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  • IPP linker errors on cygwin

    - by Jason Sundram
    I've built a program that uses mkl and ipp that runs on mac and linux. I'm now building that program for Windows using cygwin and gcc, and can't get it to link. The errors I'm getting are: Warning: .drectve -defaultlib:"uuid.lib" ' unrecognized ../../../bin/libMath.a(VectorUtility.cxx.o):VectorUtility.cxx:(.text+0x95): undefined reference to _ippGetLibVersion' ../../../bin/libMath.a(VectorUtility.cxx.o):VectorUtility.cxx:(.text+0x157): undefined reference to `_ippsWinHann_32f_I' (and many more like that). I'm using link path: /opt/intel/IPP/6.1.2.041/ia32/lib and linking to the following: ippiemerged, ippimerged, ippmemerged, ippmmerged, ippsemerged, ippsmerged and ippcorel. Can someone point me to what I'm doing wrong?

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  • Will the Driver Support for Intel HD Graphics be Improved in 12.10?

    - by Hiranya
    I recently installed Ubuntu 12.04 on a HP Pavilion dv4 laptop. This is a core i7 machine with Intel HD graphics and also a separate nVidia VGA card. I had a lot of issues getting Ubuntu 12.04 working on this system. First there were issues booting up the live CD for installation. I worked around that by using the 'nomodeset' option. Then I continued to have similar issues after installation has completed. So I had to permanently add the nomodeset option to my GRUB boot configuration. At the moment I have a working installation but there are many issues: Ubuntu GUI is a bit flaky at times. The mouse pointer goes on and off when hovering over certain icons. Certain things doesn't get rendered properly on the screen. I can't access any of the tty consoles. Hitting Ctrl+Alt+F[1-6] gives me a blank screen. And once that happens I can't even come back to the UI by hitting Ctrl+Alt+F7. I've realized that tty consoles are actually working. I just can't see the text. If I enter a command like 'sudo reboot' into the empty screen the machine reboots. Can't get external displays (monitors, projectors etc) working. But I think this is probably because the VGA out is wired to the nVidia card which is not being used by Linux. colord program crashes every now and then triggering a popup message. So my main question is, will the support for Intel HD graphics be improved in the next release? Or will I have to keep using the nomodeset option in the new release too? Also I appreciate if anybody can shed some light on any of the issues listed above. Thanks in advance.

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  • C# performance analysis- how to count CPU cycles?

    - by Lirik
    Is this a valid way to do performance analysis? I want to get nanosecond accuracy and determine the performance of typecasting: class PerformanceTest { static double last = 0.0; static List<object> numericGenericData = new List<object>(); static List<double> numericTypedData = new List<double>(); static void Main(string[] args) { double totalWithCasting = 0.0; double totalWithoutCasting = 0.0; for (double d = 0.0; d < 1000000.0; ++d) { numericGenericData.Add(d); numericTypedData.Add(d); } Stopwatch stopwatch = new Stopwatch(); for (int i = 0; i < 10; ++i) { stopwatch.Start(); testWithTypecasting(); stopwatch.Stop(); totalWithCasting += stopwatch.ElapsedTicks; stopwatch.Start(); testWithoutTypeCasting(); stopwatch.Stop(); totalWithoutCasting += stopwatch.ElapsedTicks; } Console.WriteLine("Avg with typecasting = {0}", (totalWithCasting/10)); Console.WriteLine("Avg without typecasting = {0}", (totalWithoutCasting/10)); Console.ReadKey(); } static void testWithTypecasting() { foreach (object o in numericGenericData) { last = ((double)o*(double)o)/200; } } static void testWithoutTypeCasting() { foreach (double d in numericTypedData) { last = (d * d)/200; } } } The output is: Avg with typecasting = 468872.3 Avg without typecasting = 501157.9 I'm a little suspicious... it looks like there is nearly no impact on the performance. Is casting really that cheap?

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  • WPF Application Typing in Custom TextBox CPU Jumping from 3 to 80 percent

    - by azamsharp
    I have created a RichTextBox called SharpTextBox which indicates and limits the number of characters that can be typed in it. The implementation is shown in the following link: http://www.highoncoding.com/Articles/673_Creating_SharpRichTextBox_for_Live_Character_Count_in_WPF.aspx Anyway when I start typing in the TextBox it goes from 3% to 78%. The TextBox updates the Label control which shows the number of characters remaining for the count. How can I increase the performance of the textbox? UPDATE: I read there seems to be some problem with the TextRange.Text property which kills performance.

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  • Minimal "Task Queue" with stock Linux tools to leverage Multicore CPU

    - by Manuel
    What is the best/easiest way to build a minimal task queue system for Linux using bash and common tools? I have a file with 9'000 lines, each line has a bash command line, the commands are completely independent. command 1 > Logs/1.log command 2 > Logs/2.log command 3 > Logs/3.log ... My box has more than one core and I want to execute X tasks at the same time. I searched the web for a good way to do this. Apparently, a lot of people have this problem but nobody has a good solution so far. It would be nice if the solution had the following features: can interpret more than one command (e.g. command; command) can interpret stream redirects on the lines (e.g. ls > /tmp/ls.txt) only uses common Linux tools Bonus points if it works on other Unix-clones without too exotic requirements.

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  • mkmapview cpu usage on iphone 3G

    - by mozveren
    Hello all, I have some troubles with iphone 3G and Mkmapview. After a certain random time, my application freeze. When I launch with performances tool, I can see that the application a lot of time to retrieve map tiles in cache. 19.6 7006 Foundation +[NSURLConnection(NSURLConnectionReallyInternal) 18.5 6613 GMM GMM::TileCachePrivate::runCacheThread() Its seems that the MkMapView component launch several threads to load the tiles in caches. How I can avoid this behavior ? The behavior seems to not make troubles on 3GS. Thanks

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  • C#: Perform Operations on GPU, not CPU (Calculate Pi)

    - by Alex
    Hello, I've recently read a lot about software (mostly scientific/math and encryption related) that moves part of their calculation onto the GPU which causes a 100-1000 (!) fold increase in speed for supported operations. Is there a library, API or other way to run something on the GPU via C#? I'm thinking of simple Pi calculation. I have a GeForce 8800 GTX if that's relevant at all (would prefer card independent solution though). Any hints are appreciated!

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  • Measure CPU performance via JS

    - by Nicholas Kyriakides
    A webapp has as a central component a relatively heavy algorithm that handles geometric operations. There are 2 solutions to make the whole thing accessible from both high-end machines and relatively slower mobile devices. I will use RPC's if i detect that the user machine is ''slow'' or else if i detect that the user machine can handle it OK, then i provide to the webapp the script to handle it client side. Now what would be a reliable way to detect the speed of the user machine? I was thinking of providing a sample script as a test when the page loads and detect the time it took to execute that. Any ideas?

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  • Distributing cpu-bound compression jobs to multiple computers?

    - by barnaby
    The other day I needed to archive a lot of data on our network and I was frustrated I had no immediate way to harness the power of multiple machines to speed-up the process. I understand that creating a distributed job management system is a leap from a command-line archiving tool. I'm now wondering what the simplest solution to this type of distributed performance scenario could be. Would a custom tool always be a requirement or are there ways to use standard utilities and somehow distribute their load transparently at a higher level? Thanks for any suggestions.

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  • CPU emulator on C for assembler

    - by krlzx00
    Hi, there. I have a problem. I´m working on a little aplication of security, but i recived an array that means a bytes, and that bytes can be interpreted as a assembler code, so my cuestion is.... some one knows a library that a i can use on my aplication that can execute this bytes and show what it do, or something like that?

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  • Getting the alternative to the 200-Line Linux Kernel patch to work

    - by Gödel
    Apparently, there is a comparable alternative to the 200-line kernel patch that involves no kernel upgrade. It is presented here and discussed here. However, I am not sure if webupd8's solution (under the section "Use it in Ubuntu") on Ubuntu actually works or not. In particular, one commenter on ./ is saying he's getting an error message. Could anyone post the "correct" method that actually works? Suggested solution: Based on the comments I've read so far, the following seems to work. (1) In /etc/rc.local, add the following lines to above exit 0: mkdir -p /dev/cgroup/cpu mount -t cgroup cgroup /dev/cgroup/cpu -o cpu mkdir -m 0777 /dev/cgroup/cpu/user echo "/usr/local/sbin/cgroup_clean" > /dev/cgroup/cpu/release_agent (2) Create a file named /usr/local/sbin/cgroup_clean with the following content: #!/bin/sh rmdir /dev/cgroup/cpu/$1 (3) In your ~/.bashrc, add: if [ "$PS1" ] ; then mkdir -m 0700 /dev/cgroup/cpu/user/$$ echo $$ > /dev/cgroup/cpu/user/$$/tasks echo "1" > /dev/cgroup/cpu/user/$$/notify_on_release fi (4) (To make sure the execution bit is on) execute sudo chmod +x /usr/local/sbin/cgroup_clean /etc/rc.local (5) Reboot.

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  • Running 64 bit Ubuntu distribution from 32 bit Ubuntu

    - by csg
    Related to this question How do I run qemu with 64bit processor on a 64bit machine?, I'm trying to run latest ubuntu 11.10 64bit distribution under Ubuntu 11.04 32 bit using qemu on a core2duo (64 bit cpu) machine, using following qemu parameters with no success. Error under qemu: "This kernel required an x86-64 CPU, but only detected an i686 CPU. Unable to boot - please use a kernel appropiate for your CPU" Isn't qemu suppose to emulate a 64 bit machine? I think I'm missing something, but I can't figure it out. qemu -cpu (kvm64|core2duo|qemu64) -boot d -cdrom ubuntu-11.10-desktop-amd64.iso qemu-system-x86_64 -boot d -cdrom ubuntu-11.10-desktop-amd64.iso Here is my uname -m i686 Here is my /proc/cpuinfo processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU P8400 @ 2.26GHz stepping : 6 cpu MHz : 800.000 cache size : 3072 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm dts tpr_shadow vnmi flexpriority bogomips : 4522.45 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:

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  • Is this a dual monitor reset bug?

    - by Tentresh
    My two displays are: Intel GMA x4500 Laptop (1280x800 native resolution of the built-in display) External display (1920x1080) A few minutes after I login to my dual monitor setup, it gets reset to mirror screens. If I restore the settings via the displays application, everything is fine. On each reset, the following messages are written into /var/log/Xorg.0.log: [ 60.852] (II) PM Event received: Capability Changed [ 60.852] I830PMEvent: Capability change [ 132.920] (II) intel(0): EDID vendor "SEC", prod id 12869 [ 132.920] (II) intel(0): Printing DDC gathered Modelines: [ 132.920] (II) intel(0): Modeline "1280x800"x0.0 68.94 1280 1296 1344 1408 800 801 804 816 -hsync -vsync (49.0 kHz) [ 134.228] (II) intel(0): Allocated new frame buffer 1280x800 stride 5120, tiled Whereas right on startup or manual resolution reset, /var/log/Xorg.0.log reports the expected frame buffer allocation: [ 1562.382] (II) intel(0): EDID vendor "SEC", prod id 12869 [ 1562.382] (II) intel(0): Printing DDC gathered Modelines: [ 1562.382] (II) intel(0): Modeline "1280x800"x0.0 68.94 1280 1296 1344 1408 800 801 804 816 -hsync -vsync (49.0 kHz) [ 1576.740] (II) intel(0): Allocated new frame buffer 3200x1080 stride 12800, tiled Is Ubuntu 12.04 not compatible with my video card? Can this be solved within Ubuntu? I like its interface, but manually fiddling with resolution on every login is not bearable.

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  • Audio comes out of both headphone and speaker at the same time.. Ubuntu 12.04LTS [closed]

    - by pst007x
    I have the same issue on an Aspire. Ubuntu 12.04LTS 64bit realtek audio sound chip onboard If I plug in a headset, audio does not switch from internal speaker to headset, instead plays out of both at the same time. I have looked at the alsamixer setting, all on. I installed gnome-alsamixer, and I noticed headphone was ticked, if I untick the main audio mutes, and the headphone no longer works. Headset only works with internal speaker. Audio works fine on my other desktop and laptop running this release 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03) salvatore@salvatore-Aspire-7730:~$ cat /proc/asound/version Advanced Linux Sound Architecture Driver Version 1.0.24. salvatore@salvatore-Aspire-7730:~$ head -n 1 /proc/asound/card*/codec#* ==> /proc/asound/card0/codec#0 <== Codec: Realtek ALC888 ==> /proc/asound/card0/codec#1 <== Codec: LSI ID 1040 ==> /proc/asound/card0/codec#2 <== Codec: Intel Cantiga HDMI salvatore@salvatore-Aspire-7730:~$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC888 Analog [ALC888 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Intel [HDA Intel], device 1: ALC888 Digital [ALC888 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: Intel [HDA Intel], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 salvatore@salvatore-Aspire-7730:~$ uname -a Linux salvatore-Aspire-7730 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux salvatore@salvatore-Aspire-7730:~$ The alsa-base.conf does not exist Tried this: sudo apt-get remove --purge alsa-base sudo apt-get remove --purge pulseaudio sudo apt-get install alsa-base sudo apt-get install pulseaudio sudo alsa force-reload Then: sudo apt-get purge pulseaudio gstreamer0.10-pulseaudio sudo apt-get install pulseaudio gstreamer0.10-pulseaudio indicator-sound Tred this. sudo gedit Then open terminal: sudo /etc/modprobe.d/alsa-base.conf At the end of the file add a new line: options snd-hda-intel model=generic Save and then reboot But alsa-base.conf does not exist

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  • Ubuntu 12.04 dual monitor reset bug

    - by Tentresh
    My two displays are: Intel GMA x4500 Laptop (1280x800 native resolution of the built-in display) External display (1920x1080) Few minutes after I login to my dual monitor setup its get reset to mirror screens. If I restore the settings via displays application everything is fine. On each reset the following messages are written into /var/log/Xorg.0.log: [ 60.852] (II) PM Event received: Capability Changed [ 60.852] I830PMEvent: Capability change [ 132.920] (II) intel(0): EDID vendor "SEC", prod id 12869 [ 132.920] (II) intel(0): Printing DDC gathered Modelines: [ 132.920] (II) intel(0): Modeline "1280x800"x0.0 68.94 1280 1296 1344 1408 800 801 804 816 -hsync -vsync (49.0 kHz) [ 134.228] (II) intel(0): Allocated new frame buffer 1280x800 stride 5120, tiled Whereas right on startup or manual resolution reset /var/log/Xorg.0.log reports the expected frame buffer allocation: [ 1562.382] (II) intel(0): EDID vendor "SEC", prod id 12869 [ 1562.382] (II) intel(0): Printing DDC gathered Modelines: [ 1562.382] (II) intel(0): Modeline "1280x800"x0.0 68.94 1280 1296 1344 1408 800 801 804 816 -hsync -vsync (49.0 kHz) [ 1576.740] (II) intel(0): Allocated new frame buffer 3200x1080 stride 12800, tiled Is Ubuntu 12.04 not compatible with my video card? Can this be solved within Ubuntu? I like it's interface, but manually fiddling with resolution on every login is not bearable.

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  • Cache consistency & spawning a thread

    - by Dave Keck
    Background I've been reading through various books and articles to learn about processor caches, cache consistency, and memory barriers in the context of concurrent execution. So far though, I have been unable to determine whether a common coding practice of mine is safe in the strictest sense. Assumptions The following pseudo-code is executed on a two-processor machine: int sharedVar = 0; myThread() { print(sharedVar); } main() { sharedVar = 1; spawnThread(myThread); sleep(-1); } main() executes on processor 1 (P1), while myThread() executes on P2. Initially, sharedVar exists in the caches of both P1 and P2 with the initial value of 0 (due to some "warm-up code" that isn't shown above.) Question Strictly speaking – preferably without assuming any particular CPU – is myThread() guaranteed to print 1? With my newfound knowledge of processor caches, it seems entirely possible that at the time of the print() statement, P2 may not have received the invalidation request for sharedVar caused by P1's assignment in main(). Therefore, it seems possible that myThread() could print 0. References These are the related articles and books I've been reading. (It wouldn't allow me to format these as links because I'm a new user - sorry.) Shared Memory Consistency Models: A Tutorial hpl.hp.com/techreports/Compaq-DEC/WRL-95-7.pdf Memory Barriers: a Hardware View for Software Hackers rdrop.com/users/paulmck/scalability/paper/whymb.2009.04.05a.pdf Linux Kernel Memory Barriers kernel.org/doc/Documentation/memory-barriers.txt Computer Architecture: A Quantitative Approach amazon.com/Computer-Architecture-Quantitative-Approach-4th/dp/0123704901/ref=dp_ob_title_bk

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  • Why this code generates different numbers?

    - by frbry
    Hello, I have this function that creates a unique number for hard-disk and CPU combination. DWORD hw_hash() { char drv[4]; char szNameBuffer[256]; DWORD dwHddUnique; DWORD dwProcessorUnique; DWORD dwUniqueKey; char *sysDrive = getenv ("SystemDrive"); strcpy(drv, sysDrive); drv[2] = '\\'; drv[3] = 0; GetVolumeInformation(drv, szNameBuffer, 256, &dwHddUnique, NULL, NULL, NULL, NULL); SYSTEM_INFO si; GetSystemInfo(&si); dwProcessorUnique = si.dwProcessorType + si.wProcessorArchitecture + si.wProcessorRevision; dwUniqueKey = dwProcessorUnique + dwHddUnique; return dwUniqueKey; } It returns different numbers if I format my hard-disk and install a new Windows. Any ideas, why? Thank you. Edit: OK, Got it: This function returns the volume serial number that the operating system assigns when a hard disk is formatted. To programmatically obtain the hard disk's serial number that the manufacturer assigns, use the Windows Management Instrumentation (WMI) Win32_PhysicalMedia property SerialNumber. I should do more research before posting my problems online. Sorry to bother you, let's keep this here in case anybody else can need it.

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  • Why is this JLabel continuously repainting?

    - by Morinar
    I've got an item that appears to continuously repaint when it exists, causing the CPU to spike whenever it is in any of my windows. It directly inherits from a JLabel, and unlike the other JLabels on the screen, it has a red background and a border. I have NO idea why it would be different enough to continuously repaint. The callstack looks like this: Thread [AWT-EventQueue-1] (Suspended (breakpoint at line 260 in sItem)) sItem.paint(Graphics) line: 260 sItem(JComponent).paintToOffscreen(Graphics, int, int, int, int, int, int) line: 5124 RepaintManager$PaintManager.paintDoubleBuffered(JComponent, Image, Graphics, int, int, int, int) line: 1475 RepaintManager$PaintManager.paint(JComponent, JComponent, Graphics, int, int, int, int) line: 1406 RepaintManager.paint(JComponent, JComponent, Graphics, int, int, int, int) line: 1220 sItem(JComponent)._paintImmediately(int, int, int, int) line: 5072 sItem(JComponent).paintImmediately(int, int, int, int) line: 4882 RepaintManager.paintDirtyRegions(Map<Component,Rectangle>) line: 803 RepaintManager.paintDirtyRegions() line: 714 RepaintManager.seqPaintDirtyRegions() line: 694 [local variables unavailable] SystemEventQueueUtilities$ComponentWorkRequest.run() line: 128 InvocationEvent.dispatch() line: 209 summitEventQueue(EventQueue).dispatchEvent(AWTEvent) line: 597 summitEventQueue(SummitHackableEventQueue).dispatchEvent(AWTEvent) line: 26 summitEventQueue.dispatchEvent(AWTEvent) line: 62 EventDispatchThread.pumpOneEventForFilters(int) line: 269 EventDispatchThread.pumpEventsForFilter(int, Conditional, EventFilter) line: 184 EventDispatchThread.pumpEventsForHierarchy(int, Conditional, Component) line: 174 EventDispatchThread.pumpEvents(int, Conditional) line: 169 EventDispatchThread.pumpEvents(Conditional) line: 161 EventDispatchThread.run() line: 122 [local variables unavailable] It basically just continually hits that over and over again as fast as I can press continue. The code that is "unique" to this particular label looks approximately like this: bgColor = OurColors.clrWindowTextAlert; textColor = Color.white; setBackground(bgColor); setOpaque(true); setSize(150, getHeight()); Border border_warning = BorderFactory.createCompoundBorder( BorderFactory.createMatteBorder(1, 1, 1, 1, OurColors.clrXBoxBorder), Global.border_left_margin); setBorder(border_warning); It obviously does more, but that particular block only exists for these labels that are causing the spike/continuous repaint. Any ideas why it would keep repainting this particular label?

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  • Determine target architecture of binary file in Linux (library or executable)

    - by Fernando Miguélez
    We have an issue related to a Java application running under a (rather old) FC3 on a Advantech POS board with a Via C3 processor. The java application has several compiled shared libs that are accessed via JNI. Via C3 processor is suppossed to be i686 compatible. Some time ago after installing Ubuntu 6.10 on a MiniItx board with the same processor I found out that the previous statement is not 100% true. The Ubuntu kernel hanged on startup due to the lack of some specific and optional instructions of the i686 set in the C3 processor. These instructions missing in C3 implementation of i686 set are used by default by GCC compiler when using i686 optimizations. The solution in this case was to go with a i386 compiled version of Ubuntu distribution. The base problem with the Java application is that the FC3 distribution was installed on the HD by cloning from an image of the HD of another PC, this time an Intel P4. Afterwards the distribution needed some hacking to have it running such as replacing some packages (such as the kernel one) with the i383 compiled version. The problem is that after working for a while the system completely hangs without a trace. I am afraid that some i686 code is left somewhere in the system and could be executed randomly at any time (for example after recovering from suspend mode or something like that). My question is: Is there any tool or way to find out at what specific architecture is an binary file (executable or library) aimed provided that "file" does not give so much information?

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