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• Instruction vs data cache usage

  - by Nick Rosencrantz

  Say I've got a cache memory where instruction and data have different cache memories ("Harvard architecture"). Which cache, instruction or data, is used most often? I mean "most often" as in time, not amount of data since data memory might be used "more" in terms of amount of data while instruction cache might be used "more often" especially depending on the program. Are there different answers a) in general and b) for a specific program?

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• SIMD Extensions for the Database Storage Engine

  - by jchang

  For the last 15 years, Intel and AMD have been progressively adding special purpose extensions to their processor architectures. The extensions mostly pertain to vector operations with Single Instruction, Multiple Data (SIMD) concept. The reasoning was that achieving significant performance improvement over each successive generation for the general purpose elements had become extraordinarily difficult. On the other hand, SIMD performance could be significantly improved with special purpose registers...(read more)

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• SIMD Extensions for the Database Storage Engine

  - by jchang

  For the last 15 years, Intel and AMD have been progressively adding special purpose extensions to their processor architectures. The extensions mostly pertain to vector operations with Single Instruction, Multiple Data (SIMD) concept. The motivation was that achieving significant performance improvement over each successive generation for the general purpose elements had become extraordinarily difficult. On the other hand, SIMD performance could be significantly improved with special purpose registers...(read more)

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• HP Pavilion G6 1209 temperature higher than usual and fan working in 11.10

  - by vanjadjurdjevic

  Installing Ubuntu on this new machine i had various problems, so I asked around ask ubuntu for a solution. This is the latest one! :D When I start the pc it shows the temperature around 50-55. When I open chromium it shows 60+ (61,62,63). It even gets to 67-68 when multi-tasking 2 apps. The fan is working slightly louder than in windows 7. Talking about windows 7, the temperature is 45-50 when idle, 50-53 when working in browser. Im already loosing it with this machine. You can find specs here It says 'technishe daten' below the picture. Click that tab and you will reach the specs.

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• Rendering a DOM across multiple displays

  - by meetamit

  I'm building a data-driven animation with HTML and javascript to run in a web browser. I would like to display it tiled across three 1080p monitors. This essentially yields a viewport that's 5760px wide and 1080px tall. Pretty large. Does anyone have experience setting up something like this? I have many questions below, but any tip would be appreciated: Is it reasonable to expect a DOM to render into such a large viewport size at close to 60fps? I might choose to use canvas, instead of SVG or HTML, but that would yield a giant canvas. Can a canvas with such high resolution be performant? Of course everything depends on the complexity of the graphics I want to render, but I'm looking to remove that factor from this question, so assume I'm asking about a canvas animation that can run at 60fps at 1920x1080 resolution. Would it run roughly as fast at 3 times the width? Would three.js and WebGL be a more proper approach at that resolution? How do you actually cause Chrome or FF to span 3 monitors at full screen? Do I need a 3rd party solution of any kind? Thanks!

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• What can I change/investigate where the install does not complete?

  - by tunist

  I have already successfully installed Ubuntu 10.10 on my laptop and it works fine. I attempted to get my desktop PC to dual boot Windows and Ubuntu but found that neither the 32 or 64 bit install images will boot/install successfully. The startup script locks on 'initializing core #2' (or 1 or 3).. once I saw it say 'ok' at the end but it still locks there. I have tried to change the boot sequence by inserting 'debug' and 'acpi-off' into txt.cfg in both isolinux and syslinux folders but no changes were obvious during the boot.. as far as it got. The pc is built with an abit IP35 motherboard and nvidia 8600GT gfx card. Does anyone have any suggestion of what else I can change to get the install working?

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• How often do CPUs make calculation errors?

  - by veryfoolish

  In Dijkstra's Notes on Structured Programming he talks a lot about the provability of computer programs as abstract entities. As a corollary, he remarks how testing isn't enough. E.g., he points out the fact that it would be impossible to test a multiplication function f(x,y) = x*y for any large values of x and y across the entire ranges of x and y. My question concerns his misc. remarks on "lousy hardware". I know the essay was written in the 1970s when computer hardware was less reliable, but computers still aren't perfect, so they must make calculation mistakes sometimes. Does anybody know how often this happens or if there are any statistics on this?

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• .NET processing unit [closed]

  - by configurator

  Do you think we'll ever see an IL (or other bytecode) processing unit? It sounds possible and would have a major benefit, because we wouldn't need the JITter. This isn't the same as compiling .NET directly to machine code, since the bytecode here is designed to be programmed and disassembled easily, unlike the bytecode used in x86 processors which is designed to work faster. What's stopping Intel (for example) from partnering with Microsoft and making such a .NET-optimised processor?

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• Is there anything software-related I can do, to make ubuntu play high-quality mkv files smoothely?

  - by Roy

  I've noticed that beyond let's say..a 20 MB/s bitrate, a movie would lag, played on my laptop.. It results in me missing the highest bitrated scenes of a movie.. And sometimes having to compromise for watching the movie at a lesser quality.. I was wondering if there's anything I can do software-wise to play movies smoothley..? At the moment Ubuntu is installed with all the default settings on an 60GB SSD I use VLC ofcourse.. I also have 2 1TB HDD - maybe I can use them as pagefiles? I don't really know alot about this so maybe this is irrelevant.. I took the laptop battery out since it was dead..but I think this is also irrelevant.. would appriciate a response, even if there's nothing that can be done software-wise :)

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• Why Are We Still Using CPUs Instead of GPUs?

  - by Jason Fitzpatrick

  Increasingly GPUs are being used for non-graphical tasks like risk computations, fluid dynamics calculations, and seismic analysis. What’s to stop us from adopting GPU-driven devices? Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. 6 Ways Windows 8 Is More Secure Than Windows 7 HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8

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• MSbuild task fails because "Any CPU" solution is built out of order

  - by Art Vandalay

  I have two solutions to build in Teambuild, one is the application itself, the other one is the WiX installer. I want to build the application using "Any CPU" build configuration and the installer using "x86". I've listed the "Any CPU" solution first in my project file, but Teambuild always builds the "x86" solution first. I'm setting BuildSolutionsInParallel = false, but it still builds the solutions in the reverse listed order. If I change the first solution to "Mixed Platform", it works fine. How can I get the solutions to build in the order listed in the project file? <Project ...> <PropertyGroup> <!-- We want to build the install solution after the build solution --> <BuildSolutionsInParallel>false</BuildSolutionsInParallel> </PropertyGroup> <ItemGroup> <SolutionToBuild Include="$(BuildProjectFolderPath)/Pricer/Pricer.sln"> <Targets></Targets> <Properties></Properties> </SolutionToBuild> <SolutionToBuild Include="$(BuildProjectFolderPath)/Pricer/Pricer.Install/Pricer.Install.sln"> <Targets></Targets> <Properties></Properties> </SolutionToBuild> </ItemGroup> <ItemGroup> <ConfigurationToBuild Include="Release|Any CPU"> <FlavorToBuild>Release</FlavorToBuild> <PlatformToBuild>Any CPU</PlatformToBuild> </ConfigurationToBuild> <ConfigurationToBuild Include="Release|x86"> <FlavorToBuild>Release</FlavorToBuild> <PlatformToBuild>x86</PlatformToBuild> </ConfigurationToBuild> </ItemGroup> </Project>

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• Force x86 CLR on 'Any CPU' .NET assembly

  - by jeffora

  In .NET, the 'Platform Target: Any CPU' compiler option allows a .NET assembly to run as 64bit on a x64 machine, and 32bit on an x86 machine. It is also possible to force an assembly to run as x86 on an x64 machine using the 'Platform Target: x86' compiler option. Is it possible to run an assembly with the 'Any CPU' flag, but determine whether it should be run in the x86 or x64 CLR? Normally this decision is made by the CLR/OS Loader (as is my understanding) based on the bitness of the underlying system. I am trying to write a C# .NET application that can interact with (read: inject code into) other running processes. x64 processes can only inject into other x64 processes, and the same with x86. Ideally, I would like to take advantage of JIT compilation and the Any CPU option to allow a single application to be used to inject into either x64 or x86 processes (on an x64 machine). The idea is that the application would be compiled as Any CPU. On an x64 machine it would run as x64. If the target process is x86, it should relaunch itself, forcing the CLR to run it as x86. Is this possible?

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• CPU friendly infinite loop

  - by Adi

  Writing an infinite loop is simple: while(true){ //add whatever break condition here } But this will trash the CPU performance. This execution thread will take as much as possible from CPU's power. What is the best way to lower the impact on CPU? Adding some Thread.Sleep(n) should do the trick, but setting a high timeout value for Sleep() method may indicate an unresponsive application to the operating system. Let's say I need to perform a task each minute or so in a console app. I need to keep Main() running in an "infinite loop" while a timer will fire the event that will do the job. I would like to keep Main() with the lowest impact on CPU. What methods do you suggest. Sleep() can be ok, but as I already mentioned, this might indicate an unresponsive thread to the operating system. LATER EDIT: I want to explain better what I am looking for: I need a console app not Windows service. Console apps can simulate the Windows services on Windows Mobile 6.x systems with Compact Framework. I need a way to keep the app alive as long as the Windows Mobile device is running. We all know that the console app runs as long as its static Main() function runs, so I need a way to prevent Main() function exit. In special situations (like: updating the app), I need to request the app to stop, so I need to infinitely loop and test for some exit condition. For example, this is why Console.ReadLine() is no use for me. There is no exit condition check. Regarding the above, I still want Main() function as resource friendly as possible. Let asside the fingerprint of the function that checks for the exit condition.

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• Project builds skipped with Any CPU build platform

  - by JMarsch

  All: We are using Visual Studio 2010, and we have recently upgraded our workstations to Windows 7/64-bit. I have a question: When I create a new solution, it seems to want to use the x86 platform. If I change the solution to "any cpu" and then I add a new project to the solution, the project will not have an "any cpu" build option, and it will be deselected from building (in configuration manager). Something seems wrong here. Here's what I want to have (assuming that it is supported): I want my solutions' platforms to default to "Any CPU" (I believe that means that at JIT time, the assembly will be either x86 or 64-bit, based on the machine that loaded it). When I add a new project to the solution, I want for it to have an "any cpu" solution, and I want for that projec to build by default. (basically, the same behavior that we had in VS 2008 on 32-bit workstations). How do I do that? Is there some additional thing that I need to know now that I am using a 64-bit workstation?

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• CPU overheating because of Delphi IDE

  - by Altar

  I am using Delphi 7 but I have trialed the Delphi 2005 - 2010 versions. In all these new versions my CPU utilization is 50% (one core is 100%, the other is "relaxed") when Delphi IDE is visible on screen. It doesn't happen when the IDE is minimized. My computer is overheating because of this. Any hints why this happens? It looks like if I want to upgrade to Delphi 2010, I need to upgrade my cooling system first. And I am a bit lazy about that, especially that I want to discahrge my computer and buy a new one (in the next 6 months) - probably I will have to buy a Win 7 license too. Edit: My CPU is AMD Dual Core 4600+. 4GB RAM Overheating means that temperature of the HDDs is raising because the CPU. Edit: Comming to a possible solution I just deleted all HKCU/CodeGear key and let started Delphi as "new". Guess what? The CPU utilization is 0%. I will investigate more.

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• Difference between "machine hardware" and "hardware platform"

  - by Adil

  My Linux machine reports "uname -a" outputs as below:- [root@tom i386]# uname -a Linux tom 2.6.9-89.ELsmp #1 SMP Mon Apr 20 10:34:33 EDT 2009 i686 i686 i386 GNU/Linux [root@tom i386]# As per man page of uname, the entries "i686 i686 i386" denotes:- machine hardware name (i686) processor type (i686) hardware platform (i386) Additional info: [root@tom i386]# cat /proc/cpuinfo <snip> vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Xeon(R) CPU 5148 @ 2.33GHz stepping : 6 cpu MHz : 2328.038 cache size : 4096 KB </snip>

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• applet does not load

  - by jcp

  We have a legacy program that was ported from Java 1.3 to Java 1.5. This application involves applets which worked fine before. After porting however, the applet would not load. However there are no errors or exceptions. The app would just try to load it forever. We tried to run it with Java 1.6 and poof! No problems whatsoever. Isn't Java 6 backwards compatible? So how come it would run in that version and not in 1.5? ==== Java Console log for Java 1.5.0_19 basic: Registered modality listener basic: Registered modality listener basic: Registered modality listener liveconnect: Invoking JS method: document liveconnect: Invoking JS method: document liveconnect: Invoking JS method: document liveconnect: Invoking JS method: URL liveconnect: Invoking JS method: URL liveconnect: Invoking JS method: URL basic: Referencing classloader: sun.plugin.ClassLoaderInfo@bb7759, refcount=1 basic: Referencing classloader: sun.plugin.ClassLoaderInfo@bb7759, refcount=2 basic: Referencing classloader: sun.plugin.ClassLoaderInfo@bb7759, refcount=3 basic: Added progress listener: sun.plugin.util.GrayBoxPainter@b0bad7 basic: Loading applet ... basic: Initializing applet ... basic: Starting applet ... basic: Added progress listener: sun.plugin.util.GrayBoxPainter@ba9340 basic: Added progress listener: sun.plugin.util.GrayBoxPainter@1198891 basic: Loading applet ... basic: Initializing applet ... basic: Starting applet ... basic: Loading applet ... basic: Initializing applet ... basic: Starting applet ... basic: Referencing classloader: sun.plugin.ClassLoaderInfo@bb7759, refcount=4 basic: Releasing classloader: sun.plugin.ClassLoaderInfo@bb7759, refcount=3 basic: Referencing classloader: sun.plugin.ClassLoaderInfo@bb7759, refcount=4 basic: Releasing classloader: sun.plugin.ClassLoaderInfo@bb7759, refcount=3 basic: Referencing classloader: sun.plugin.ClassLoaderInfo@bb7759, refcount=4 basic: Releasing classloader: sun.plugin.ClassLoaderInfo@bb7759, refcount=3 network: Connecting <something>.jar with proxy=HTTP @ proxy/<ip address> basic: Loading <something>.jar from cache basic: No certificate info, this is unsigned JAR file. Left START init() Left END init() Right START init() Control start() Waiting for Left Panel to load... Right START start() network: Connecting socket://<ip address>:14444 with proxy=DIRECT Control start() Waiting for Left Panel to load... Control start() Waiting for Left Panel to load... Control start() Waiting for Left Panel to load... my HostName : <ip address> Thread-19 Check : Thread-19 Check : Monitor : run : start Thread-20 Monitor : Monitor: run() start Control start() Waiting for Left Panel to load... Control start() Waiting for Left Panel to load... Control start() Waiting for Left Panel to load... Control start() Waiting for Left Panel to load... Control start() Waiting for Left Panel to load... Control start() Waiting for Left Panel to load... the last message goes on forever... and now with the working version: ==== Java Console log for Java 1.6.0_15 basic: Added progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@1b000e7 basic: Added progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@12611a7 basic: Added progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@1807ca8 network: CleanupThread used 6 us network: CleanupThread used 5 us network: CleanupThread used 6 us cache: Skip blacklist check as cached value is ok. network: Cache entry found [url: <something>.jar, version: null] network: Connecting <something>.jar with proxy=HTTP @ proxy/<ip address> network: ResponseCode for <something>.jar : 304 network: Encoding for <something>.jar : null network: Disconnect connection to <something>.jar Reading certificates from 11 <something>.jar | <something>.idx network: No certificate info for unsigned JAR file: <something>.jar basic: Applet loaded. basic: Applet loaded. basic: Applet resized and added to parent container basic: Applet resized and added to parent container basic: PERF: AppletExecutionRunnable - applet.init() BEGIN ; jvmLaunch dt 330275 us, pluginInit dt 27768955 us, TotalTime: 28099230 us Right START init() basic: PERF: AppletExecutionRunnable - applet.init() BEGIN ; jvmLaunch dt 330275 us, pluginInit dt 27770563 us, TotalTime: 28100838 us Left START init() basic: Applet loaded. basic: Applet resized and added to parent container basic: PERF: AppletExecutionRunnable - applet.init() BEGIN ; jvmLaunch dt 330275 us, pluginInit dt 27779332 us, TotalTime: 28109607 us Left END init() basic: Applet initialized basic: Removed progress listener: sun.plugin.util.GrayBoxPainter$GrayBoxProgressListener@12611a7 basic: Applet made visible And that's it. Still haven't figured out why it works with java6 and not java5. @valli: the object tag was used, not applet @thorbjorn: i tried that already... it just keeps saying loading applet... @aaron: how can i know what exception it is, if there really is one? and yes we have considered that its a java bug but i still havent found what that bug is. i have to submit a report tomorrow and i've scoured the net but came up with nothing as of yet... @all: thank you for your replies

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• require wp-load.php 3 directories back

  - by sman591

  I'm trying to include a file (/wp-load.php) at the beginning of the /html/ directory. I'm trying to include it from /wp-content/themes/pw-steel-orange/index-load.php, but I always get the error message Warning: require_once(../wp-load.php) [function.require-once]: failed to open stream: No such file or directory in /nfs/c07/h01/mnt/102799/domains/platyworld.com/html/wp-content/themes/pw-steel-orange/index-load.php on line 1 Fatal error: require_once() [function.require]: Failed opening required '../wp-load.php' (include_path='.:/usr/local/php-5.2.6-1/share/pear') in /nfs/c07/h01/mnt/102799/domains/platyworld.com/html/wp-content/themes/pw-steel-orange/index-load.php on line 1 Am I doing something wrong? I though ../ brings the includes to the beginning directory Sorry if this is a duplicate, I couldn't find something related to this in my searches...

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• "rake test" doesn't load fixtures?

  - by Pavel K.

  when i run rake test --trace here's what happens ** Invoke test (first_time) ** Execute test ** Invoke test:units (first_time) ** Invoke db:test:prepare (first_time) ** Invoke db:abort_if_pending_migrations (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:abort_if_pending_migrations ** Execute db:test:prepare ** Invoke db:test:load (first_time) ** Invoke db:test:purge (first_time) ** Invoke environment ** Execute db:test:purge ** Execute db:test:load ** Invoke db:schema:load (first_time) ** Invoke environment ** Execute db:schema:load ** Execute test:units /usr/bin/ruby1.8 -I"lib:test".... (and after that fails because there's no fixtures loaded) why doesn't it load fixtures (i thought that would be default behaviour) and how do i make it load fixtures before executing tests??? p.s. my test/test_helper.rb content is: ENV["RAILS_ENV"] = "test" require File.expand_path(File.dirname(__FILE__) + "/../config/environment") require 'test_help' class ActiveSupport::TestCase self.use_transactional_fixtures = true self.use_instantiated_fixtures = false fixtures :all end (rails 2.3.4)

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• User class - 'load' data

  - by John

  <?php class User { private $id; private $username; public function __construct($id = null) { $this->id = $id; if (!is_null($this->id)) { $this->load(); } } public function load() { } } ?> In the 'load' method I am going to load all the information from the current user (id) But I wonder how is the best way to load all info. I could grab all data and then just assign all private variables, but I assume there must be another "cheaper" way to get all the data so I can use as such $this-variable; And not have to ASSIGN every single data row, I select in the load method. How?

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• PHP hits 100% CPU and eats RAM at the same time Monday to Friday

  - by Daniel Samuels

  We run a learning platform for primary schools here in the UK and it's all been running extremely well. However at around 4PM Monday to Friday we see the same issue arise -- 1-2 PHP threads will spike to 100% CPU and gradually start eating up RAM until the server(s) fall over. 98%+ of our requests are HTTPS, these come into our Layer 7 load balancer which then decrypts the SSL data, adds the X-HTTP-Forwarded-For header and forwards the data onto an application server (we have 2 of those at the moment) on port 80. Our application servers have Varnish on port 80 which takes in the request from the load balancer and passes the request through to Nginx on port 81. Nginx then works out which 'vhost' it needs to use and passes any PHP processing through to PHP-CGI which is listening on a socket (managed through spawn-fcgi). There's an instance of Memcached running too, MySQL runs on a separate server / slave setup. Throughout the day the load will typically go no higher than 0.8 on either of the application servers, however at around 4PM our problem arises. I've managed to run strace on a few of the actual threads when they cause the problem and I always see the same thing: stat("/usr/share/zoneinfo/Europe/London", {st_mode=S_IFREG|0644,st_size=3661, ...}) = 0 stat("/usr/share/zoneinfo/Europe/London", {st_mode=S_IFREG|0644,st_size=3661, ...}) = 0 This is repeated infinitely and never stops until you SEGKILL the process or oomkiller kills it. There are no cron jobs scheduled to run at that time and I don't have any way of seeing exactly what Nginx request is associated with the PHP process which is running. We are running PHP 5.3.14 which we upgraded to from 5.3.8 last week to rule out the older version being the problem. This issue has been going on a few months now and we have no idea what is causing it. We deploy our software very frequently, so it's difficult to track down a specific release which may have started the problem - especially as we do not know the date of the first occurrence of this issue. Varnish is version 3.0.1, Nginx is 1.0.6 (which I understand is about a year old now), our servers are running CentOS release 5.7 (Final) they have Intel i3 540s at 3.07Ghz and 8GB of RAM. There's a discussion on the Debian mailing list about something very similar, you can find that here. Has anyone seen anything like this in the past, does anyone have any ideas or suggestions? Are there a way of linking an Nginx request directly to a PHP thread? Is there a better way of seeing what the PHP process is doing? (I've seen GDB mentioned, though I'll have to recompile PHP) Thanks!

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• Cannot get Virtualbox to install properly on Ubuntu 12.04

  - by lopac1029

  I cannot get Virtualbox to install properly on my 12.04. I first went with a manual install for the .deb from the old builds section of the Virtualbox page. That .deb opened up the Software Center and installed. Then I got the error coming up of VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot. which I can only assume was due to my Ubuntu version being 32-bit (System Details - Overview - OC type: 32-bit, right?) So I followed these instructions to remove the .deb manually, restarted my laptop, and then FOUND the actual Virtualbox install in the Software Center and installed from that (assuming it would give me the correct version I need for my system) So after all that (and then some), I'm still getting the same error when I connect to my new job's project in Virtualbox. Can anyone point me in the right direction of what to do here? This is the first time I've ever worked with Virtualbox, and no one at this company is using Ubuntu, so I'm on my own here. EDIT: Here is the direct info from running the 2 suggested commands Inspiron-1750-brick:~ $lscpu Architecture: i686 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 2 On-line CPU(s) list: 0,1 Thread(s) per core: 1 Core(s) per socket: 2 Socket(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 23 Stepping: 10 CPU MHz: 2100.000 BogoMIPS: 4189.45 L1d cache: 32K L1i cache: 32K L2 cache: 2048K Inspiron-1750-brick:~ $cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T6500 @ 2.10GHz stepping : 10 microcode : 0xa07 cpu MHz : 1200.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep 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 est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm dtherm bogomips : 4189.80 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T6500 @ 2.10GHz stepping : 10 microcode : 0xa07 cpu MHz : 1200.000 cache size : 2048 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 : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep 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 est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm dtherm bogomips : 4189.45 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:

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• High CPU usage when running several "java -version" in parallel

  - by Prateesh

  This is just out of curiosity to understand i have a small shell script for ((i = 0; i < 50; i++)) do java -version & done when i run this my CPU usage report by sar is as below 07:51:25 PM CPU %user %nice %system %iowait %steal %idle 07:51:30 PM all 6.98 0.00 1.75 1.00 0.00 90.27 07:51:31 PM all 43.00 0.00 12.00 0.00 0.00 45.00 07:51:32 PM all 86.28 0.00 13.72 0.00 0.00 0.00 07:51:33 PM all 5.25 0.00 1.75 0.50 0.00 92.50 As you can see, on the third line the CPU is at 100% My java version is 1.5.0_22-b03.

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• WinForms app config manager is x86 and cannot reference assemblies that targets Any CPU

  - by ivos

  Hi I'm using Win7 64x and Visual Studio 2010. I created a library/framework targeting Any CPU. Then I created a new WinForms project that uses that framework, leaving the default values of the wizard. I mean, I didn't change anything. When I reference my framework, VS cannot find the assemblies. If I go to the project properties, it is targeting Any CPU (as expected, I can change it if I want). But if I go to Configuration Manager, the only choice I have for that project is x86. And I guess that is the problem. I tried to add Any CPU as a new Target but I was unable to. Could someone help me? :) Thanks in advance!

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• ScheduledThreadPoolExecutor executing a wrong time because of CPU time discrepancy

  - by richs

  I'm scheduling a task using a ScheduledThreadPoolExecutor object. I use the following method: public ScheduledFuture<?> schedule(Runnable command, long delay,TimeUnit unit) and set the delay to 30 seconds (delay = 30,000 and unit=TimeUnit.MILLISECONDS). Sometimes my task occurs immediately and other times it takes 70 seconds. I believe the ScheduledThreadPoolExecutor uses CPU specific clocks. When i run tests comparing System.currentTimeMillis(), System.nanoTime() [which is CPU specific] i see the following schedule: 1272637682651ms, 7858346157228410ns execute: 1272637682667ms, 7858386270968425ns difference is 16ms but 4011374001ns (or 40,113ms) so it looks like there is discrepancy between two CPU clocks of 40 seconds How do i resolve this issue in java code? Unfortunately this is a clients machine and i can't modify their system.

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