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    SubjectRe: [PATCH] lazy freeing of memory through MADV_FREE
    Jakub Jelinek wrote:
    > On Fri, Apr 20, 2007 at 07:52:44PM -0400, Rik van Riel wrote:
    >
    >>It turns out that Nick's patch does not improve peak
    >>performance much, but it does prevent the decline when
    >>running with 16 threads on my quad core CPU!
    >>
    >>We _definately_ want both patches, there's a huge benefit
    >>in having them both.
    >>
    >>Here are the transactions/seconds for each combination:
    >>
    >> vanilla new glibc madv_free kernel madv_free + mmap_sem
    >>threads
    >>
    >>1 610 609 596 545
    >>2 1032 1136 1196 1200
    >>4 1070 1128 2014 2024
    >>8 1000 1088 1665 2087
    >>16 779 1073 1310 1999
    >
    >
    > FYI, I have uploaded a testing glibc that uses MADV_FREE and falls back
    > to MADV_DONTUSE if MADV_FREE is not available, to
    > http://people.redhat.com/jakub/glibc/2.5.90-21.1/

    Hmm, I wonder how glibc malloc stacks up to tcmalloc on this test
    (after the mmap_sem patch as well).

    I'll try running that as well!

    --
    SUSE Labs, Novell Inc.
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