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Nmon CPU-MEM Utilization Differs With PS Command for Checking the Usage

  • 1.  Nmon CPU-MEM Utilization Differs With PS Command for Checking the Usage

    Posted Mon May 07, 2012 04:36 AM

    Originally posted by: aravinthsamy


    This is regarding the CPU/Memory utilization mismatch sync between NMON and ps command in aix. In below output we can find that memory is 96% utilized in nmon. But while trying to find which are all the process utilizing this 96%memory, we are unable to get the exact utilization for this 96%memory utilization. We are using the below ps command to find the exact 96%memory utilizing process,it just shows 1% mem for db2sysc. Where to find the remaining 95% memory utilizing process...This is the case for CPU also. Please provide us the suggestions/commands to get exact Memory/CPUutilization which needs to sync with NMON and PS commands or any relevant commands.
    NMON output for Memory

    Physical PageSpace
    ¦% Used 96.0% 7.6%
    ¦% Free 4.0% 92.4%
    ¦MB Used 7681.6MB 620.0MB
    ¦MB Free 318.4MB 7572.0MB
    ¦Total(MB) 8000.0MB 8192.0MB
    ¦
    ---

    Memory utilization using PS command
    1. ps aux |head -1; ps aux |sort -rn +3
    USER PID %CPU %MEM SZ RSS TTY STAT STIME TIME COMMAND
    dbuser 909464 4.3 1.0 72616 59460 - A May 04 427:59 db2sysc 0
    svcagent 979112 0.0 0.0 140 144 - A 00:00:40 0:00 sleep 86400
    svcagent 975012 0.0 0.0 140 144 - A 11:48:15 0:00 sleep 30
    svcagent 880728 0.0 0.0 792 828 - A 10:31:30 0:00 /bin/sh /usr/svc
    svcagent 770108 0.0 0.0 11548 11556 - A 10:31:31 0:04 java -Xbootclass
    svcagent 725000 0.0 0.0 108 112 - A 11:48:14 0:00 sleep 10
    svcagent 700442 0.0 0.0 96 104 - A 10:31:31 0:00 /usr/svcagent/cm
    svcagent 504054 0.0 0.0 772 440 - A Apr 27 0:00 /bin/sh /usr/svc
    svcagent 499956 0.0 0.0 788 448 - A Apr 27 1:26 /bin/sh /usr/svc
    svcagent 495858 0.0 0.0 772 420 - A Apr 27 0:46 /bin/sh /usr/svc
    ****************************
    Regards,
    Aravinth V
    #AIX-Forum


  • 2.  Re: Nmon CPU-MEM Utilization Differs With PS Command for Checking the Usage

    Posted Wed May 09, 2012 05:00 PM

    Originally posted by: SystemAdmin


    The memory is not only used for processes. It is also used by the system/kernel and for file caching.
    #AIX-Forum


  • 3.  Re: Nmon CPU-MEM Utilization Differs With PS Command for Checking the Usage

    Posted Wed May 09, 2012 06:51 PM

    Originally posted by: UNIX-OS


    Aix uses memory for file system cacheing, if process needs it will take it from file system cache. do you see large amount of paging activity?

    use nmon or download perfpmr and look at detailed memory usage.

    ftp://ftp.software.ibm.com/aix/tools/perftools/perfpmr/
    perfpmr.sh -x memdetails.sh
    #AIX-Forum


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