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    SubjectRe: SMP performance degradation with sysbench
    On 3/12/07, Anton Blanchard <anton@samba.org> wrote:
    >
    > Hi Nick,
    >
    > > Anyway, I'll keep experimenting. If anyone from MySQL wants to help look
    > > at this, send me a mail (eg. especially with the sched_setscheduler issue,
    > > you might be able to do something better).
    >
    > I took a look at this today and figured Id document it:
    >
    > http://ozlabs.org/~anton/linux/sysbench/
    >
    > Bottom line: it looks like issues in the glibc malloc library, replacing
    > it with the google malloc library fixes the negative scaling:
    >
    > # apt-get install libgoogle-perftools0
    > # LD_PRELOAD=/usr/lib/libtcmalloc.so /usr/sbin/mysqld

    Quick datapoint, still collecting data and trying to verify it's
    always the case: on my 8-way Xeon, I'm actually seeing *much* worse
    performance with libtcmalloc.so compared to mainline. Am generating
    graphs and such still, but maybe someone else with x86_64 hardware
    could try the google PRELOAD and see if it helps/hurts (to rule out
    tester stupidity)?

    Thanks,
    Nish
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