CPU performance with Nagios 3.2.3

Yueh-Hung Liu yuehung.liu at gmail.com
Tue Jul 19 19:05:35 CEST 2011


load is not the same as cpu usage, load is the number of queued
processes in a period.
maybe there are processes waiting for some events, such as I/O.


2011/7/19 Javier González <jagonzalaz at gmail.com>:
> Hello,
> I have seen a lot peaks on the CPU LOAD of my nagios machine (See pnp4nagios
> graphs on pdf document attached).
> I don´t know which process/processes are the ones that use too much CPU on
> that periods because the PC is only used for Nagios (And plugins used with
> it) and all the plugins defined have a check_period of 1 minute and there is
> a lot of periods where the load is near to 0 (so what happens every 2 hours
> more or less that use so much CPU???)
> I have tried to find the process that causes this behavior with the "top"
> command but %Cpu idle is always (also on the peaks of the CPU LOAD) more han
> 70% and no process uses more than 4% of CPU (See three examples of TOP
> command where %CPU idle is always high but Load vary a lot on each case)
> ******************************************************************
> top - 11:52:27 up  9:51,  1 user,  load average: 0.09, 0.56, 0.62
> Tasks: 102 total,   1 running, 101 sleeping,   0 stopped,   0 zombie
> Cpu(s):  7.9%us,  1.5%sy,  0.0%ni, 88.4%id,  1.0%wa,  0.3%hi,  0.8%si,
>  0.0%st
> Mem:   2050176k total,   675704k used,  1374472k free,   132628k buffers
> Swap:  2096472k total,        0k used,  2096472k free,   333384k cached
> top - 13:30:05 up 11:29,  2 users,  load average: 1.53, 1.27, 0.83
> Tasks: 110 total,   3 running, 107 sleeping,   0 stopped,   0 zombie
> Cpu(s):  9.2%us,  1.5%sy,  0.0%ni, 88.6%id,  0.0%wa,  0.0%hi,  0.7%si,
>  0.0%st
> Mem:   2050176k total,   708540k used,  1341636k free,   139020k buffers
> Swap:  2096472k total,        0k used,  2096472k free,   334668k cached
> top - 13:16:39 up 1 day, 11:15,  2 users,  load average: 2.45, 2.03, 1.96
> Tasks: 106 total,   1 running, 105 sleeping,   0 stopped,   0 zombie
> Cpu(s):  7.8%us,  1.4%sy,  0.0%ni, 89.1%id,  1.0%wa,  0.2%hi,  0.5%si,
>  0.0%st
> Mem:   2050176k total,   845668k used,  1204508k free,   167244k buffers
> Swap:  2096472k total,        0k used,  2096472k free,   351224k cached
>
>
>
> ********************************************************************
>
> Is there some way to find wich process cause this high CPU LOAD ? (Which
> proccess use sometimes a lot of the CPU time so queuing other processes).
> Why sometimes the CPU Load is near to 0 and other times Load_1_min is near
> to 4 (On the example 2,45 but there are higher values) if the processes are
> always the same ???
> Thank you very much
> *****************************************************************************
> Environment Description.
> Intel Core 2 DUO E7500 / 2,93GHz
> DDR2 2GB / 667MHz
> Centos 5.5
> Nagios 3.2.3
> nagios-plugins-1.4.11
> net-snmp-5.6
> snmptt-1.3
> mklivestatus-1.1.8
> nagvis-1.5.6
> pnp4nagios-0.6.10
> ------------------------------------------------------------------------------
> Magic Quadrant for Content-Aware Data Loss Prevention
> Research study explores the data loss prevention market. Includes in-depth
> analysis on the changes within the DLP market, and the criteria used to
> evaluate the strengths and weaknesses of these DLP solutions.
> http://www.accelacomm.com/jaw/sfnl/114/51385063/
> _______________________________________________
> Nagios-users mailing list
> Nagios-users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nagios-users
> ::: Please include Nagios version, plugin version (-v) and OS when reporting
> any issue.
> ::: Messages without supporting info will risk being sent to /dev/null
>

------------------------------------------------------------------------------
Magic Quadrant for Content-Aware Data Loss Prevention
Research study explores the data loss prevention market. Includes in-depth
analysis on the changes within the DLP market, and the criteria used to
evaluate the strengths and weaknesses of these DLP solutions.
http://www.accelacomm.com/jaw/sfnl/114/51385063/
_______________________________________________
Nagios-users mailing list
Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null





More information about the Users mailing list