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Full Discussion: Mpstat and sar
Top Forums Shell Programming and Scripting Mpstat and sar Post 302776827 by ptappeta on Thursday 7th of March 2013 02:49:50 AM
Old 03-07-2013
Mpstat and sar
HI I ma using mpstat and sar commands to check the cpu utilisation

but the results are not matching .I dont understand why thisis happening?

Code:
 
$ sar -u 12 5
Linux 2.6.9-89.35.1.ELhugemem (abcd.efgh.com)   03/07/2013
02:43:16 AM       CPU     %user     %nice   %system   %iowait     %idle
02:43:28 AM       all     41.91      0.00     57.86      0.00      0.23
02:43:40 AM       all     43.18      0.00     56.64      0.00      0.19
$ mpstat
Linux 2.6.9-89.35.1.ELhugemem (abcd.efgh.com)   03/07/2013
02:43:47 AM  CPU   %user   %nice %system %iowait    %irq   %soft   %idle    intr/s
02:43:47 AM  all   20.26    0.06   65.69    0.29    0.03    0.00   13.67   2534.05

so in this case mpstat saying 13.67% is idle where as sar is saying .19%
which one to trust
again when i use mpstat 12 5 ,it is giving correct.

Code:
 
$ mpstat 12 5
Linux 2.6.9-89.35.1.ELhugemem (abcd.efgh.com)   03/07/2013
02:44:56 AM  CPU   %user   %nice %system %iowait    %irq   %soft   %idle    intr/s
02:45:08 AM  all   36.71    0.00   63.02    0.00    0.02    0.00    0.25   1977.54
02:45:20 AM  all   38.90    0.00   60.77    0.00    0.06    0.00    0.27   3640.83
02:45:32 AM  all   38.86    0.00   60.75    0.02    0.02    0.00    0.35   2614.83
02:45:44 AM  all   67.70    0.00   32.19    0.00    0.02    0.00    0.08   2506.00
02:45:56 AM  all   62.68    0.00   37.28    0.00    0.04    0.00    0.00   1635.89
Average:     all   48.97    0.00   50.80    0.00    0.03    0.00    0.19   2474.71

 

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LEARN ABOUT CENTOS

sa2

SA2(8)								Linux User's Manual							    SA2(8)

NAME

       sa2 - Write a daily report in the /var/log/sa directory.

SYNOPSIS

       /usr/lib64/sa/sa2

DESCRIPTION

       The  sa2  command  is  a shell procedure variant of the sar command which writes a daily report in the /var/log/sa/sardd file, where the dd
       parameter indicates the current day. The sa2 command handles all of the flags and parameters of the sar command.

       The sa2 command is designed to be started automatically by the cron command.

EXAMPLES

       To run the sa2 command daily, place the following entry in your root or adm crontab file:

       5 19 * * 1-5 /usr/lib64/sa/sa2 -A &

       This will generate a daily report called /var/log/sa/sardd It will also remove reports more than one week old.

FILES

       /var/log/sa/sardd
	      Indicate the daily report file, where the dd parameter is a number representing the day of the month.

AUTHOR

       Sebastien Godard (sysstat <at> orange.fr)

SEE ALSO

       sar(1), sadc(8), sa1(8), sadf(1)

       http://pagesperso-orange.fr/sebastien.godard/

Linux								    AUGUST 2010 							    SA2(8)
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