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    SubjectRe: howto see shmem
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    On Mié 24 Oct 2001 20:37, Robert Love wrote:
    > On Wed, 2001-10-24 at 19:27, Martín Marqués wrote:
    > > [...]
    > > ------ Shared Memory Segments --------
    > > key shmid owner perms bytes nattch status
    > > 0x00000000 65536 nobody 600 46084 11 dest
    > > [...]
    > > I can see 46084 bytes in shared memory used by the apache.
    > > Am I wrong?
    >
    > Nope. Applications know how much the are sharing because they can
    > easily see what region of memory is shared/mapped into their's.
    >
    > The reason the kernel can't figure out the net shared memory is because
    > there is no simple way -- it has to add up the shared regions of all
    > applications, counting each shared segment only once. Too much work.

    Yes, I guess you are right. I just checked on and old RH server with a 2.2.x
    kernel, and the sum of the shared memory of each application doesn't give me
    the amount of shared memory that free gives me.

    Thanks to all!

    --
    Porqué usar una base de datos relacional cualquiera,
    si podés usar PostgreSQL?
    -----------------------------------------------------------------
    Martín Marqués | mmarques@unl.edu.ar
    Programador, Administrador, DBA | Centro de Telematica
    Universidad Nacional
    del Litoral
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