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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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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39 views

PostgreSQL queries slower than before?

I am using PostgreSQL 9.3 server on my production server. Everything had been working fine for the past couple of months. But since the past week or so, PostgreSQL seems to have becomes very slow with ...
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104 views

Strange CPU spikes with MySQL

On my server (ubuntu 12.04) mysqld started to show some strange CPU spikes. I've logged some of it as a sample: http://pastebin.com/4MwKUVwL The value after the triple dash '---' is the cpu usage ...
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84 views

Why does Apache split up the CPU for www-data processes out of 100 or 200?

It seems like Apache always splits up the CPU usage for www-data processes out of 100 or 200. Why is this? For example, one www-data process = 100% CPU usage: http://i.imgur.com/mfRuOSm.png Four ...
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79 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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174 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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491 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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254 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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103 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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82 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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34 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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286 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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1answer
44 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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85 views

Sudden increase in CPU usage and server response time

Over the past 10 days, I'm suddenly experiencing increased CPU usage on my website with CPU usage reaching 100% three times. During that time I'm unable to SSH to my website so I haven't been able to ...
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0answers
72 views

WPF application issues on AMD CPU vs Intel

I'm not sure if I should toss this on SO or not, I don't think its code based, so I'll start here. We are having an issue in the testing of our new product when using on an AMD CPU vs Intel. The app ...
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74 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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221 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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93 views

Amazon EC2 T2 Small Instance CPU Usage Exceeding Limits

I am running WHM/Cpanel on an CentOS6.5 AMI on a Amazon EC2 T2.micro Instance. T2 instance baseline performance and ability to burst are governed by CPU Credits. Each T2 instance receives CPU Credits ...
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159 views

Getting high CPU usage on EC2 running Plesk

I've been running Plesk on an AWS EC2 instance for over a year with no major issues. All of a sudden yesterday I start getting severe CPU spikes / periods which has made my uptime about 16% over ...
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102 views

Why my amazon m1.small ec2 instance goes 100% everyday at exact time

Not sure what is happening, my instance goes 100% CPU usage two exact times during the day one at 11:33 UTC and another at 3:38 otherwise rest of the day usage is under 10%. I didn't find: 1. Any ...
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72 views

Debian 100% cpu every 30 minutes but not loggable?

I have a Debian 7 x64 machine running with Digital Ocean that has every 30 Minutes a 100% cpu usage for about 1 minute. A couple of days ago it stayed there for a couple of hours so the server finally ...
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320 views

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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272 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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141 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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132 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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195 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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264 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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661 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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51 views

Increased CPU usage and server response time

Over the past 10 days, I'm suddenly experiencing increased CPU usage on my website with CPU usage reaching 100% three times. During that time I'm unable to SSH to my website so I haven't been able to ...
0
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0answers
64 views

Dual core CPUs stall with Docker on Ubuntu Linux

I have seen performance degradation after half an hour to one hour with machines running Celery (Django/Python), or Storm under Docker containers with Ubuntu base on Dual-core CPUs on AWS. I see ...
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38 views

Avira Webgate Troubleshooting: High CPU load

we are using Avira Webgate as Virusscanner for squid. We have two Servers running the Avira Webgate and see in both servers the same behaviour: The CPU is nearly always at 100% CPU whicht is fine on ...
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75 views

High CPU Utilization from apache tomcat

In our environment, we have two tomcat servers on a windows environment which are load balanced. Server 1 has normal CPU utilization whereas Server 2 has almost/more than double the CPU utilization of ...
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16 views

Machine Check Exeption

I got a Machine Check Exception error earlier, Does this mean my CPU is corrupt? What is the problem here? I keep getting this error randomly and the system shuts off.
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36 views

How to estimate server load?

I know a time of some cryptographic operation - let's say, for instance, it takes 0.4598s to perform a cryptographic action. I have a Intel Xeon 3.00GHz CPU (multi-core). How can I calculate (I skip ...
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97 views

What bus size does the armadaxp CPU with armv7l architecture of a Synology DS214 have?

less /proc/cpuinfo prints Processor : Marvell PJ4Bv7 Processor rev 2 (v7l) processor : 0 BogoMIPS : 1064.96 processor : 1 BogoMIPS : 1064.96 Features : swp ...
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229 views

HIGH CPU usage by PHP on a VPS Magento Server

My server running magento is 4gb ram and 4 core cpu. But still i am struggling with the high CPU usage. I only have 10 visitors at any given point of time. I am not sure if the PHP has to take this ...
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54 views

Efficient way to use maldet scanner

I don't know if this is the right place to ask this question or not. Sorry if this is not the right place. I have installed the maldet (Linux Malware Detect) scanner to scan malware from the server. ...
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76 views

Dell Poweredge R410 does not recognize second CPU

I have a Dell Poweredge R410 with two CPUs installed. I tried everything but the second CPU does not get recognized by the BIOS or the Linux Operating System it has. Both CPUs are Intel Xeon E5602 ...
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48 views

SNMP OID for CPU model information

I am currently trying to find the oid / way to gather the CPU model name from a server using SNMP. I have tried looking up the specific oid for it however all I could find were ones that related to ...
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28 views

False flag multibit errors on highest populated DIMM socket on second CPU of Sunfire x2200. Faulty CPU or faulty motherboard?

I'm testing 2GB ECC Registered DIMMs in a Sunfire x2200. Recently the system event log (SEL) began logging Multibit Errors on the highest populated DIMM socket on CPU1. With 8 DIMMs on CPU1, the SEL ...
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29 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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49 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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140 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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0answers
97 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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148 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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144 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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67 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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546 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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109 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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21 views

High IO wait when test disk with dd

My server is using two SATA disk Raid 1. I test disk using dd #!/bin/bash i=0 MAX_LOOP=10 while [ $i -lt $MAX_LOOP ] do dd if=/dev/zero of=/data/output bs=1G count=10 ((i++)) done ...