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• Desktop goes un-usable after upgrade to 12.04

  - by Tom Nail

  I have multiple Ubuntu systems connected to a KVM, one of which I recently upgraded from Ubuntu 10 to 12.04. After the upgrade, this system desktop does fine until it is allowed to go to idle (i.e., I've switched to another system on the KVM and it locks it's desktop). When I come back to it, the screen is garbled and paging across at a rate seemingly determined by the mouse. Although no pointer is visible, I can get the screen to stop paging (and just be garbled) by moving the mouse left and right. The paging will slow down and come to a stop, if I can align things carefully enough. This condition persists even when I try to go to a CLI-based login (e.g., CTRL+Alt+F1) and will continue until I reboot the machine. Unfortunately, I'm not very familiar with the Unity desktop, so I don't know where to find things to troubleshoot. A restart of lightdm doesn't change anything, so I'm wondering if this might be more hardware based( although this machine hasn't given me any trouble previously in the same setup). The .xsession-errors file has some issues with compiz, nautilus and GConf listed, but I'm not sure those are actually germane to the issue. Thanks for any help, -=Tom

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• Is Apple getting out of the general purpose development platform business?

  - by Charles E. Grant

  I've been doing general ANSI C/Console C++/Java/Web development on Mac hardware for about ten years. I make no claims of objective superiority over other platforms, it just satisfies my personal tastes. With the success of the iPhone and the related App store there was some speculation that Apple would get out of the general purpose computer market, and become a closed software ecosystem, focusing on consumer appliances. I pooh-poohed the speculation at the time, but this week Apple announced that a) they were opening an App store for the Mac, b) Java applications would not be eligible for the App store, c) the Apple JVM was being deprecated and might not be available for future releases of OS X. I'm not a Java developer per se, but I work in a research lab that occasionally writes Java applications, and also depends on tools written Java. This has the potential to be a huge pain in the butt for us. As of now, there is no other JVM for OS X that we can point our end users to. Soy Latte and OpenJDK might be appropriate for developers, but the complexity of the installation makes them inappropriate for end users. Eventually I expect Oracle/SUN will produce a replacement JVM for OS X. More worrisome to me is that Apple used to specifically advertise that it was an excellent platform for scientific development, because they supported all major language platforms. Is the deprecation of their JVM a sign that this market no longer interests them?

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• Ubuntu 12.04 Fails to Boot after Reboot

  - by Joe

  I have installed Ubuntu 12.04 on several Dell c6220 servers. The install was successful and all hardware is recognized. The problem that I am running into is that when issuing the reboot command or when pressing ctrl-alt-del, the server shuts down, but never comes back up. Instead, the fan revs up to full speed and stays that way until I power the server down. Once the server has been powered down via the power button, Ubuntu will boot just fine -- until the next reboot. I have found that by rebooting the server via the DRAC web interface will reboot the server correctly. I have also found that this problem does not exist with CentOS -- I can press ctrl-alt-del all day long and it always comes back up. I've tried several kernel parameters such as: reboot=bios reboot=pci reboot=acpi reboot=cold acpi=off noapic Nothing seems to work. I have also tried upgrading to kernel 3.4, but no change there, either. Has anyone run into a similar problem or any pointers on troubleshooting? Thanks, Joe

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• Weekend Project: Build a Fireball Launcher

  - by Jason Fitzpatrick

  What’s more fun than playing with fire? Shooting it from your hands. Put on your robe and wizard hat, make a stop at the hardware store, and spend the weekend trying to convince your friends you’ve acquired supernatural powers. Over at MAKE Magazine, Joel Johnson explains the impetus for his project: A stalwart of close-quarter magicians for years, the electronic flash gun is a simple device: a battery-powered, hand-held ignitor that uses a “glo-plug” to light a bit of flash paper and cotton, shooting a fireball a few feet into the air. You can buy one from most magic shops for around $50, but if you build one on your own, you’ll not only save a few bucks, you’ll also learn how easy it is to add fire effects to almost any electronics project. (And what gadget couldn’t stand a little more spurting flame?) The parts list is minimal but the end effect is pretty fantastic. Hit up the link below for the full build guide, plenty of warnings, and a weekend project that’s sure to impress. How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC How to Own Your Own Website (Even If You Can’t Build One) Pt 2

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• Microsoft Lowers Cloud Barrier To Entry

  - by Herve Roggero

  Once in a while, the technology stack changes enough to create a disturbance in the IT industry. Microsoft did just that today and has officially closed the gap with its #1 competitor: Amazon. What is remarkable is that Microsoft is no longer an alternative to Amazon, it is becoming a clear leader in that space. Some of the new features include official support for durable Virtual Machines with high availability (cross-geographic replication), free WebSites to try Azure, MySQL database at no charge, a new distributed low-latency cache feature, Linux support, support with existing VPN hardware for seamless on-premise integration, a new partner ecosystem and much, much more. Amazon had an edge against Windows Azure in the IaaS (Infrastructure as a Service) space, until now. With the latest release from Microsoft Azure, the gap has been filled. In fact, it seems Amazon may now have a gap to fill… This is great news to everyone; it seems that cloud offerings are becoming more standardized with the more mature cloud providers, and the management stack and quality of service of each cloud provider is increasingly becoming the differentiator. With today’s announcements, it is becoming clear that cloud providers are pushing hard to increase their service footprint and lowering typical barriers to entry such as support for open-source operating systems, free trial offers, higher availability, faster deployment times and simpler enterprise integration.

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• How can find out the device Id of my unmounted DVD?

  - by fred.bear

  When I put a DVD into the DVD drive, it appears in Nautilus Places, but is not automatically mounted. (this is by personal choice). In this unmounted state, mount (of course) reports nothing, and likewise for df.. but Nautilus is aware of the DVD hardware unit and has read the Label; which it shows in Places So it seems to me that Nautilus has already accessed the DVD devices (Did it temporarily mount it?)... The main point of my question was to determine how to find the device Id of an unmounted device .. but as I've been writing this, I now think it may not be as simple as that... This issue came up because I wanted to test this command cat iso-pieces.* | growisofs -Z /dev/dvd=/dev/stdin, but then realized that I didn't know how to get my DVD's device Id. ... and does the above command requires a mounted device, or does it write directly to the device? ... as you can see, I'm a bit vague about devices :) Come to think of it maybe Nautalus read the DVD device directly, because when all is said and done, something has to read/write directly to it. info growisofs says: Under Linux it will most likely be an ide-scsi device such as "/dev/scd0 How can I find this Id via a script?

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• XNA - Obtaining depth from the scene's render target?

  - by user1423893

  I'm currently rendering my scene to a render target so it can be used for rendering methods such as post processing and order independent transparency. rtScene = new RenderTarget2D( GraphicsDevice, GraphicsDevice.PresentationParameters.BackBufferWidth, GraphicsDevice.PresentationParameters.BackBufferHeight, false, SurfaceFormat.Rgba64, DepthFormat.Depth24Stencil8, // Requires a depth format for objects to be drawn correctly (e.g. wireframe model surrounding model) 0, RenderTargetUsage.PreserveContents ); I am required to use RenderTargetUsage.PreserveContents so that the same render target can be rendered to multiple times, once for each of the draw methods below. DrawBackground DrawDeferred DrawForward DrawTransparent The problem is that DrawTransparent requires a copy of the scene's depth as a texture. Is there any way to obtain this from the scene render target above (rtScene)? I can't have more than one render target with RenderTargetUsage.PreserveContents as this causes problems on hardware such as the XBOX 360, so rendering the depth to a separate render target at the same time as I render the scene isn't possible as far as I can tell. Would I be able to get around this problem by "Ping-Ponging" two render targets (using the more compatible RenderTargetUsage.DiscardContents) and using the result for the depth texture?

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• Engineered Systems and PCI

  - by Joel Weise

  Oracle has a number of different engineered systems.  These are design to be highly integrated, optimized and secure systems.  The Exadata database engineered system and the Exalogic application engineered system are two good examples.  Often I am asked how these comply with different standards and regulations.  Exalogic is the Oracle engineered system that supports applications and the focus of today's blog.  First, we must recognize that as a collection of hardware and software, we cannot simply state that Exalogic is "compliant" with PCI DSS.  This is because Exalogic must be implemented within the context of one's existing IT infrastructure, the security features of that infrastructure, the governance framework that exists, security policies, operational procedures, and other factors.  What we can say though, is that Exalogic has been designed with various security capabilities that can be utilized to support compliance to PCI DSS as well as other standards and regulations (e.g., NIST and HIPAA).  Given that, Exalogic can be an excellant platform for running PCI related payment applications.  Coalfire Systems, a leading QSA in the US, has evaluated Exalogic against PCI DSS and supports this position.  Their evaluation can be found here: Exalogic and PCI Compliance. I hope you find it useful. 

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• Ubuntu Server 12.04, NAT, Router, DNS. It just doesnt work

  - by Bjørnar Kibsgaard

  I recently inherited some server hardware from work and decided that it could be my main router at home (among other things). Ubuntu 12.04 server installation harware wise goes well and everything is found and working when I boot up. So I begin with setting up eth1 with DHCP. This works fine and it gets a public IP address from my modem and we have a working internet connection. Then I set up my other NIC (eth0) as static (192.168.0.1) and this also works fine. I can access it from other computers in the network. The problems are coming when I am trying to set up a DHCP server with isc-dhcp-server. It seems like it is working and giving the computers IP adresses but after one reboot it stops working. After the reboot eth1 will get a public ip from the modem but it doesnt have internet access. I have to manually run dhcpcd eth1 to get it to work again. As far as I know I havent made any changes to DNS. What am I doing wrong? I have never really had problems with this before. :)

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• alsa - sound issues on ubuntu 12.04

  - by tam_ubuuser

  i am having an sony E series laptop.i have an HDMI port .at this stage ,i have tested my sound card , which provides audio out on my laptop i.e i could hear songs .my laptop has two sound cards amd 5450 and an intel-hda(alsamixer shows that as s/pdif) . i decided to connect HDMI output to my new HD-TV.but, i could get only visuals on my TV,NO AUDIO OUTPUT ( HDMI cable works fine with win 7).my laptop has two sound cards.but i couldn't switch output to other card.( i don't know ,how to do that) i decided to update alsa. complied the following code in terminal. sudo apt-add-repository ppa:ubuntu-audio-dev/alsa-daily sudo apt-get update sudo apt-get install alsa-hda-dkms then,strangely no login sound, and no audio output on my laptop at all .then, started complied code from step1 sound troubleshooting procedure from offical ubuntu site.then, my speaker icon taskbar disappeared .obivously $aplay -l ,provided output as no soundcards detected . so , i implemented step 4 from that guide, it provides a output of all hardware devices in my laptop. *-multimedia UNCLAIMED description: Audio device product: Cedar HDMI Audio [Radeon HD 5400/6300 Series] vendor: Hynix Semiconductor (Hyundai Electronics) physical id: 0.1 bus info: pci@0000:01:00.1 version: 00 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi bus_master cap_list configuration: latency=0 resources: memory:f0040000-f0043fff *-multimedia UNCLAIMED description: Audio device product: 5 Series/3400 Series Chipset High Definition Audio vendor: Intel Corporation physical id: 1b bus info: pci@0000:00:1b.0 version: 05 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: latency=0 resources: memory:f5e00000-f5e03fff that command displayed output name of the two cards . but , still i have no positive output on $aplay -l. so therfore, i think alsa couldn't detect my sound cards . is there solution to this problem? it could be better,if alsa would channel output from multiple sound cards ? how should install and configure alsa such that detects HDMI cable as soon i connect to my HD tv? is it possible to alsa and pluseaudio 2.0 to co-exist, if so how?

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• Cannot connect to wireless network

  - by smr

  I am quite new to using Ubuntu 12.10. All I remember while installing Ubuntu 12.10 was that I didn't check any box specifically to enable wireless connectivity. I tried looking into the various questions posted here - most of them refer to certain commands (redundantly sudo) and things of that sort. I am quite new and wasn't sure of understanding what those commands were trying to do (the network configuration settings - showed up different options, like 'Wireless', 'Wired', 'IPv4', 'IPv6' etc -- I am not sure of what sort of settings are to be made - like for example what sort of 'WEP' settings etc are to be made. Although I wasn't able to connect to the wireless network, I was able to connect to the internet, once I plugged in the ethernet cable. Can someone help me with: 1) Understandng a way to see if Ubuntu is configured to connect to a wireless network. 2) If so - Getting to configure to a wireless network (setting up a new one). 3) Where in ubuntu, should I look for seeing if there are any hardware devices (such as the Broadcom wireless adapter or things of that sort - like the way we use the 'Device manager' in Windows to look into the adapter settings). 4) Reference material to learn and understand the various ubuntu commands. (things like the -lshw etc).

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• How can I fix my xvinfo?

  - by YumYumYum

  How can i fix my X server/driver? $ xvinfo X-Video Extension version 2.2 screen #0 no adaptors present Additional info: $ uname -a Linux desktop 2.6.32-33-generic #70-Ubuntu SMP Thu Jul 7 21:13:52 UTC 2011 x86_64 GNU/Linux $ lspci 00:00.0 Host bridge: Intel Corporation Device 0100 (rev 09) 00:02.0 VGA compatible controller: Intel Corporation Sandy Bridge Integrated Graphics Controller (rev 09) 00:16.0 Communication controller: Intel Corporation Cougar Point HECI Controller #1 (rev 04) 00:19.0 Ethernet controller: Intel Corporation Device 1503 (rev 05) 00:1a.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #2 (rev 05) 00:1b.0 Audio device: Intel Corporation Cougar Point High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 1 (rev b5) 00:1c.1 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 2 (rev b5) 00:1c.3 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 4 (rev b5) 00:1d.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation Device 1c4a (rev 05) 00:1f.2 SATA controller: Intel Corporation Cougar Point 6 port SATA AHCI Controller (rev 05) 00:1f.3 SMBus: Intel Corporation Cougar Point SMBus Controller (rev 05) 01:00.0 PCI bridge: Integrated Technology Express, Inc. Device 8892 (rev 10) 04:00.0 USB Controller: NEC Corporation Device 0194 (rev 04) Follow up: It seems in 64-bit its a mess doing existing approach. Therefore, after upgrading to 12.04 64-bit this problems in same hardware is resolved (of-course, i have now other drivers problem)

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• Are specific types still necessary?

  - by MKO

  One thing that occurred to me the other day, are specific types still necessary or a legacy that is holding us back. What I mean is: do we really need short, int, long, bigint etc etc. I understand the reasoning, variables/objects are kept in memory, memory needs to be allocated and therefore we need to know how big a variable can be. But really, shouldn't a modern programming language be able to handle "adaptive types", ie, if something is only ever allocated in the shortint range it uses fewer bytes, and if something is suddenly allocated a very big number the memory is allocated accordinly for that particular instance. Float, real and double's are a bit trickier since the type depends on what precision you need. Strings should however be able to take upp less memory in many instances (in .Net) where mostly ascii is used buth strings always take up double the memory because of unicode encoding. One argument for specific types might be that it's part of the specification, ie for example a variable should not be able to be bigger than a certain value so we set it to shortint. But why not have type constraints instead? It would be much more flexible and powerful to be able to set permissible ranges and values on variables (and properties). I realize the immense problem in revamping the type architecture since it's so tightly integrated with underlying hardware and things like serialization might become tricky indeed. But from a programming perspective it should be great no?

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• Ubuntu 3D does not work on Dell system with a AMD Radeon HD 6470M

  - by VeeKay

  I am running 64 bit Ubuntu on Dell with 1GB graphic card. I login with "Ubuntu" hoping to see Unity 3d but it doesn't. Unity 2D runs instead. when I type in echo "$DESKTOP_SESSION" it confirms the Unity-2D. I've checked the System info that shows like : The graphics row shows itself as empty. SO I've presumed that the graphic drivers aren't detected and hence I went to Unity- Additional Drivers and installed the fglrx driver that the UI has suggested. Even after installing so, the graphics part in System info details shows nothing and still Unity 2D runs in spite of all the effort. Please help! How can I get my Unity 3D back? Hardware Info Video Card : AMD Radeon™ HD 6470M - 1GB (For ICC) RAM : 6GB (1 X 2GB + 1 X 4GB) 2 DIMM DDR3 1333Mhz OS : 64 bit Ubuntu 11.10 Edit : Output for /usr/lib/nux/unity_support_test -p X Error of failed request: BadRequest (invalid request code or no such operation) Major opcode of failed request: 155 (GLX) Minor opcode of failed request: 19 (X_GLXQueryServerString) Serial number of failed request: 21 Current serial number in output stream: 21

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• Web hosting company basically forces me to use their domain name [closed]

  - by Jinx

  I've recently stumbled upon an unusual problem with one of hosting companies called giga-international.com. Anyway, I've ordered com.hr domain from Croatian domain name registration company, and my client insisted on using this host provider as couple of his friends already are hosted with them. I thought something was fishy when the first result on Google for Giga International was this little forum rant instead of their webpage. When I was checking their services they listed many features etc... space available, bandwidth etc. I just wanted to check how much ram do I get for my PHP scripts so I emailed them, and they told me that was company secret. Seriously? Anyway, since my client still insisted on hosting with them I've bought their Webspace package. During registration I had to choose free domain name because I couldn't advance registration without it. Nowhere was said, not even in general terms and conditions that I wouldn't be able to change that domain name. At least not for double the price of domain name per year. They said I can either move my domain name over to them (and pay them domain registration), or pay them 1 Euro per month for managing a DNS entry. On any previous hosting solution I was able to manage my domain names just by pointing my domain to their name servers, and this is something completely new and absurd for me. They also said that usual approach is not possible because of security and hardware limitations. I'd like to know what you guys think about this case, and should I report, and where should I report this case. In short. They forced me to register free domain name which doesn't suit my needs in order to register for their webspace package, and refuse to change domain name for my account until I either transfer domain to them or pay them DNS management which costs double the price of the domain name per year.

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• Can't boot from USB - 11.04 / Exopc

  - by Charles

  I can't find the answer to this anywhere. I am new to Ubuntu, please help! I have a wetab, except now I don't, because I put Ubuntu 10.10 over the top of it (meant to dual boot, but that's another story). I upgraded to 11.04 out of curiosity. It's good, but not for touchscreen tablets - no multi touch for example. I want to get back the wetab OS now. I have all the files, and I have a bootable gparted USB stick. The problem is I can't seem to boot from USB. The "wetab" PC is actually an ExoPC, so it has only the hardware button and a soft button in the top corner. Using the wetab OS method of reaching BIOS with the hard and soft buttons doesn't work now, I only get a menu asking if I want to run Ubuntu in recovery mode, run a limited command line, or do a memory check. I need to either repartition the drive so I can dual boot with WeTabOS, or just wipe over Ubuntu and start again. How do I do this? I have also tried hammering F11, Del, F8, F1, many other combinations! Edit: I do have access to USB keyboard and mouse

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• 12.04 Taking forever for no apparent reason

  - by Sam

  First off, I'd just like to say how much I'm loving Ubuntu so far. It's one of my first steps into Linux, but so far it's blown away Windows in almost every regard. Now, onto my problem. My brothers have some old Dell Dimensions that are barely clinging to life. They were both running XP Home Premium. The 2400 installed just fine, no issues at all. Now, the other computer, the 3000 isn't clearing the screen with the Ubuntu logo and the pulsing dots. I've tried multiple discs, including the exact same one that gave me no issue in the other computer, and I'm at a loss. Does anyone have any suggestions as to where the problem might lay? They're both 32 bit Intel processors, and it's the correct version of Ubuntu. Is it a bad disc drive? Hardware incompatibility? Thanks for any assistance that can be provided. Dell Dimension 2400 Dell Dimension 3000

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• TechEd 2012: Fast SQL Server

  - by Tim Murphy

  While I spend a certain amount of my time creating databases (coding around SQL Server and setup a server when I have to) it isn’t my bread and butter.  Since I have run into a number of time that SQL Server needed to be tuned I figured I would step out of my comfort zone and see what I can learn. Brent Ozar packed a mountain of information into his session on making SQL Server faster.  I’m not sure how he found time to hit all of his points since he was allowing the audience abuse him on Twitter instead of asking questions, but he managed it.  I also questioned his sanity since he appeared to be using a fruit laptop. He had my attention though when he stated that he had given up on telling people to not use “select *”. He posited that it could be fixed with hardware by caching the data in memory.  He continued by cautioning that having too many indexes could defeat this approach.  His logic was sound if not always practical, but it was a good place to start when determining the trade-offs you need to balance.  He was moving pretty fast, but I believe he was prescribing this solution predominately for OLTP database prior to moving on to data warehouse solutions. Much of the advice he gave for data warehouses is contained in the Microsoft Fast Track guidance so I won’t rehash it here.  To summarize the solution seems to be the proper balance memory, disk access speed and the speed of the pipes that get the data from storage to the CPU.  It appears to be sound guidance and the session gave enough information that going forward we should be able to find the details needed easily.  Just what the doctor ordered. del.icio.us Tags: SQL Server,TechEd,TechEd 2012,Database,Performance Tuning

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• WIFI looses connection with AR9285 - have to disconnect / connect to regain internet?

  - by CodyLoco

  I have a G73JW laptop using Ubuntu 12.04. It has an Atheros AR9285 card. While wifi seems to work fine most of the time, about every hour or two it will loose the connection to the internet. The connection will appear to be connected still to the wireless router, but internet access is gone. Disconnecting and reconnecting to the access point solves the problem, as does disabling and reenabling the adapter via the hardware keyboard shortcut. How might this be solved so the connection is stable and doesn't drop? EDIT: It looks like the network dropping isn't related to DNS as it fails either way: codyloco@CodyLoco-Ubuntu:~$ dig askubuntu.com @8.8.8.8 ; <<>> DiG 9.8.1-P1 <<>> askubuntu.com @8.8.8.8 ;; global options: +cmd ;; connection timed out; no servers could be reached codyloco@CodyLoco-Ubuntu:~$ dig askubuntu.com ; <<>> DiG 9.8.1-P1 <<>> askubuntu.com ;; global options: +cmd ;; connection timed out; no servers could be reached Again cycling (disabling / enabling) the adapter corrects the issue.

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• loss of sound in ubuntu 12.04

  - by Leo Simon

  I'm running Linux E6520 3.2.0-56-generic #86-Ubuntu SMP Wed Oct 23 09:20:45 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux on a Dell Latitude E6530. (This is a new machine; have run the same version of linux on an older machine for a year, without this happening.) I've been losing sound regularly, though have not been able to isolate the trigger for this. I've scoured the web on this subject, in particular https://help.ubuntu.com/community/SoundTroubleshootingProcedure and Audio stopped working suddenly in 12.04 Nothing from the first site seemed to work for me. From the second site, I learned enough to be able to fix the problem when it happens, but nothing on the web has helped me figure out why the problem is happening in the first place. Patching together stuff from the web, and with some blind luck, I've found that the following steps seem to restore sound pulseaudio --kill pulseaudio --start pavucontrol -> output devices Click on the "Mute audio" icon, which mutes audio Click on the "Mute audio" icon, which unmutes audio. This obviously doesn't make sense: audio wasn't muted in the first place, but somehow, magically, toggling mute audio off and on seems to reset something. Can anybody suggest from this information why sound would be disappearing in the first place (it seems as though something is getting muted at the system level, but I don't know what)? a simpler (command-line/script) way of restoring sound, in particular, is it possible to reset pavucontrol from the commandline? Some other pieces of information that may be of use: The problem is clearly happening at the system level, since I've set up a clean new user, and this user has the same problems that I do. So user fixes like deleting the .pulse directory aren't (and don't) help. Sound works fine in Windows (dual-boot) so it's not a hardware problem Any help/suggestions on this would be most appreciated.

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• Impact of Server Failure on Coherence Request Processing

  - by jpurdy

  Requests against a given cache server may be temporarily blocked for several seconds following the failure of other cluster members. This may cause issues for applications that can not tolerate multi-second response times even during failover processing (ignoring for the moment that in practice there are a variety of issues that make such absolute guarantees challenging even when there are no server failures). In general, Coherence is designed around the principle that failures in one member should not affect the rest of the cluster if at all possible. However, it's obvious that if that failed member was managing a piece of state that another member depends on, the second member will need to wait until a new member assumes responsibility for managing that state. This transfer of responsibility is (as of Coherence 3.7) performed by the primary service thread for each cache service. The finest possible granularity for transferring responsibility is a single partition. So the question becomes how to minimize the time spent processing each partition. Here are some optimizations that may reduce this period: Reduce the size of each partition (by increasing the partition count) Increase the number of JVMs across the cluster (increasing the total number of primary service threads) Increase the number of CPUs across the cluster (making sure that each JVM has a CPU core when needed) Re-evaluate the set of configured indexes (as these will need to be rebuilt when a partition moves) Make sure that the backing map is as fast as possible (in most cases this means running on-heap) Make sure that the cluster is running on hardware with fast CPU cores (since the partition processing is single-threaded) As always, proper testing is required to make sure that configuration changes have the desired effect (and also to quantify that effect).

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• How to identify web development benchmarking questions? [closed]

  - by GenericJam

  I am in my final year of college and I have to put forward some sort of thesis for my final year project. The project is a web based attendance system that I am building for the college. I have it about 70% complete in Java. After completing it in Java, the plan is for me to rewrite the server bit in Erlang and then release the bitter rivals in a head to head cage match. The idea being that there is some sort of grounds for comparison. There are a few hurdles along the way, such as me learning Erlang. I understand that a performance comparison like this isn't strictly scientific as there are many factors such as the programmer (myself); the hardware it runs on; etc... but it is meant to be a reasonable comparison of the merits of using Java vs. Erlang for web development. I need help in identifying what the relevant questions are that my project could address. Even though the project scope is fixed, I am trying to shoehorn in some worthwhile scientific inquiries.

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• Oracle Enterprise Manager 12c Testing-as-a-Service Solution

  - by user810030

  With organizations spending as much as 50 percent of their QA time with non-test related activities like setting up hardware and deploying applications and test tools, the cloud will bring obvious benefits. A key component of Oracle Enterprise Manager our current Application Quality Management products have been helping our customers with application load testing, functional testing and test process management, but also test data management, data masking and real application testing. These products enable customers to thoroughly test applications and their underlying infrastructure to help ensure the best quality, scalability and availability prior to deployment.  Today, Oracle announced Oracle Enterprise Manager 12c Testing-as-a-Service Solution . This solution will allow users to significantly decrease the time needed to setup a complete test environment, while enhancing testing efficiency. Please read the Press Release mentioned above and join us in our Enterprise Manager LinkedIn Group discussion on this topic. (need to be a member). Or visit our booth this week during the EuroSTAR Software Testing conference in Amsterdam where we can demo this solution  I hope you find this helpfull Stay Connected: Twitter |  Facebook |  YouTube |  Linkedin |  Newsletter

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• I cannot boot Ubuntu from WUBI install with windows 7, get an error message every time

  - by Tom

  i have tried several times to install ubuntu using wubi, i can't use a disc as i have a notebook computer and there is no optical drive. the download and installation all seem to work well but whenever i try to boot ubuntu at the windows 7/ubuntu menu it comes up with this error screen. I have used both the C: drive and the D: drive to install Ubuntu several times each, it's always unsuccessful. "Windows has failed to start. a recent hardware or software change might be the cause. To fix the problem: Insert your windows installation disc and restart your computer Choose your language settings and then click 'next' Click repair your computer. If you do not have this disc, contact your system administrator or computer manufacturer for assistance. File: \ubuntu\winboot\wubildr.mbr Status: 0xc000000F Info: The selected entry could not be loaded because the application is missing or corrupt." I use an ASUS x501a with windows 7. What do i do to fix this? I want to be able to dual boot Windows 7 and ubuntu. Thanks a lot :)

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• Random compositing lag

  - by user1020567

  My laptop specs: 512 mb of RAM, out of which 64 mb are shared with an integrated GPU - ATI Radeon Xpress 200 M. Intel 1,6 Ghz Celeron M single-core processor. I've spent months trying to figure out why compositing and effects sometimes lag on any distro I try. Now I've come to realise that no matter what drivers I try (the default ones work for me on pretty much any linux) compositing lag is random. When I used Ubuntu 10.10, for example, sometimes window compositing would lag and sometimes it wouldn't. The PC is able to render those effects so hardware is not the problem. It's completely random and unpredictable - sometimes when I turn on the computer the effects lag horribly and sometimes it's completely smooth. I've also checked startup items and there doesn't seem to be any unnecessary entries. I also tried building my own OS with Arch Linux and the problem persists there, therefore I can only assume that it's a driver issue of some sort. By default there are lots of drivers supplied with linux distributions. Could it be that they're in the way? The ones that I need are ati/radeon (or both? What's the difference between them?) and there seem to be a lot of others... What should I do?

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