CPU performance with Nagios 3.2.3

[Javier González]

Thank you Yueh-Hung Liu,

Is it possible to discover what´s the problem with the Load, which processes
take all the CPU time periodically ???

Could i do something to improve the CPU usage ?


2011/7/19 Yueh-Hung Liu <yuehung.liu at gmail.com>

> 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/
> > _______________________________________________
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> > https://lists.sourceforge.net/lists/listinfo/nagios-users
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> 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
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> ::: Messages without supporting info will risk being sent to /dev/null
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