Swap: 2102456 0 2102456 So, basically my questions are: How can I diagnose this further? Is there any data in the log above that could help me to isolate the troublemaker? Are there any known problems with the above hardware/software I overlooked when googling for it? Is there a way to prevent the kernel from autoloading modules (I probably don't need all these modules and one of them might be the culprit)

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