64 bit AIX - increase SHMMAX??
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  1. #1
    Join Date
    Oct 2002
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    807

    64 bit AIX - increase SHMMAX??

    I have a 5G SGA that gets split up into 3 shared segments of 2G,2G and 1G.

    I assume it's happening because SHMMAX is set to a max of 2G at the kernel level. How do I up this to unlimited on AIX?

    Thanks.

  2. #2
    Join Date
    Jan 2001
    Posts
    2,828
    Hi

    shmmax Purpose: Specifies maximum shared memory segment size.
    Values: Dynamic with maximum value of 256 MB for 32-bit processes and 0x80000000u for 64-bit
    Tuning: Does not require tuning because it is dynamically adjusted as needed by the kernel.

    regards
    Hrishy

  3. #3
    Join Date
    Oct 2002
    Posts
    807
    Quote Originally Posted by hrishy
    Values: Dynamic with maximum value of 256 MB for 32-bit processes and 0x80000000u for 64-bit
    Tuning: Does not require tuning because it is dynamically adjusted as needed by the kernel.
    Thanks. So you're saying 3 shared segments of 2G,2G,1G is normal behavior (with a 5G SGA)?! And I needn't bother accomodating the SGA in a single shared memory segment?

  4. #4
    Join Date
    Jan 2001
    Posts
    2,828
    Hi

    With AIX yes.

    raise a TAR with metalink also and you can confirm this.

    regards
    Hrishy

  5. #5
    Join Date
    May 2000
    Location
    ATLANTA, GA, USA
    Posts
    3,135
    AIX does not have SHMMAX parameter.

    Tamil

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