Messages in this thread | | | Date | Wed, 14 Mar 2007 02:00:07 +0100 | From | Eric Dumazet <> | Subject | Re: SMP performance degradation with sysbench |
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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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