Determining what is causing a high load reportedby check_load plugin

[Kaplan, Andrew H.]

Hi there --
 
The load values that are displayed in top match those for the check_load plugin.
This is the case whether the plugin
is run either automatically or interactively. The output for the uptime command
is shown below:
 
8:48am  up 153 days, 23:21,  1 user,  load average: 73.36, 73.29, 73.21
 
 
 

________________________________

From: Daniel Wittenberg [mailto:daniel.wittenberg.r0ko at statefarm.com] 
Sent: Monday, December 06, 2010 4:40 PM
To: Nagios Users List
Subject: Re: [Nagios-users] Determining what is causing a high load reportedby
check_load plugin



In top, does it show the same load values?  The status of your memory shouldn't
cause the nagios plugin to report high cpu.  What does the uptime command say?
Try running the check_load script by hand on that host and verify it returns the
same results.


Dan

 

 

From: Marc Powell [mailto:lists at xodus.org] 
Sent: Monday, December 06, 2010 3:26 PM
To: Nagios Users List
Subject: Re: [Nagios-users] Determining what is causing a high load reported by
check_load plugin

 

 

On Mon, Dec 6, 2010 at 1:50 PM, Kaplan, Andrew H. <AHKAPLAN at partners.org> wrote:

Hi there -- 

We are running Nagios 3.1.2 server, and the client that is the subject of this
e-mail is running version 2.6 of the nrpe client.

The check_load plugin, version 1.4, is indicating the past three readings are
the following: 

load average: 71.00, 71.00, 70.95 CRITICAL 

The critical threshold of the plugin has been set to the 30, 25, 20 settings. 

When I checked the client in question, the first thing I did was to run the top
command. The results are shown below: 

CPU0 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle 
CPU1 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle 
CPU2 states:  1.0% user,  4.0% system,  0.0% nice, 93.0% idle 
Mem:  2064324K av, 2032308K used,   32016K free,       0K shrd,  509924K buff 
Swap: 2096472K av,   21432K used, 2075040K free                 1035592K cached 

The one thing that I noticed was the amount of free memory was at thirty-two
megabytes. I wanted to know if that was 
what was causing the critical status to occur, or if there is something(s) else
that I should investigate.


Memory is not a factor in the load calculation, only the number of processes
running or waiting to run. For at least 15 minutes you had approximately 71
processes either running or ready to run and waiting on CPU resources. Running
top/ps was the right thing to do but you really need to do it when the problem
is occurring to see what's actually using all the CPU resources. There are far
too many reasons why load could be high but it should be easy for someone
familiar with your system to figure it out (at least generally) while
in-the-act.

--
Marc



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