CPU performance with Nagios 3.2.3

[Yueh-Hung Liu]

maybe you can check out the cron table to see what are running periodically.
but i think the load is no problem, unless the value remains very high
for a long time.


2011/7/20 Javier González <jagonzalaz at gmail.com>:
> 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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>> > any issue.
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>> >
>>
>>
>> ------------------------------------------------------------------------------
>> 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
>
>
> ------------------------------------------------------------------------------
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> http://www.accelacomm.com/jaw/sfnl/114/51426210/
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------------------------------------------------------------------------------
10 Tips for Better Web Security
Learn 10 ways to better secure your business today. Topics covered include:
Web security, SSL, hacker attacks & Denial of Service (DoS), private keys,
security Microsoft Exchange, secure Instant Messaging, and much more.
http://www.accelacomm.com/jaw/sfnl/114/51426210/
_______________________________________________
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Nagios-users at lists.sourceforge.net
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::: Messages without supporting info will risk being sent to /dev/null