Messages in this thread | | | Date | Tue, 13 Mar 2007 17:36:36 -0700 | From | "Nish Aravamudan" <> | Subject | Re: SMP performance degradation with sysbench |
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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)?
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