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    SubjectRe: SMP performance degradation with sysbench
    Nish Aravamudan a écrit :
    > 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)?

    I wish I had a 8-way test platform :)

    Anyway, could you post some oprofile results ?

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