Re: PgSp and Paging Space

cbaker_at_GOODYEAR.COM
Date: 11/09/05

  • Next message: SUBSCRIBE aix-l Tina N: "Re: PgSp and Paging Space" 
    Date:         Wed, 9 Nov 2005 15:06:19 -0500
To: aix-l@Princeton.EDU

    Tina,

    Thanks for the white paper on memory leaks.

    Let me tell you more about this error.

    The user is running as root. The program is CATIA v5, function is IGES
    translator. The OS is AIX 5.2 ML05

    He looked on the web for possible error and found a similar error in an
    APAR on the IBM site. It had a work around of making the following
    declaration before starting the IGES translation:

            export LDR_CNTRL=PREREAD_SHLIB@MAXDATA=0x70000000
            export EXTSHM=ON
            export JIMSHMATNUM=0

    Now the IGES process runs until topas shows 1792 in the PgSp column, then
    it dies.

    Here are some of the error in the different log files:

    1) In the "/CATReport/wide1.err" we see:

            <E> [9502] Memory Check is NOK : Low memory situation --> partial
    transfer processing.
            Low memory status file is partially transferred. Please increase
    your memory space.

    2) In the window that IGES was started from, we see these errors:

            XMLMode !!! </tmp//BatchParameters_11.39.02.xml>
            Local : <1>
     

            Warning : detected a low virtual memory condition
     
            Please close some applications
            +=============================================+
             ! An unhandled exception occurred in CATIA V5 !
            +=============================================+
            Terminating ...
            2 CATMfPartExtMLK stay in memory

    I still do not understand why "lsps -a" shows no SWAP failing. The memory
    data in "topas" does not imply either real or virtual memory is running
    out. So what is the "PgSp" column that shows 1179 now???

    Thanks,

    Christopher M. Baker
    Senior Technical Support Analyst
    DSE/TCO
    Goodyear Tire and Rubber Company

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    SUBSCRIBE aix-l Tina N <christina_lewis@NEXNET.NAVY.MIL>
    Sent by: IBM AIX Discussion List <aix-l@Princeton.EDU>
    11/09/2005 01:44 PM
    Please respond to
    IBM AIX Discussion List <aix-l@Princeton.EDU>

    To
    aix-l@Princeton.EDU
    cc

    Subject
    Re: PgSp and Paging Space

    maybe take a look at some of the vmtune parms.. maybe that will help.
    Also..I have this doc on memory leaks i have attached... it may have some
    useful tips in it...

    cbaker@GOODYEAR.COM
    Sent by: IBM AIX Discussion List <aix-l@Princeton.EDU>
    11/09/2005 01:25 PM

    Please respond to
    IBM AIX Discussion List <aix-l@Princeton.EDU>

    To
    aix-l@Princeton.EDU
    cc

    Subject
    PgSp and Paging Space

    Folks,

    I have an admin here who is trying to run a fairly simple command on AIX,
    but after a while, he gets an Out of Virtual Memory error and it dies.

    I changed all the ulimits to -1, that did not help.

    I had him run the command while I monitored the system with "topas". There
    I see that Paging Space never moves from 99% Free, but in the process (ps)
    section of topas, I see that his running process uses 25% of the 4-CPU
    server and, in the next column, labeled "PgSp", the number keeps on
    growing. When it gets nearly to 1024, the process dies.

    So, what is the difference between the Paging Space, ( same thing one gets
    from "lsps -a") that never grows and the "PgSp" in the processes section
    of "topas" that shows it is growing?

    This box is a P655 with 4 GB of real memory and 2 GB of swap.

    Thanks,

    Christopher M. Baker
    Senior Technical Support Analyst
    DSE/TCO
    Goodyear Tire and Rubber Company

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    May not be copied or disseminated without the expressed
    written consent of The Goodyear Tire & Rubber Company.
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    Relevant Pages

    • Re: PgSp and Paging Space
      ... memory that could be used for one process. ... Re: PgSp and Paging Space ... Now the IGES process runs until topas shows 1792 in the PgSp column, ...
      (AIX-L)
    • Re: PgSp and Paging Space
      ... Subject: PgSp and Paging Space ... On the -P out from topas, the Paging Space column shows the amount ... of memory that one process is using.. ...
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    • Re: PgSp and Paging Space
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    • Re: AIX Memory and Paging Space
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