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nmon 11e and vmstat do not agree on %user, %system, %idle

  • 1.  nmon 11e and vmstat do not agree on %user, %system, %idle

    Posted Thu October 18, 2007 01:31 PM

    Originally posted by: SystemAdmin


    we are using nmon 11e on a 9119-595 in LPAR mode (single lpar).
    System configuration: type=Dedicated mode=Capped smt=On lcpu=96 mem=102656MB.
    THe AIX level is 5300-05.

    Recently we have noticed a significant difference in the CPU numbers (%usr, %system, and %idle) between nmon and vmstat. Typically nmon reports lower usage numbers than vmstat, lparstat, or topas. I see where nmon will show high usage on the odd numbered CPU's when we run the file through the analyser. And almost no usage on the even numbered CPU's. By averaging the CPU's does that account for the lower usage numbers? If so, does this mean that vmstat, et al do not average the CPU's?

    I would like to account for the difference in what vmstat shows and what nmon shows.

    vmstat output
    System configuration: lcpu=96 mem=102656MB

    kthr memory page faults cpu
    -----------
    ------------
    r b avm fre re pi po fr sr cy in sy cs us sy id wa
    13 0 16081553 5135886 0 0 0 25 120 0 23181 577212 112677 24 10 54 12
    12 0 16073397 5144410 0 0 0 51 601 0 23677 532822 82565 19 10 60 12
    nmon from about the same time

    CPU_ALL,T0111,10.0,3.7,10.5,75.8,,96
    CPU_ALL,T0112,10.2,3.4,9.5,76.9,,96


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