[HPADM] 8420 VPARs running with High load on CPU0 and low load on all other CPUS

From: James J. Perry (jjperry_at_water.com)
Date: 03/18/05

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    Date: Fri, 18 Mar 2005 14:50:48 -0500
To: <hpux-admin@dutchworks.nl>

    I have an 8420 with 2 npars. Each npar has 2 vpars.

     

    What I have noticed once I put Oracle Apps on one of the vpars (2 CPU,
    16 GB ram), is that CPU 0 has a load of 20 and CPU 1 has a load of 0-5.
    CPU Utilization is evenly distributed over both CPUs. I have noted the
    same behavior on most of the active vpars in use. Here are "sar -u -M
    5 5" and "sar -q -M 5 5" from one of the vpars.

     

    sar -u -M 5 5

    13:55:22 cpu %usr %sys %wio %idle

    13:55:27 0 41 7 0 51

                   1 45 6 1 49

              system 43 6 1 50

    13:55:32 0 46 4 3 47

                   1 37 13 1 49

              system 42 9 2 48

    13:55:37 0 46 8 0 46

                   1 53 13 0 34

              system 50 10 0 40

    13:55:42 0 45 4 1 51

                   1 39 12 0 49

              system 42 8 0 50

    13:55:47 0 21 6 2 72

                   1 30 5 1 64

              system 25 6 1 68

     

    Average 0 40 6 1 53

    Average 1 41 10 1 49

    Average system 40 8 1 51

     

    sar -q -M 5 5

    14:44:50 cpu runq-sz %runocc swpq-sz %swpocc

    14:44:55 0 8.8 100

                   1 0.0 0

              system 8.8 50 0.0 0

    14:45:00 0 4.0 40

                   1 3.2 80

              system 3.5 60 0.0 0

    14:45:05 0 31.0 20

                   1 5.7 60

              system 12.0 40 0.0 0

    14:45:10 0 8.0 100

                   1 3.5 40

              system 6.7 70 0.0 0

    14:45:15 0 3.7 60

                   1 4.6 100

              system 4.2 80 0.0 0

     

    Average 0 8.4 64

    Average 1 4.3 56

    Average system 6.5 60 0.0 0

     

    This is also see in Top and Glance.

     

    Glance

    ************************************************************************
    ********

     

                                    CPU BY PROCESSOR
    Users= 4

    CPU State Util LoadAvg(1/5/15 min) CSwitch Last Pid

    ------------------------------------------------------------------------
    --------

      0 Enable 60.8 18.4/ 18.2/ 18.8 2592 13070

    1 Enable 60.8 3.0/ 2.8/ 3.1 3348 12726

     

     

    Top

    ************************************************************************
    ********

     

    Load averages: 10.35, 10.46, 10.90

    429 processes: 389 sleeping, 39 running, 1 zombie

    Cpu states:

    CPU LOAD USER NICE SYS IDLE BLOCK SWAIT INTR SSYS

     0 17.75 31.7% 0.0% 0.0% 68.3% 0.0% 0.0% 0.0% 0.0%

     1 2.96 47.5% 0.0% 0.0% 52.5% 0.0% 0.0% 0.0% 0.0%

    --- ---- ----- ----- ----- ----- ----- ----- ----- -----

    avg 10.35 39.6% 0.0% 0.0% 60.4% 0.0% 0.0% 0.0% 0.0%

     

     

     

    This is really uncharacteristic for any Unix server I have administered.
    I see the CPU utilization about even most of the time, but the CPU 0 has
    a very high run queue. No users are complaining and it seems that all
    of the processes are getting run in a reasonable amount of time. Has
    anyone seen this type of behavior before? Is it related to running in a
    VPAR?

     

       Thanks

       -Jim 

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