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On 3/13/07, Eric Dumazet <dada1@cosmosbay.com> wrote: > 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 ? Hopefully soon -- want to still make sure I'm not doing something dumb. Am also hoping to get some of the gdb backtraces like Anton had. Thanks, Nish - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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