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  • Any way to disable specific CPU idle (Cx) states?

    - by Philippe
    I just got a new Toshiba Tecra S11 notebook, which has a Core i5 520M CPU, and it appears to suffer from a well-known problem: a high pitched noise when the CPU is idle. Googling around revealed that this is caused by a specific power-saving mode in the CPU. In most cases, C4 mode is blamed for the noise. So my question is: is it possible to disable C4 mode (or any other "sleep" mode) using some utility or BIOS setting? I don't mind if it hurts battery life. I'd appreciate any advice on this matter. It's driving me crazy. FYI: I'm running Windows 7 64-bit

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  • Solaris ????????????????

    - by Homma
    ???? ???????????? CPU ?????????????????????????????????? OS ??????????????????????????????????????????????CPU ??????????????????? CPU ???????????????????????????????????????????????????????????????????????????? CPU ??????????????????????????????????? CPU ???????????????????????? CPU ????????????????????????? CPU ?????????????????????????????????????????????????????????????????????????????DTrace ????????????????? ?? ????????????????????????????????????????????? CPU ????????????????? # cat prog01.c int main() { while(1) {}; } # gcc prog01.c -o prog01 ?????????????????????pbind ?????????? CPU 1 ??????psradm ????????? CPU 1 ?????????????????????????? CPU 1 ?????????????? # ./prog01 & [1] 3247 # pbind -b 1 3247 process id 3247: was not bound, now 1 # psradm -i 1 # psrinfo 1 1 no-intr since 09/24/2012 05:46:25 ????????? Solaris 10 8/11 ????????? # cat /etc/release Oracle Solaris 10 8/11 s10x_u10wos_17b X86 Copyright (c) 1983, 2011, Oracle and/or its affiliates. All rights reserved. Assembled 23 August 2011 ????????????????????????? DTrace ??????????????(??????)???????????????????????????? preempt ??????????????????? DTrace ????????????????????????????????????????????????????????????????????????????? # dtrace -qn 'BEGIN{ ts = timestamp; } sched:::preempt/pid == $target/ { printf("%d\n",timestamp - ts); ts = timestamp }' -p 3247 ?????????????????????? 200 ????????????????????? # dtrace -qn 'BEGIN{ ts = timestamp; } sched:::preempt/pid == $target/ { printf("%d\n",timestamp - ts); ts = timestamp }' -p 3247 3547836 199976558 200030610 199964001 200001048 199999666 200021432 ???????????? 200 ????? CPU ????????????? CPU ????????????????????? ??????? CPU 1 ????????????? prog01 ?????????????????????????????????? prog01 ?????????????????????????????????????????????????????????? 200 ??????????????? ????????????????????????? ?????????????????????????????? DTrace ????????DTrace ???????????????????????????????????????????????????????????????????? # dtrace -qn 'sched:::preempt/pid == $target/ { printf("%d\n", ((tsproc_t*)curthread->t_cldata)->ts_timeleft); }' -p 3247 ??????????????????????????????? 1/100 ???????? 200 ????????????????? # dtrace -qn 'sched:::preempt/pid == $target/ { printf("%d\n", ((tsproc_t*)curthread->t_cldata)->ts_timeleft); }' -p 3247 20 20 20 20 20 20 ????????? 200 ???????????????????? ???????? 200 ??????????????????????????????????????????????????????????????????????????????? DTrace ???????DTrace ??????????????? # dtrace -qn 'sched:::preempt/pid == $target/ { printf("%d\n", ((tsproc_t*)curthread->t_cldata)->ts_cpupri); }' -p 3247 ???????????????????????????? # dtrace -qn 'sched:::preempt/pid == $target/ { printf("%d\n", ((tsproc_t*)curthread->t_cldata)->ts_cpupri); }' -p 3247 0 0 0 0 0 0 ????????????????? 0 ???????? 0 ?????????????????????? dispadmin ???????????????? # dispadmin -c TS -g | head # Time Sharing Dispatcher Configuration RES=1000 # ts_quantum ts_tqexp ts_slpret ts_maxwait ts_lwait PRIORITY LEVEL 200 0 50 0 50 # 0 200 0 50 0 50 # 1 200 0 50 0 50 # 2 200 0 50 0 50 # 3 200 0 50 0 50 # 4 200 0 50 0 50 # 5 ???????PRIORITY LEVEL 0 ???????? ts_quantum ? 200 ??????????? 0 ???? 200 ???????????????????????????(RES ??? 1000 ????ts_quantum ???? 1/1000 ?)? ????????? ????????????????????? mpstat ????????????????????????????icsw ??? 5 ???????????200 ?????????????????????????????????????????????????????? CPU ??? 200 ????????????? # mpstat 1 | egrep '^ 1|csw' CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 347 196 1 42 1 3 0 0 2 9 1 0 90 CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 0 16 0 0 5 0 0 0 0 100 0 0 0 CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 0 7 0 0 5 0 0 0 0 100 0 0 0 CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 0 8 0 0 5 0 0 0 0 100 0 0 0 CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 0 18 1 0 5 0 0 0 0 100 0 0 0 ???????????? Solaris ????????????????????????????????????????????? priocntl ???????????????? 1 ?????????? # priocntl -s -c FX -t 1000 -i pid `pgrep prog01` ??????? mpstat ?????????CPU ??????? 1 ?????????????????????????????????????????????????????????????????????????????????????????????????????????????? # mpstat 1 | egrep '^ 1|csw' CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 346 196 1 42 1 3 0 0 2 9 1 0 90 CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 0 2 0 0 1 0 0 0 0 100 0 0 0 CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 0 2 0 0 1 0 0 0 0 100 0 0 0 CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 0 13 0 0 2 0 0 0 0 100 0 0 0 CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 0 2 0 0 1 0 0 0 0 100 0 0 0 CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 1 0 0 0 5 1 0 1 0 0 0 0 100 0 0 0 ????DTrace ????????????????????????????? # dtrace -qn 'sched:::preempt/pid == $target/ { printf("%d\n", ((fxproc_t*)curthread->t_cldata)->fx_timeleft); }' -p `pgrep prog01` 100 100 100 100 100 100 ??? Solaris ???????????????????????????????????????????????????????????????? 200 ???????????????????????????????????????????????? ??????????????????????????????????????????????????????????????? CPU ?????????I/O ?????????????????????????????????????????????????????????? ?????????????????????????? http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/disp/ ????????? ???????????????????

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  • AMD FX8350 CPU - CoolerMaster Silencio 650 Case - New Water Cooling System

    - by fat_mike
    Lately after a use of 6 months of my AMD FX8350 CPU I'm experiencing high temperatures and loud noise coming from the CPU fan(I set that in order to keep it cooler). I decided to replace the stock fan with a water cooling system in order to keep my CPU quite and cool and add one or two more case fans too. Here is my case's airflow diagram: http://www.coolermaster.com/microsite/silencio_650/Airflow.html My configuration now is: 2x120mm intake front(stock with case) 1x120mm exhaust rear(stock with case) 1 CPU stock I'm planning to buy Corsair Hydro Series H100i(www.corsair.com/en-us/hydro-series-h100i-extreme-performance-liquid-cpu-cooler) and place the radiator in the front of my case(intake) and add an 120mm bottom intake and/or an 140mm top exhaust fan. My CPU lies near the top of the MO. Is it a good practice to have a water-cooling system that takes air in? As you can see here the front of the case is made of aluminum. Can the fresh air go in? Does it even fit? If not, is it wiser to get Corsair Hydro Series H80i (www.corsair.com/en-us/hydro-series-h80i-high-performance-liquid-cpu-cooler) and place the radiator on top of my case(exhaust) and keep the front 2x120mm stock and add one more as intake on bottom. If you have any other idea let me know. Thank you. EDIT: The CPU fan running ~3000rpm and temp is around 40~43C on idle and save energy. When temp is going over 55C when running multiple programs and servers on localhost(tomcat, wamp) rpm is around 5500 and loud! I'm running Win8.1 CPU not overclocked PS: Due to my reputation i couldn't post the links that was necessary. I will edit ASAP.

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  • How are interrupts handled by dual processor machines?

    - by jeffD
    I have an idea of how interrupts are handled by a dual core CPU. I was wondering about how interrupt handling is implemented on a board with more than one physical processor. Is any of the interrupt responsibility determined by the physical board's configuration? Each processor must be able to handle some types of interrupts, like disk I/O. Unless there is some circuitry to manage and dispatch interrupts to the appropriate processor? My guess is that the scheme must be processor neutral, so that any processor and core can run the interrupt handler. If a core is waiting on a disk read, will that core be the one to run the interrupt handler when the disk is ready?

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  • Redhat cpanel how to limit cpu for a perticular user.

    - by Ahmed M Fituri
    Hello, I have a web server with multiple users in it. one of these users uses mambo, and the cpu usage of this user is more than 90% which leads to a very slow performance of the machine, I have installed cpulimit version 1.1. but there is no particular command that limits the cpu per user. I need to limit this user for at least 50% . please help me ASAP. Thank you.

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  • Huge host CPU usage in idle vmware guest. Ubuntu 10.04 host, Vista SP2 guest

    - by themesandmodules
    I'm experiencing huge host CPU usage with an idle vmware guest. Host: Ubuntu 10.04 32-bit 2.6.32-24-generic-pae. (Very new install, i.e 24 hours ago) Hardware is Dell XPS M1530 laptop, 4GB ram. Intel Core II Duo T9300 2.50Ghz The virtualization setting "VT" or something is enabled in my bios. Guest: Completely fresh install of Windows Vista, upgraded to latest SP2 and all windows updates installed. 1024 - 1512MB ram allocated. Absolutely no other software installed on it, apart from VMWare tools. Situation When the guest is doing absolutely nothing, I watch with sysinternals process watch on the guest. This shows that system idle process is between 70 and 99%, usually around 95%. No actual process doing anything. On the host, I watch with top, I get cpu usage of 20% - 80%, usually around 30%. What I have tried Single and Dual processor available to guest - no change. Turn off all peripherals to guest - no network, drives, usb etc - no change. Turn off 3d acceleration for guest - perhaps a small improvement, or no change. Upping allocated ram to guest from 1024MB to 1512MB - no change. Yelling at vmware - no change. I have experienced a similar issue in the past, which was solved by setting the guest to have 1 CPU. This time that hasn't worked.

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  • Root cause for high CPU usage; which measurement to trust more: Windows Task Manager or Process Explorer?

    - by p.campbell
    Consider this Windows 8.1 machine (in-place upgrade from Windows 8) with differing reports on its CPU usage. The machine is idle, and has been for 3 days. There are no CPU intensive tasks running currently nor over the 3 day idle period. Windows Task Manager is reporting CPU usage constantly at an incredibly high value (and increasing over time!) at around 75%. Process Explorer from SysInternals reports that the CPU usage is much different at around 42% How does Process Explorer report 42.14% usage, but its columns report Idle at 57%, with the sum of the other processes not even approaching 10%? Which of these two values should I trust more, and why should it be trusted over the other measurement? How can I actually determine which process is causing Task Manager to report its values? These Proc Exp metrics were taken with Administrator privileges, and with option 'Show Details for All Processes' Click for larger view:

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  • SQL SERVER – Demo Script – Keeping CPU Busy

    - by pinaldave
    Recently face very interesting situation, during presentations at event, I was asked very famous questions: “My CPU is very high all the time, how can I reduce it?” This is very interesting question and there are many answers and a single blog post is not good enough to justify this subject. I presented few situation to the person who asked the question. The member of the audience who asked question came to me afterwords and asked me few detailed questions. To answer him, I quickly wrote query which simulate high CPU. Here is the script which I wrote which increased CPU from 10% to 80%. I was wondering if there is any similar script which can simulate high CPU usage. If you have share with me and I will publish with due credit. Here is my script for the same: USE AdventureWorks GO DECLARE @Flag INT SET @Flag = 1 WHILE(@Flag < 1000) BEGIN ALTER INDEX [PK_SalesOrderDetail_SalesOrderID_SalesOrderDetailID] ON [Sales].[SalesOrderDetail] REBUILD SET @Flag = @Flag + 1 END GO   Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Which opcodes are faster at the CPU level?

    - by Geotarget
    In every programming language there are sets of opcodes that are recommended over others. I've tried to list them here, in order of speed. Bitwise Integer Addition / Subtraction Integer Multiplication / Division Comparison Control flow Float Addition / Subtraction Float Multiplication / Division Where you need high-performance code, C++ can be hand optimized in assembly, to use SIMD instructions or more efficient control flow, data types, etc. So I'm trying to understand if the data type (int32 / float32 / float64) or the operation used (*, +, &) affects performance at the CPU level. Is a single multiply slower on the CPU than an addition? In MCU theory you learn that speed of opcodes is determined by the number of CPU cycles it takes to execute. So does it mean that multiply takes 4 cycles and add takes 2? Exactly what are the speed characteristics of the basic math and control flow opcodes? If two opcodes take the same number of cycles to execute, then both can be used interchangeably without any performance gain / loss? Any other technical details you can share regarding x86 CPU performance is appreciated

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  • Lighter in CPU/Memory Usage: Lubuntu or Xubuntu

    - by Luis Alvarado
    I am looking for an Ubuntu version that consumes less Memory and CPU. I have read both Lubuntu and Xubuntu (The homepages, wikipedia, phoronix and other sites comparing both). But from experience, which one uses less memory and is less CPU intensive. I need to install them in very old hardware and want to persuade the owner of the hardware of the benefits of Ubuntu. in this case I want to install 11.10 or 12.04 when it comes out. How are each behaving in those versions? The 2 PCs I will be installing either Xubuntu or Lubuntu are: Granpa PC: CPU - Pentium 2 450Mhz RAM - 64MB DIMM Video - 16MB Used for - Documents and Internet. No listening to music, no looking at videos. Just using it for document writing. The other old meat: CPU - Pentium 3 550Mhz RAM - 128MB DIMM Video - 16MB Used for - Documents and Internet also but they want.. or maybe they are wishing for it to use it to see movies and listen to music. This one has internet. The other one does not.

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  • ubuntu 14.04 - only performance and powersave governor available (i5 4.gen)

    - by kinske
    After updating my ubuntu 13.10 to 14.04 there only these to govenors available for my cpu, instead of additionally ondemand and conservative. cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors performance powersave My cpu is a Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz, my laptop a LENOVO B5400 80B6QB0 and my kernel version is 3.14.1-031401-generic x86_64 Before updating the four governors were available. If this is important, I have installed tlp and indicator-cpufreq. How do I get back the missing two govenors? ondemand is really important to me because of power saving.

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  • Ubuntu 12.10 Laptop temperature

    - by romi
    I'm using a laptop having dedicated graphics card with Ubuntu and Windows 7 dual boot. The windows 7 idle temperature for cpu is 51C average and gpu is 46-48.5C, and when in load Cpu temp varies between 55-61C, and GPU 49-51 MAX. But in ubuntu idle temp CPU: 54c Gpu(ati radeon,proprietary driver installed): 50C and on load cpu: 58-69C gpu:53C max. Is it normal? If not is there any solution? Note that i'm using jupiter,latest graphics driver, grub tweaks etc.

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  • php-fpm: very high server load

    - by Derp Derpington
    Since today my webserver (nginx + php-fpm + mysql on a VPS) is very slow. htop says: 1 [|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%] Tasks: 63 total, 13 running 2 [|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%] Load average: 11.67 10.95 6.95 3 [|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%] Uptime: 00:18:40 4 [|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%] 5 [|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%] 6 [|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%] Mem[||||||||||| 137/1280MB] Swp[ 0/0MB] PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command 6802 www 20 0 76232 12320 5716 R 27.0 0.9 0:06.48 php-fpm: pool www 7048 www 20 0 75200 12136 5700 R 52.0 0.9 0:03.64 php-fpm: pool www 6699 www 20 0 74176 11124 5700 R 27.0 0.8 0:07.36 php-fpm: pool www 7029 www 20 0 73668 10380 5676 R 42.0 0.8 0:03.52 php-fpm: pool www 6995 www 20 0 76228 12456 5644 R 42.0 1.0 0:03.98 php-fpm: pool www 6858 www 20 0 74172 10684 5620 R 35.0 0.8 0:05.52 php-fpm: pool www 6998 www 20 0 75200 12072 5620 R 37.0 0.9 0:03.95 php-fpm: pool www 7098 www 20 0 75200 12052 5616 R 42.0 0.9 0:02.33 php-fpm: pool www 7093 www 20 0 76228 12496 5612 R 37.0 1.0 0:03.02 php-fpm: pool www 7226 www 20 0 74692 11080 5588 R 32.0 0.8 0:00.66 php-fpm: pool www CPU: (cat /proc/cpuinfo | grep model) model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz model : 44 model name : Intel(R) Xeon(R) CPU E5620 @ 2.40GHz I think a load of 10 and 100% cpu usage is not normal... How can i fix that?

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  • Tip 14 : Solve SmtpClient issues of delayed email and high CPU usage

    - by StanleyGu
    1. It is quite straightforward using SmtpClient class to send out an email 2. However, when you step through the above code executing smtpClient.Send(), you will notice about 2 minutes delay in receiving the email. 3. My first try to solve the issue of delayed email is to set MaxIdleTime=1 4. The first try solves the issue of delayed email very well but introduces another issue: high CPU usage. The CPU usage of my deployed windows service is consistently at 50%, which is much higher than the expected near-zero CPU usage. 5. The second try is to set MaxIdleTime=2, which solves the both issues.    

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  • How To Force Windows Applications to Use a Specific CPU

    - by Taylor Gibb
    Channing a process’s affinity means that you limit the application to only run on certain logical processors, which can come in terribly handy if you have an application that is hogging all the CPU. Here’s how to choose the processor for a running application. We’ve previously written about how to create a shortcut that forces an application to use a specific CPU, but this is a way to change it on the fly. Note: For the most part we do not recommend you changing these settings, and to rather let Windows manage them. How To Switch Webmail Providers Without Losing All Your Email How To Force Windows Applications to Use a Specific CPU HTG Explains: Is UPnP a Security Risk?

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  • Bluetooth mouse lag on high cpu load ubuntu 11.04 12.10

    - by sirkubax
    I have just migrate to Ubuntu 12.10 and I have noticed that I have huge problem with my bluetooth mouse left click button on a high load (wired, but scroll and right button are not affected) (I think powersave cpu mode affect that more than cpu load) It just not "trigger the interrupt". Mouse is laggy, click are not reggisterd. I can not work like that. At the same time, my touchpad and usb mouse works great. How to check that - limit cpu frequency (I use powersave and ondemend mode) I now wonder, what should I log, check, measure, to capture enough data to fill bug report. Any suggestions? greetings sirkubax

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  • How do I disable/modify CPU underclocking due to temperature on a laptop with a 2nd generation core cpu?

    - by Tyson Marchuk
    I am running Ubuntu 11.04 on a tablet with a Core i5-2557M processor. When doing processing intensive tasks the CPU is forcibly under-clocked to 800MHz (instead of the normal base of 1.7GHz.) The CPU temperature is around 75 C. I have disabled CPU scaling (set governor to performance) but this seems to have no effect. I would like to either modify the behavior so that the throttling happens at 95 C or I would like to disable it altogether. Changing the min/max frequency as root using cpufreq works until the temperature rises and then it ceases to work, ignoring a minimum frequency above the 800MHz. On Windows 7 there is a 3rd party utility that can do this (ThrottleStop). Thank you.

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  • Find out which SQL Server instance is consuming most of the CPU

    We have a number of SQL Server hosts with multiple SQL Server instances. From time to time we have CPU issues, but we are not sure which instance is causing the issue. How do you find which SQL Server instance is causing CPU pressure on machine with multiple SQL Server instances? Check out this tip for ideas on how to find the correct SQL Server instance which is causing CPU pressure. Keep your database and application development in syncSQL Connect is a Visual Studio add-in that brings your databases into your solution. It then makes it easy to keep your database in sync, and commit to your existing source control system. Find out more.

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  • Ubuntu slows down even after cpu-intensive process is ended

    - by Matt2
    After a Skype video call, or the use of virtualbox, Ubuntu slows down to a crawl, even after the process is ended. Running htop reveals that processes that used little CPU before are now all using about 30% cpu (namely Compiz, Firefox, Python, and Skype, but I'm sure there are others), to the point where all my cores are at 99%. All I can do from here is restart. Any idea why this is happpening? I'm running Ubuntu 12.04 64-bit on 3.7 GiB of memory, Intel® Core™ i3 CPU M 330 @ 2.13GHz × 4, VESA: M92 graphics driver. Not sure why I'm running VESA, I installed fglrx, but I suppose that's a different question. Thanks in advance!

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  • Which CPU for SQL Server machine (Xeon, i5, i7, AMD Phenom)?

    - by Tony_Henrich
    I am going to build a full height server machine to be used for SQL Server 2008 64bit. I have $400 to spend for a CPU. Which CPU should I get among i5, i7, Xeon and Phenom in terms of performance. There are so many options and I am out of touch with the latest stuff. All I know I want something fast and works with DDR3 fast memory and works with some kind of fast system bus. I don't care about overclocking, 3D & gfx benchmarks. The machine is not used for games and gfx apps. Any recommendations?

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