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iostat vs lparstat for cpu metrics

  • 1.  iostat vs lparstat for cpu metrics

    Posted Wed May 19, 2010 04:59 PM

    Originally posted by: rufenro


    I use a script that calls "iostat -t 1 2" then parses the ouptut and adds up the sys%, user%, and wait% to get the total percent of cpu usage. The script then saves that to a file which is loaded into a database for historical tracking/graphing.

    The problem I am running into is that my lpars are showing as a lot busier than I think they really are. I did a test where I ran the same script only using "lparstat 1 1" instead of iostat. These were both run out of cron at the same time on an LPAR running Oracle & AIX 5.3 TL9 SP2. Here are the most recent results with iostat - format is date/time,cpu%:
    05/19/2010 21:12,109
    05/19/2010 21:17,112
    05/19/2010 21:22,107
    05/19/2010 21:27,108
    05/19/2010 21:33,1
    05/19/2010 21:37,109
    05/19/2010 21:42,108
    05/19/2010 21:47,102
    05/19/2010 21:52,106
    05/19/2010 21:57,101

    Here are the same times/dates with lparstat:
    05/19/2010 21:12,58
    05/19/2010 21:17,53
    05/19/2010 21:22,59
    05/19/2010 21:27,56
    05/19/2010 21:33,40
    05/19/2010 21:37,58
    05/19/2010 21:42,52
    05/19/2010 21:47,53
    05/19/2010 21:52,57
    05/19/2010 21:57,52

    Why the huge difference? Which one is more accurate?
    #AIX-Forum


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