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• What does %st mean in top?

  - by Ben

  Here is an example from my top: Cpu(s): 6.0%us, 3.0%sy, 0.0%ni, 78.7%id, 0.0%wa, 0.0%hi, 0.3%si, 12.0%st I am trying to figure out the significance of the %st field. I read that it means steal cpu and it represents time spent by the hypervisor, but I want to know what that actually means to me. Does it mean I may be on a busy physical server and someone else is using too much CPU on the server and they are taking from my VM? If I am using EBS could it be related to handling EBS I/O at the hypervisor level? Is it related to things running on my VM or is it completely unaffected by me?

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• Where does power consumption go in a computer?

  - by Johannes Rössel

  Today we had a weird discussion over lunch: What exactly causes power consumption in a computer, particularly in the CPU? Figures you usually see indicate that only a percentage (albeit a large one) of the power consumption ends up in heat. However, what exactly does happen with the rest? A CPU isn't (anymore) a device that mechanically moves parts, emits light or uses other ways of transforming energy. Conservation of energy dictates that all energy going in has to go out somewhere and for something like a CPU I seriously can't imagine that output being anything but heat. Us being computer science instead of electrical engineering students certainly didn't help in accurately answering the question.

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• Understanding top output in Linux

  - by Rayne

  Hi, I'm trying to determine the CPU usage of a program by looking at the output from Top in Linux. I understand that %us means userspace and %sy means system/kernel etc. But say I see 100%us. Does this mean that the CPU is really only doing useful work? What if a CPU is tied up waiting for resources that are not avaliable, or cache misses, would it also show up in the %us column, or any other column? Thank you.

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• PC wont boot with more than 1 stick of RAM.

  - by Aidan

  Hi Guys, I've got the following computer and I've just put in a new CPU QX9650 and I've run into this problem since making this hardware change. Whenever I put more than 1 of my 4 sticks of ram into my machine it wont load an OS. It'll go through the BIOS but BSOD on windows load. It also wont let me install an OS from disk or boot into Linux. I've ran memtest with all 4 sticks in and I get 10k+ errors on test5. Each stick of ram on it's own is fine and functions properly. I only have problems when all 4 sticks are in the machine at the same time. System specs.. CPU: QX9650 Mobo: Asus P5B 2104 BIOS RAM: 2xPC25400 DDR2 , 2xPC2 6400 both OCZ. Is the problem on my end or is the CPU faulty?

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• PC wont boot with more than 1 stick of RAM.

  - by Aidan

  Hi Guys, I've got the following computer and I've just put in a new CPU QX9650 and I've run into this problem since making this hardware change. Whenever I put more than 1 of my 4 sticks of ram into my machine it wont load an OS. It'll go through the BIOS but BSOD on windows load. It also wont let me install an OS from disk or boot into Linux. I've ran memtest with all 4 sticks in and I get 10k+ errors on test5. Each stick of ram on it's own is fine and functions properly. I only have problems when all 4 sticks are in the machine at the same time. System specs.. CPU: QX9650 Mobo: Asus P5B 2104 BIOS RAM: 2xPC25400 DDR2 , 2xPC2 6400 both OCZ. Is the problem on my end or is the CPU faulty?

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• Intel T5600 to upgrade T5250

  - by galets

  I want to upgrade my laptop which has T5250 CPU with a T5600 CPU to support virtualization. I ordered T5600 on ebay, but it didn't fit. It says T5250 supports PPGA478 socket, so I assume that is what I have. T5600 says supports "PBGA479, PPGA478". Since T5600 didn't fit as a replacement, I assume it means there are 2 models of T5600, one supports PBGA479, another one supports PPGA478, and not like I thought - one CPU supports both. Is that a correct statement? Does anybody know if it's even possible to do such an upgrade, or I'm wasting time?

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• performance monitoring

  - by Sunny

  I want to monitor CPU usage, disk read/write usage for a particular process, say ./myprocess. To monitor CPU top command seems to be a nice option and for read and write iotop seems to be a handy one. For example to monitor read/write for every second i use the command iotop -tbod1 | grep "myprocess". My difficulty is I just want only three variables to store, namely read/sec, write/sec, cpu usage/sec. Could you help me with a script that combines the outputs the above said three variables from top and iotop to be stored into a log file? Thanks!

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• Assembling a number-crunching computer [closed]

  - by tugrul büyükisik

  What is needed to make a GPU fully fed by CPU? Comparing their flops/s is enough? For example, if i could manage to make a very old(pentium-3) CPU with one of Nvidia-Fermi GPU, it would not be able to fed the gpu with data per sec. What is the criteria to fit CPU to GPU exactly when OpenCL or some similar work needed? Of course RAM and BUS will be chosen in a similar way but how exactly? Assume each GPU-core will calculate a sqrt and a division and an adding for 100 times for every itearation. Thanks.

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• xen virtual machines get to many porcentages of cpus

  - by ki0

  Hi everyone, This is my question. I have one Xen server with 8 CPU's and 6 virtual machine running, each virtual hard disk are running in diferent physical hardisk. Everything worked fine but sometimes one virtual machine get almost whole CPU, if the Domain-0 is 90% that is normal, the virtual machine is 500% usage of CPU. I have improved that it is not depends who are working with the VM even when nobody are working with the server this still happens. I dont know what happen. Anyone have any idea?¿ or anyone have happened the same?¿

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• AWStats on Plesk consumes all of CPU and crashes server - how do you disable plesk

  - by columbo

  I have Plesk 9.0.1 running on a Red Hat server. Every week or so at about 4:10 AM the server locks up. At this time the server CPU usage shoots from 4% to 90% at the same time as a mass of awstats.pl processes start (I can't see how many as my datat only shows the top 30 processes, but all of these are awstats.pl). I turned off awstats through the Plesk control panel for all but 5 domains but I still get 90% CPU usage and at least 30 instances of awstats.pl happening at 4:10am as usual. Does anyone know why this may be? Does anyone know how to disable awstats (I have stats covered using piwik)? Or how do I uninstall awstats without snarling up Plesk?

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• IIS, multiple CPU cores, application pools and worker processes - best configuration for a single si

  - by Egghead Design

  Hi We use Kentico CMS and I've exchanged emails with them about a web garden deployment. We have a single site running on a server with 8 cpu cores. In line with Kentico's advice, we have not altered the application pool web garden setting from the default i.e. it is set to a maximum number of worker processes of 1. Our experience is that the site only uses one of the cpu cores - the others are idling. When I emailed them about this, their response was that the OS/IIS would handle this and use other cores as necessary even though the application pool only has a single worker process. Now, I've a lot of respect for the guys at Kentico, but this doesn't seem right to me? Surely, if we want to use all cores, we need to permit eight worker processes (and implement session state storage in SQL server)? Many thanks Tony

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• php-cgi cpu usage is super high

  - by Ryan Thompson

  I am getting constantly high and wildly fluctuating CPU usage % for php-cgi commands as seen via "top" on my Centos server.. I have a server density account and it seems that this is a common trend: User - PID - CPU % - MEM % - VSZ - RSS - TT - Stat - Started - Time - Command 500 - 6389 - 22.4 - 3 - 271136 - 32380 - ? - S - 20:26 - 0:40 - /usr/bin/php-cgi Seems there are about 6 or so of those records in my processes list at any given check-in. Any ideas what's causing this? I have fast_cgi installed and the module is loading.. Not sure why it isn't handling this though. Any help would be greatly appreciated! Ryan

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• Postgres 9.0 locking up, 100% CPU

  - by Jake

  We are having a problem where our Postgres 9.0 server occasionally locks up and kills our webapp. Restarting Postgres fixes the problem. Here's what I've been able to observe: First, usage of one CPU jumps to 100% for a few minutes Disk operations drop to ~0 during this time Database operations drop to 0 (blocks and tuples per sec) Logs show during this time: WARNING: worker took too long to start; cancelled WARNING: worker took too long to start; cancelled No Queries in logs (only those over 200ms are logged) No unusually long-running queries logged before or during Then the second CPU jumps to 100% The number of postgres processes jumps from the usual 8-10 to ~20 Matched by a spike in Postgres Blocks per second (about twice normal) Logs show LOG: could not accept SSL connection: EOF detected Queries are running but slow Restarting postgres returns everything to normal Setup: Server: Amazon EC2 Large Ubuntu 10.04.2 LTS Postgres 9.0.3 Dedicated DB server Does anyone have any idea what's causing this? Or any suggestions about what else I should be checking out?

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• Windows / Apache / PHP CPU at 100% under small load

  - by Bart

  I have a Windows box loaded with Apache 2.2 and PHP 5.2. It runs great if only a few users are on it at a time, but under load testing (50 users for test #1), the CPU climbs up to 100%. Nearly all of this CPU usage comes from httpd.exe. I currently have PHP set up via php5_module, but one of the first things I plan to try next is to use FastCGI instead. Is FastCGI better at handling multiple connections? Any other ideas on what might be causing Apache to run so high?

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• Slowing down cpu speed

  - by New linux user

  How to slow down my laptop cpu so that it does not overheat?

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• CPU I/O communication

  - by b-gen-jack-o-neill

  Hi, I know there is this question already discussed, but I still don´t understand something, so please just help me clarify it. What I understand there is 2 way to do I/O aka communicate from CPU with other HW. One is to use in and out instructions, and second is the memory mapped. But what I don´t actually understand is, is IN and OUT instructions are used, you define source port. But what is this port? I mean, is it different set of pins on CPU or what? And, to what is that port connected? And for the memory mapped, I miss just a tiny detail. Wheather memory mapped I/O must be first set by IN and OUT instructions, or does the device actually somehow itself connects to the RAM and reads it? Thanks.

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• Finding throuput of CPU and Hardrive on Solaris

  - by Jim

  How do i find the throughput of a CPU and the Hardisk on an open solaris machine. Using MPstat or iostat. I'm having a hard time identifying the throughput if it is given at all in the commands output. Eg. in mpstat there is very little explanation as to what the columns mean http://docs.sun.com/app/docs/doc/816-5166/mpstat-1m?l=en&a=view&q=syscl+mpstat I've been using the syscl column divided by time interval to find the throughput but to be honest i have no idea what a system call truelly is. I'm trying to to analyze a hardrive and CPU while writing a file to the hardisk and when at rest Thanks in advance. Jim

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• sar command to generate only CPU utilization and network statistics in Linux

  - by Vijay Shankar Kalyanaraman

  I want to be able to generate the system activity report every 30 seconds or every minute and store in a file and use it for diagnostic purposes on my VM. So I give an output file for the sar command and read it using the "-f" option. But I only use the CPU utilization and network utilization part of the report and so rest is all that I don't want to save (waste the space in the disk to store these reports). Also the sar files that are generated are all binary. Is there a way to collect these stats for the CPU and network utilization alone? and so save almost 2/3rds the space on the disk?

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• Work around for yahoo mail slowness (using 100% cpu)

  - by Tony Lee

  My yahoo mail is very slow sometimes. When it is, I notice that IE8 is using 100% cpu. Using sysinternals process explorer I discovered the thread using all the cpu in IE8 has Flash in the stackwalk. I upgraded flash from 9 to 10, but the problem persists. I'm about to edit hosts to block the flash content by redirecting the yahoo and ad click dns entries. Is there some easier way to get flash to behave? The fix for the long run will be switching to gmail.

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• Thermal risks to other components when watercooling CPU

  - by B Sharp

  I recently ordered all the components for a new desktop system to replace my old, dying computer. I wanted to have a really quiet desktop, so I got a case rated for being quiet and opted to try a closed-system CPU water cooling kit (Antec Kuhler H2O 620) that was on sale for a very good price over the Thanksgiving weekend. Most of my components are still in transit, but I became somewhat worried when a friend mentioned that abandoning air cooling units can result in heat buildup inside the case due to heat generated by the video card and other components such as RAM, the northbridge, MOSFETs and voltage regulators radiating heat that the CPU fan would normally at least keep circulating around so it doesn't build up in localized areas. Is this a realistic problem? What other precautions should I take to remove heat from other components? Adding more case fans seems like it would get really noisy. Are there quiet alternatives?

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• SQL Server 2005 running at 97% CPU usage

  - by Shiraz Bhaiji

  How can I findout which statements are using the CPU?

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• How to properly set CPU Units for OpenVz VEs

  - by gucki

  According to all the sources I read (openvz wiki, various mailinglists, forums, ..) the values of the cpuunits settings are relative to each other. So when all are equal and the system is busy, all receive the same cpu share. But something still puzzles me with that: why is there a tool "vzcpucheck" which shows "the power of the node/ host": Current CPU utilization: 18000 Power of the node: 880001 Why is there (do I need) an absolute number when all settings are only relative? Shouldn't those two settings result in exactly the same? ve1: 1 ve2: 1 ve3: 1 = 3 ve1: 293334 ve1: 293334 ve1: 293334 = 880001 (power of the node) What's the difference?

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• Finding throuput of CPU and Hardrive on Solaris

  - by Jim

  How do I find the throughput of a CPU and the hard disk on an OpenSolaris machine? Using mpstat or iostat? I'm having a hard time identifying the throughput if it is given at all in the commands output. For example, in mpstat there is very little explanation as to what the columns mean. I've been using the syscl column divided by time interval to find the throughput but to be honest I have no idea what a system call truly is. I'm trying to to analyze a hardrive and CPU while writing a file to the hardisk and when at rest.

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• Windows 7 system CPU bogged by windows services, no explanation

  - by Alex

  I'm looking at a laptop for a colleague which is running terribly slow. A quick look showed that the CPU was 100% used by 2-3 SVCHost processes, which off course doesn't tell much since those are just 'cover' processes with services running underneath them. So I fired up process explorer in hopes of finding a shady rogue service which was bogging the system, but to my suprise I found genuine MS Windows processes (or at least damn-good disguised ones) are bogging down the system: dnscache (DNS Client) IKEEXT (IKE and AuthIP IPSec Keyring modules) iphlpsvc (IP Helper) Seen separately, these processes might seem odd to be using a lot of CPU, but taking a step back one can conclude that all three services are quite closely related to networking. I've tried running: netsh int ip reset log.txt which has helped me save bizarre network-related problems in the past, but this didn't help Off course I though about a virus, but both MS Security Essentials as well as malwarebytes (let both run a full scan).

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• process ksoftirqd consumes permanent 15% CPU load [closed]

  - by markus

  Possible Duplicate: Anyone else experiencing high rates of Linux server crashes during a leap second day? The process ksoftirqd/0 uses permanent 15% CPU on our debian squeeze server. 4 root 20 0 0 0 0 R 15.0 0.0 850:59.17 ksoftirqd/0 I already read that this can have various reason like Full harddisk or high network traffic. In our case we do have more or less low network traffic and enough space on hard disk. How can I analyse what causes ksoftirqd/0 to use permanently 15% CPU?

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