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  • cpu floating operations cost

    - by wiso
    I'm interesting in the time cost on a modern desktop cpu of some floating point operations in order to optimize a mathematical evaluation. In particular I'm interested on the comparison between complex operations like exp, log and simple operation like +, *, /. I tried to search for these information, but I can't find a source.

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  • Determining CPU usage in WinCE

    - by Chris
    I want to be able to get the current % CPU usage in a C++ program running under Wince. I found this link that states where the source code is but I cannot find it in my platform builder installation - I expect this is because it isn't the Windows Automotive platform. Does anyone know where I can find this source code or (even better) know how I can get this information directly? i.e. what DLL / function calls to make etc.

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  • Virtual Machine Manager 2012 CPU Average

    - by Grant
    What exactly is the CPU Average field in VMM 2012 showing me? I'm running Server 2008 R2 with VMM 2012. My server has 2x16 core CPUs installed. An example virtual machine has 4 virtual processors, and shows 20% CPU usage. Is that: 20% of the entire system's available CPU power? 20% of 4 of the 32 core's CPU power? 20% of one core's CPU? (in which case it could go as high as 400%) Something else entirely? How can I tell how much of the entire system's CPU power is being used (all 32 cores)? Edit: Well, I can tell for sure it's not 20% of the entire system's CPU power - since the entire server's CPU averages add up to well over 100% right now.

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  • How do I balance program CPU reverse compatibility whist still being able to use cutting edge features?

    - by TheLQ
    As I learn more about C and C++ I'm starting to wonder: How can a compiler use newer features of processors without limiting it just to people with, for example, Intel Core i7's? Think about it: new processors come out every year with lots of new technologies. However you can't just only target them since a significant portion of the market will not upgrade to the latest and greatest processors for a long time. I'm more or less wondering how this is handled in general by C and C++ devs and compilers. Do compilers make code similar to if SSE is supported, do this using it, else do that using the slower way or do developers have to implement their algorithm twice, or what? More or less how do you release software that takes advantage of newer processor technologies while still keeping a low common denominator?

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  • Endianness inside CPU registers

    - by Abhishek Tamhane
    I need help understanding endianness inside CPU registers of x86 processors. I wrote this small assembly program: section .data section .bss section .text global _start _start: nop mov eax, 0x78FF5ABC mov ebx,'WXYZ' nop ; GDB breakpoint here. mov eax, 1 mov ebx, 0 int 0x80 I ran this program in GDB with a breakpoint on line number 10 (commented in the source above). At this breakpoint, info registers shows the value of eax=0x78ff5abc and ebx=0x5a595857. Since the ASCII codes for W, X, Y, Z are 57, 58, 59, 5A respectively; and intel is little endian, 0x5a595857 seems like the correct byte order (least significant byte first). Why isn't then the output for eax register 0xbc5aff78 (least significant byte of the number 0x78ff5abc first) instead of 0x78ff5abc?

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  • Measuring CPU time per-thread on Windows

    - by Eli Courtwright
    I'm developing a long-running multi-threaded Python application for Windows, and I want the process to know the CPU time that each of its threads has taken. I can get the overall times for the entire process with os.times() but I need to know the per-thread times. I know that there are external tools such as the Sysinternals Process Explorer, but my program itself needs to have this information. If I were on Linux, I look in the /proc filesystem, as described here. If I were writing C code, I'd use the GetThreadTimes call, as described here. So how can I accomplish this on Windows using Python?

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  • Jquery CPU usage

    - by nharry
    I am using Jquery to make an image scroll across my page horizontally. The only problem is that it uses a serious amount of cpu usage. Up to 100% on a single core laptop in firefox. What could cause this??? Jquery <script> jQuery(document).ready(function() { $(".speech").animate({backgroundPosition: "-6000px 0px"}, 400000, null); }); </script> CSS .speech { /*position:fixed;*/ top:0; left:0px; height:400px; width:100%; z-index:-1; background:url(/images/speech.png) -300px -500px repeat-x; margin-right: auto; margin-left: auto; position: fixed; } HTML <div class="speech"></div>

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  • Cannot scale frequency of a Core i7 2720QM

    - by user51414
    I own a Dell Latitude E6520 with an Intel CPU (Core i7 2720QM). After installing cpufrequtils, I get the following message : cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009 Veuillez rapportez les erreurs et les bogues à [email protected], s'il vous plait. analyse du CPU 0 : **pas de pilotes cpufreq reconnu pour ce CPU** maximum transition latency: 4294.55 ms. In English : no cpufreq pilot found for this CPU. Thus my CPU runs always at full speed (2,2 GHz) which consume the battery and shorten its life. I don't either know how to activate turbo mode. Please help ! Regards, Al

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  • Find all cycles in graph, redux

    - by Shadow
    Hi, I know there are a quite some answers existing on this question. However, I found none of them really bringing it to the point. Some argue that a cycle is (almost) the same as a strongly connected components (s. http://stackoverflow.com/questions/546655/finding-all-cycles-in-graph/549402#549402) , so one could use algorithms designed for that goal. Some argue that finding a cycle can be done via DFS and checking for back-edges (s. boost graph documentation on file dependencies). I now would like to have some suggestions on whether all cycles in a graph can be detected via DFS and checking for back-edges? My opinion is that it indeed could work that way as DFS-VISIT (s. pseudocode of DFS) freshly enters each node that was not yet visited. In that sense, each vertex exhibits a potential start of a cycle. Additionally, as DFS visits each edge once, each edge leading to the starting point of a cycle is also covered. Thus, by using DFS and back-edge checking it should indeed be possible to detect all cycles in a graph. Note that, if cycles with different numbers of participant nodes exist (e.g. triangles, rectangles etc.), additional work has to be done to discriminate the acutal "shape" of each cycle.

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  • Fixing up Configurations in BizTalk Solution Files

    - by Elton Stoneman
    Just a quick one this, but useful for mature BizTalk solutions, where over time the configuration settings can get confused, meaning Debug configurations building in Release mode, or Deployment configurations building in Development mode. That can cause issues in the build which aren't obvious, so it's good to fix up the configurations. It's time-consuming in VS or in a text editor, so this bit of PowerShell may come in useful - just substitute your own solution path in the $path variable: $path = 'C:\x\y\z\x.y.z.Integration.sln' $backupPath = [System.String]::Format('{0}.bak', $path) [System.IO.File]::Copy($path, $backupPath, $True) $sln = [System.IO.File]::ReadAllText($path)   $sln = $sln.Replace('.Debug|.NET.Build.0 = Deployment|.NET', '.Debug|.NET.Build.0 = Development|.NET') $sln = $sln.Replace('.Debug|.NET.Deploy.0 = Deployment|.NET', '.Debug|.NET.Deploy.0 = Development|.NET') $sln = $sln.Replace('.Debug|Any CPU.ActiveCfg = Deployment|.NET', '.Debug|Any CPU.ActiveCfg = Development|.NET') $sln = $sln.Replace('.Deployment|.NET.ActiveCfg = Debug|Any CPU', '.Deployment|.NET.ActiveCfg = Release|Any CPU') $sln = $sln.Replace('.Deployment|Any CPU.ActiveCfg = Debug|Any CPU', '.Deployment|Any CPU.ActiveCfg = Release|Any CPU') $sln = $sln.Replace('.Deployment|Any CPU.Build.0 = Debug|Any CPU', '.Deployment|Any CPU.Build.0 = Release|Any CPU') $sln = $sln.Replace('.Deployment|Mixed Platforms.ActiveCfg = Debug|Any CPU', '.Deployment|Mixed Platforms.ActiveCfg = Release|Any CPU') $sln = $sln.Replace('.Deployment|Mixed Platforms.Build.0 = Debug|Any CPU', '.Deployment|Mixed Platforms.Build.0 = Release|Any CPU') $sln = $sln.Replace('.Deployment|.NET.ActiveCfg = Debug|Any CPU', '.Deployment|.NET.ActiveCfg = Release|Any CPU') $sln = $sln.Replace('.Debug|.NET.ActiveCfg = Deployment|.NET', '.Debug|.NET.ActiveCfg = Development|.NET')   [System.IO.File]::WriteAllText($path, $sln) The script creates a backup of the solution file first, and then fixes up all the configs to use the correct builds. It's a simple search and replace list, so if there are any patterns that need to be added let me know and I'll update the script. A RegEx replace would be neater, but when it comes to hacking solution files, I prefer the conservative approach of knowing exactly what you're changing.

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  • Cpu usage from top command

    - by kairyu
    How can i get the result like example following. Any command or scripts? Snapshot u1234 3971 1.9 0.0 0 0 ? Z 20:00 0:00 [php] u1234 4243 3.8 0.2 64128 43064 ? D 20:00 0:00 /usr/bin/php /home/u1234/public_html/index.php u1234 4289 5.3 0.2 64128 43064 ? R 20:00 0:00 /usr/bin/php /home/u1234/public_html/index.php u1234 4312 9.8 0.2 64348 43124 ? D 20:01 0:00 /usr/bin/php /home/u1234/public_html/index.php u1235 4368 0.0 0.0 30416 6604 ? R 20:01 0:00 /usr/bin/php /home/u1235/public_html/index.php u1236 4350 2.0 0.0 34884 13284 ? D 20:01 0:00 /usr/bin/php /home/u1236/public_html/index.php u1237 4353 13.3 0.1 51296 30496 ? S 20:01 0:00 /usr/bin/php /home/u1237/public_html/index.php u1238 4362 63.0 0.0 0 0 ? Z 20:01 0:00 [php] u1238 4366 0.0 0.1 51352 30532 ? R 20:01 0:00 /usr/bin/php /home/u1238/public_html/index.php u1239 4082 3.0 0.0 0 0 ? Z 20:00 0:01 [php] u1239 4361 26.0 0.1 49104 28408 ? R 20:01 0:00 /usr/bin/php /home/u1239/public_html/index.php u1240 1980 0.4 0.0 0 0 ? Z 19:58 0:00 [php] CPU TIME = 8459.71999999992 This result i got from hostgator support :) I was used "top -c" but they do not show "/home/u1239/public_html/index.php Thanks

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  • Laserjet Experts: How many power cycles per month?

    - by marienbad
    I recently got a nice Laserjet 8100DN for my house. I will probably never print more than 1% of its rated monthly duty cycle. But it runs some fairly noisy fans 24/7 if it's left on, so I am in the habit of turning the machine off as soon as I'm done with it. So, for all you who have a lot of experiencing administrating workgroup LaserJets, do you think I'll end up killing it from too many on-off cycles?

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  • monit syntax error : "if 5 restarts within 5 cycles then alert"

    - by omry
    I am trying to get an alert from monit if it fails to restart a service 5 times, but I get a syntax error /etc/monit/monit.d/engine.conf:5: Error: syntax error 'alert' this is the engine.conf file: check process engine with pidfile /var/run/engine.pid group engine start program = "/etc/init.d/engine start" stop program = "/etc/init.d/engine stop" if 5 restarts within 5 cycles then alert any idea what's wrong with it?

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  • Laserjet Experts: How many power cycles per month?

    - by marienbad
    I recently got a nice Laserjet 8100DN for my house. I will probably never print more than 1% of its rated monthly duty cycle. But it runs some fairly noisy fans 24/7 if it's left on, so I am in the habit of turning the machine off as soon as I'm done with it. So, for all you who have a lot of experiencing administrating workgroup LaserJets, do you think I'll end up killing it from too many on-off cycles?

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  • CPUID on Intel i7 processors

    - by StarPacker
    I'm having an issue with my CPUID-based code on newer i7-based machines. It is detecting the CPU as having a single core with 8 HT units instead of 4 cores each with 2 HT units. I must be misinterpreting the results of the CPUID information coming back from the CPU, but I can't see how. Basically, I iterate through each processor visible to Windows, set thread affinity to that thread and then make a sequence of CPUID calls. args = new CPUID_Args(); args.eax = 1; executeHandler(ref args); if (0 != (args.edx & (0x1 << 28))) { //If the 28th bit in EDX is flagged, this processor supports multiple logical processors per physical package // in this case bits 23:16 of EBX should give the count. //** EBX here is 0x2100800 logicalProcessorCount = (args.ebx & 0x00FF0000) >> 16; //** this tells me there are 16 logical processors (wrong) } else { logicalProcessorCount = 1; } apic = unchecked((byte)((0xFF000000 & args.ebx) >> 24)); if (maximumSupportedCPUID >= 4) { args = new CPUID_Args(); args.eax = 4; executeHandler(ref args); //EAX now contains 0x1C004121 coreCount = 1 + ((args.eax & 0xFC000000) >> 26); //This calculates coreCount as 8 } else { coreCount = 1; } This sequence repeats for the remainder of the CPUs in the system. Has anyone faced this before?

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  • PHP5 getrusage() returning incorrect information?

    - by Andrew
    I'm trying to determine CPU usage of my PHP scripts. I just found this article which details how to find system and user CPU usage time (Section 4). However, when I tried out the examples, I received completely different results. The first example: sleep(3); $data = getrusage(); echo "User time: ". ($data['ru_utime.tv_sec'] + $data['ru_utime.tv_usec'] / 1000000); echo "System time: ". ($data['ru_stime.tv_sec'] + $data['ru_stime.tv_usec'] / 1000000); Results in: User time: 29.53 System time: 2.71 Example 2: for($i=0;$i<10000000;$i++) { } // Same echo statements Results: User time: 16.69 System time: 2.1 Example 3: $start = microtime(true); while(microtime(true) - $start < 3) { } // Same echo statements Results: User time: 34.94 System time: 3.14 Obviously, none of the information is correct except maybe the system time in the third example. So what am I doing wrong? I'd really like to be able to use this information, but it needs to be reliable. I'm using Ubuntu Server 8.04 LTS (32-bit) and this is the output of php -v: PHP 5.2.4-2ubuntu5.10 with Suhosin-Patch 0.9.6.2 (cli) (built: Jan 6 2010 22:01:14) Copyright (c) 1997-2007 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies

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  • C or assembly code to find current cpu core speed

    - by honestann
    How can my application efficiently determine the following information peroidically while it executes: 1: current speed of each of the 8 CPU cores. 2: which core the code is currently executing on. My application is C and assembly-language, so any solution in either C or assembly-language is fine. This code needs to execute quickly, so creating, reading and processing a file generated by "cat /proc/cpuinfo" is much too slow. The cores slow-down and speed-up automatically, probably to keep CPU temperature under control. Therefore, a one-time measure is not sufficient for my purposes. My application already reads and subtracts the cpu cycle counter in assembly language to determine number of clock cycles, but my program cannot compute elapsed time in nanoseconds unless it knows the current clock frequency of the cpu cores (and which core the code is executing on). Thanks!

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  • Terminal error messages: bash: /dev/cgroup/cpu/user/2823/tasks: No such file or directory

    - by sasaenator
    This is what I get when I start up the terminal: bash: /dev/cgroup/cpu/user/2823/tasks: No such file or directory bash: /dev/cgroup/cpu/user/2823/notify_on_release: No such file or directory bash: /dev/cgroup/cpu/user/2823/tasks: No such file or directory bash: /dev/cgroup/cpu/user/2823/notify_on_release: No such file or directory sasa@sasa:~$*** I reinstalled 10.10 yesterday because of other problems, I didn't have this error message before. I have a separate /home partition, and new installation picked up almost all of the old settings, also those which I don't like, but it looks like that is not a problem or maybe I am wrong? Wouldn't ask if I knew! :) I'll be glad to post more info if someone needs it!

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  • Fujitsu LifeBook T4010D Laptop CPU Fan from Pcpartsltd.com

    - by pcpartsltd
    est and 100% work perfectly Fujitsu LifeBook T4010D Laptop CPU Cooling Fan MCF-S4512AM05 Features: * MODEL:MCF-S4512AM05. * Package Content: 1x CPU Cooling Fan * Condition: New * Warranty: 3 Months Warranty Compatible Model: Fujitsu LifeBook T4010D Laptop Pcpartsltd.com limited is a direct Exporter of high quality pc part notebooks, laptop power adapters, laptop batteries, laptop keyboards, laptop Inverters, laptop Hinges, laptop CPU Fan, laptop driver, laptop MotherBoards, Samsung Wall Mount, laptop LCD Bezel/ LCD lid, laptop lcd/led panel and Laptop LCD Video Cable. We are Laptop Parts experts.

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  • Running C++ AMP kernels on the CPU

    - by Daniel Moth
    One of the FAQs we receive is whether C++ AMP can be used to target the CPU. For targeting multi-core we have a technology we released with VS2010 called PPL, which has had enhancements for VS 11 – that is what you should be using! FYI, it also has a Linux implementation via Intel's TBB which conforms to the same interface. When you choose to use C++ AMP, you choose to take advantage of massively parallel hardware, through accelerators like the GPU. Having said that, you can always use the accelerator class to check if you are running on a system where the is no hardware with a DirectX 11 driver, and decide what alternative code path you wish to follow.  In fact, if you do nothing in code, if the runtime does not find DX11 hardware to run your code on, it will choose the WARP accelerator which will run your code on the CPU, taking advantage of multi-core and SSE2 (depending on the CPU capabilities WARP also uses SSE3 and SSE 4.1 – it does not currently use AVX and on such systems you hopefully have a DX 11 GPU anyway). A few things to know about WARP It is our fallback CPU solution, not intended as a primary target of C++ AMP. WARP stands for Windows Advanced Rasterization Platform and you can read old info on this MSDN page on WARP. What is new in Windows 8 Developer Preview is that WARP now supports DirectCompute, which is what C++ AMP builds on. It is not currently clear if we will have a CPU fallback solution for non-Windows 8 platforms when we ship. When you create a WARP accelerator, its is_emulated property returns true. WARP does not currently support double precision.   BTW, when we refer to WARP, we refer to this accelerator described above. If we use lower case "warp", that refers to a bunch of threads that run concurrently in lock step and share the same instruction. In the VS 11 Developer Preview, the size of warp in our Ref emulator is 4 – Ref is another emulator that runs on the CPU, but it is extremely slow not intended for production, just for debugging. Comments about this post by Daniel Moth welcome at the original blog.

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  • pae kernel required for my cpu [closed]

    - by Edward Meyer
    Possible Duplicate: How can I install 12.04 on a non-PAE CPU? (error “Kernel requires features not present on the CPU: PAE”) Virtualbox install 12.04 guest: “pae not present” After loading ubuntu-12.04.1-desktop-i386.iso into my Oracle VM, the hard drive would not boot because the version for my cpu require the pae kernel. How do I insert the pae kernel or download a copy of ubuntu with the pae kernel?

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