CPU is the portion of a computer system that carries out the instructions of a computer program, to perform the basic arithmetical, logical, and input/output operations of the system. The CPU plays a role somewhat analogous to the brain in the computer.

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Events/1 and Server Interrupts

Currently I am seeing a lot of CPU usage on events/1 and I was wanting to know how to figure out what is causing that? cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 ...
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513 views

IIS 6 - CPU throttling on application pools

So after a recent DDoS attack on one our sites that took down all sites on that server Ive started looking into ways to stop this being such an impact on all sites. If the site under DDoS goes down, ...
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670 views

CONFIG_HOTPLUG_CPU=n - kernel panic?

I have a task to disable CPU hotplug in RHEL5 kernel (2.6.18-el5.xxx). I have no problem recompiling an own kernel from the sources with an old config. But as soon as I disable CPU hotplug, I get ...
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125 views

Total CPU usage Object ID?

How can i find the correct OID to get the total cpu usage of my Checkpoint (linux) based firewall? with 8 cores CPU. I found this : ssCpuUser .1.3.6.1.4.1.2021.11.9 ssCpuSystem ...
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75 views

Cloning a server across architectures

I have this Linux (Debian) server that I want to duplicate, with all its services and their settings. Actually, it is to replace the existing server with newer hardware. I'd like the process to be as ...
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65 views

SNMP tick counter wrap around logic

I'm trying to calculate CPU usage in percent over SNMP of a remote agent based on the ssCpuRaw* tick counters. As I understand it they are all of type COUNTER(32 bit) so tey'll wrap around to zero ...
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130 views

Ksoftirqd high load

Recently I notice that one ksoftirqd is always in top of my processlist and takes 90% - 100% cpu. PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND ...
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109 views

pbs check how much cpu a job is using / job % cpu usage

On a cluster a job is submitted to run on N CPUs. qstat -f doesn't show how much CPU resources the job is using other than the time. How does one check whether 100% of each CPU power is used? It is ...
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73 views

High CPU usage when sending email, site freezes

I just moved to a new dedicated server and I'm running into the following issue. I need to email 8000 of my users using the basic PHP mail function - nothing fancy, it's HTML-formatted but it's just ...
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58 views

SSL request freezing openldap

I had two OpenLDAP (a master and a consumer). The master is on Red Hat 6 and consumer was on Red Hat 5. Everything worked well until I upgrade the consumer in Red Hat 6. The sync between the two works ...
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31 views

MySQL Process Big

Ok, so I don't know if this is a repeat question so I'm sorry if it is (I couldn't find anything like it after searching =/) My server seems to be running what seems to me a larger than normal mysql ...
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185 views

Understanding CPU Throttle

kernel /vmlinuz-2.6.32-379.22.1.lve1.2.17.el6.x86_64 ro root=UUID=7cb0b445-0f63-4ef1-ab73-93c114d8ef6c rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto ...
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35 views

CPU Spikes when Untar'ing File on Virtual Server

I have a RHEL 5.5 on VMWARE running with 64GB Memory. When we untar a file (part of a daily process) the CPU Load sometimes spikes - rendering the server essentially nonresponsive. The disks are ...
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373 views

CentOS 5: is %wa too high or optimal?

i have question about waiting for HDD. I'm not sure what is optimal %wa. Server running browser game, i know that there is a lot hdd writing but im not sure what is optimal %wa. Server running 8 ...
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2k views

GlusterFs - high load 90-107% CPU

I try and try and try to performance and fix problem with gluster, i try all. I served on gluster webpages, php files, images etc. I have problem after update from 3.3.0 to 3.3.1. I try 3.4 when i ...
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174 views

How to disable specific CPUs in Linux 2.6.26.2

I have an old machine running Linux kernel 2.6.26.2 which is behaving oddly. I suspect ONE of the CPUs is possibly heating faster than the other. I want to run some tests with specific CPUs/cores ...
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70 views

lighttpd CPU utilization fails to decrease when load reduced

I have a lighttpd server which easily handles about 800 concurrent connections. But there seems to be a problem: When the number of users grows, the CPU utilization grows as well, until a limit is ...
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333 views

top command occupied high cpu usage

My system is SUSE 10 and I observe that top occupies 57% CPU usage when I use it. I don't have too many processes: ps -eLf | wc -l 106 Here are top's stats: cat /proc/2913/stat 2913 (top) R ...
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281 views

pv_ops Kernel ignoring cpu hotplug under Xen 4 DomU

I have a Xen 4.0.1 DomU running Debian Squeeze with the stock 2.6.32-5 Kernel. When I add CPUs via xm-vcpu-set they correctly show up in /sys/devices/system/cpu but are not set online and ...
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354 views

proceses cpu load history

I would ask if there is some linux tool that can track load of each application process and save it to the log file. When something in linux system "eat" CPU to 100% and I want see what happend and ...
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455 views

Unsupported CPU installed

I got a pc which was in need for an bios upgrade. I downloaded the bios update from the HP site. After the installation/upgrade from the bios and we restarted te pc we got the error: ERROR: ...
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166 views

Dell Poweredge 6950 CPU Upgrade

Does anyone know if it's possible to upgrade the cpus in this server to Opteron 8354. In this German version looks like it's an option. ...
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50 views

IBM xSeries 306 CPU Speed

I have an IBM xSeries 306. The system has been flawless until a week ago. It's a Pentium 4 Dual Core CPU. The CPU speed is 3.20 gHz. Now, it shows 4.26 gHz or 2.16 gHz when the POST screen comes ...
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108 views

Dtrace Oracle show high fsflush on solaris 10

Solaris 10 - Oracle 11G in a zone Running mpstat , i've noticed that one CPU was at 100% used every 5 seconds for 5 seconds while all other CPU were fine, in used but nicely spread. 1 0 0 0 ...
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Does installing more CPUs (Intel) than indicated by “Max CPU Configuration” prevent all cores from being used?

I am looking at a server that has 4 physical processors, the Intel documentation indicates they are 6 core processors but this WMI query WMIC CPU Get NumberOfCores, NumberOfLogicalProcessors ...
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122 views

Dell Poweredge 2950 with E5430 Temperature

So I just picked up a few Poweredge 2950 servers and I have them set up with Windows Server 2012. I installed Core Temp to monitor CPU temperature. One server has a CPU operating temp of the following ...
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108 views

Which CPU metrics are more important for a 3D render node?

We're looking into adding about 50 nodes to our render farm at about $2,000 (+-$300) each. What I'm trying to figure out is which specs on a CPU are the most important for 3D rendering. We use 3DMax ...
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98 views

Using Perfmon counters only, how can I determine host CPU contention / overload?

I'm running VMWare and have an ESX host that is running at 100% CPU. I also have two Exchange 2010 CAS servers that are running at 100% CPU, Here are some additiona observations: The sum of the ...
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158 views

Nginx reverse proxy apache2 High CPU load

my server: 2x Intel Xeon 5506 2.13GHz 24 GB DDR3 RAM Debian 5.0.8 64-bit My server CPU is aroung 90% at 600 users and around 6 page views per second. There are 2 Sites on the server. One Forum with ...
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241 views

MIB2 SNMP OID to get physical CPU socket count?

I am trying to set up a monitoring system and I'm noticing that MIB-2 seems to only report the virtual CPU count (all cores+hyperthreading). I need to get the physical socket CPU count. Is there any ...
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545 views

Apache 2.2.16 with mod_php on Debian Squeeze CPU high load

Configuration: CPU 16 cores 14 GB RAM Apache 2.2.16 PHP 5.3.3-7 with enabled APC Apache mpm config: StartServers 50 MinSpareServers 50 MaxSpareServers 256 ...
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14 views

Understanding Logman - Processor Time

As part of a project I am working on, I have to monitor server/desktop performance to ensure there is no degradation as a direct result of my work. I thought I would set up some performance counters ...
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20 views

mpm worker - high server load

i have 10 wordpress site with this plugins : w3 total cache + wordpress seo my server load some time goes up. vps : 1gb ram , 4 cpu 2.6 mpm worker : StartServers 2 ServerLimit ...
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175 views

ksoftirqd causes very high cpu usage - server is sometimes completely unusable

the ksoftirqd process on my root (Ubuntu 12.04 x64 with kernel 3.11.6) causes occasionally a very high usage of the first cpu core (sometimes only 5 minutes, then 30 minutes long, ... it feels just ...
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61 views

Weird consistent EC2 CPU spikes

One of our m1.small EC2 instances, running a Node.js web server, regularly gets some CPU spikes. It doesn't seem to matter what the peak CPU reaches, but whenever our traffic approaches the max for ...
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94 views

Xen Kernel - Only One Core Showing

So I have a dedicated server running the Xen kernel but for some reason it only shows one core instead of 4? Does that mean that my VPS that is running is only getting access to the 1 core or do they ...
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66 views

Get an OpenVZ container's cpuload realtime in a bash script

I have a bash script which uses CPU cores rather intensively. Recently my VPS was suspended due to server load. The main reason is a cron job for a bash script which checks for Wordpress plugins and ...
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127 views

Why does Windows have such a loose processor affinity

A while back, I did some playing around with new Win2008 virtual machine and found some serious concerns. The server is Dell T610. 16gig, 4 core, 8 logical, 2.4ghz Xeon, 5600 series. ESXi 4.1.0 The ...
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92 views

Softirq has raisen without reason

Monitoring munin stats I found that on CPU's graph there was softirq value increased. What might be the reason? Currently I am experiencing problems with mysql cpu consumption. But how those things ...
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49 views

CPU Compatibility for Xen Cloud Platform

I have pool with current configuration of several servers: CPU: Intel(R) Xeon(R) CPU E5630 @ 2.53GHz RAM: 32Gb DDR3 Can I add the following server to pool if i'd like to keep all ...
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55 views

How to investigate Linux scheduler issues?

I have a Linux server process that should runs multiple threads at close to 100%, each on its own CPU. When I run the process on one server (see [1] below), the CPUs in question appear to stay pegged ...
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369 views

Ubuntu 12.04 64bit - What would cause high System CPU %sys during high MySQL loads?

128GB RAM, 32cores Xeon RAID 10 SSD. Mysql version is the latest 5.5 for Ubuntu 12.04 . We have a lot of queries - about 1800+ per second. During high MySQL load - 2700+% load on a 32 CPU system - ...
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98 views

cannot find high load cause

I cannot find high load cause. CPU usage is not high. Maybe disk is causing high i/o, but disk utilization is not that high too. The peaks around 4:30am is backup time and not that important.
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109 views

Cisco 7206vxr cpu reducing

I have a 7206VXR (NPE-G2) . At the rate of 140 kpps i gain 80% of cpu . So i looking for ways how to reduce it? So i want to turn off netflow(but don't want to this,monitoring is highly important for ...
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203 views

Why does CentOS Linux use cpu/core #1 so much more in a 4-core system?

I've been watching top and htop for awhile on a very active server and I am wondering why linux does not automatically use cpu affinity better? CPU #1 (actually core #1 of 4) is used much more ...
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64 views

ruby on rails process stuck at 0% cpu (Yes, 0%) on a leased VM

I have a leased openVZ linux vm over at chicagovps.net. I am trying to deploy a ruby on rails application on the same. The problem is: when I run the rails server process, I see that during server ...
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64 views

please assist me debug a stack trace

I am having an issue on a windows 2003 terminal server, where the system process is using a constantly high amount of CPU. I believe that it is the srv.sys that is causing an issue, but not quite ...
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158 views

Disk or CPU/RAM failure ? I can't figure it out

i'm having big trouble accessing my production servers (runnung xen); i recently bought brand new Western Digital (WD5000AAKX 500Gb) drives to replace the old drives; re-installed the system as it ...
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239 views

How to get the CPU speed (which maybe variant) on the fly?

I'm curious how to evaluate the current speed of a Amazon EC2 t1.micro instance, as there's burst time slots, the current CPU speed is not static determined, as shown in /etc/cpuinfo. Is there some ...
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Trying to setup cpulimit on apache instances and mysql

I've tried running cpulimit on my apache instances and mysql but the processes are still going over my limit. I've tried: sudo cpulimit -e /usr/sbin/apache2 -b -l 10 This confirms it's stopped a ...