Memory leak on 5.1-RELEASE?

From: dpk (dpk_at_dpk.net)
Date: 01/31/04

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To: questions@freebsd.org

    (I'm not a member of the list; please Cc me on any replies.)

    We're running Apache 1.3.28 on a 5.1-RELEASE machine. It's a Dell PE 2650
    w/ 2GB RAM. The site contains a lot of large files (multi-megabyte) -
    otherwise there's nothing unusual running.

    The Active memory use, according to top, seems rather high:

    last pid: 21487; load averages: 0.19, 0.33, 0.32 up 2+16:45:20 15:52:21
    76 processes: 1 running, 75 sleeping
    CPU states: 0.5% user, 0.0% nice, 4.0% system, 1.4% interrupt, 94.2% idle
    Mem: 1413M Active, 187M Inact, 299M Wired, 93M Cache, 112M Buf, 2632K Free
    Swap: 1024M Total, 21M Used, 1003M Free, 2% Inuse

    We can't seem to get the Active number down much, even after stopping
    Apache it still stays around 1100M. There's no shared memory in use, and
    nothing in vmstat -m seems to indicate where the "missing" memory is. top,
    sorting by "size", does not indicate anything unusual either.

    sysctl vm.vmtotal says:

    vm.vmtotal:
    System wide totals computed every five seconds: (values in kilobytes)
    ===============================================
    Processes: (RUNQ: 1 Disk Wait: 0 Page Wait: 0 Sleep: 76)
    Virtual Memory: (Total: 8172K, Active 636472K)
    Real Memory: (Total: 2051312K Active 389176K)
    Shared Virtual Memory: (Total: 16436K Active: 11760K)
    Shared Real Memory: (Total: 6004K Active: 4436K)
    Free Memory Pages: 79228K

    whereas on other servers, the Real Memory "Active" number seems to match
    the one found in top, on this one it is about 1GB lower.

    A similar machine running Apache on 5.1-R, generally serving smaller
    files, has the same problem in a smaller scale (about 640M even when
    Apache is stopped).

    Are there any other data that I should send to help diagnose this problem,
    or any programs I can run to try and track this stray memory use down?

    - dpk
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