Date: Tue, 09 May 2006 10:35:06 -0700 From: Julian Elischer <julian@elischer.org> To: Sven Petai <hadara@bsd.ee> Cc: current@freebsd.org, freebsd-performance@freebsd.org, David Xu <davidxu@freebsd.org>, Kris Kennaway <kris@obsecurity.org> Subject: Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets) Message-ID: <4460D2CA.5090808@elischer.org> In-Reply-To: <200605091818.12676.hadara@bsd.ee> References: <20060506150622.C17611@fledge.watson.org> <200605090335.00451.hadara@bsd.ee> <20060509004203.GA55852@xor.obsecurity.org> <200605091818.12676.hadara@bsd.ee>
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Sven Petai wrote: are there any patches that take the gettimeofday() calls and replace them with something that is cheap such as only doing every 10th one and just returning the last value ++ 1 uSec for the other ones.. a ktrace of Mysql shows a LOT of gettimeofday() calls. >On Tuesday 09 May 2006 03:42, Kris Kennaway wrote: > > >>On Tue, May 09, 2006 at 03:34:59AM +0300, Sven Petai wrote: >> >> >>>>Hmm, with this patch mysql 4.1 seems to crash at startup. I haven't >>>>yet had time to investigate. Is anyone else seeing this? >>>> >>>> >>>Seems to run fine here with 4.1.18 on amd64, but doesn't seem to make >>>much difference though. >>> >>>I ran the tests again on the 8 core machine with and without rwatsons >>>patch and this time with 6 tests for each setting and generated graphs: >>>http://bsd.ee/~hadara/debug/mysql4/stats.html >>> >>>thr + select smack dynamics with the patch really do look quite >>>interesting >>> >>>PS >>>I'm currently running testround with rwatsons patch + >>>http://people.freebsd.org/~csjp/kern_descrip.c.1145074052.diff + mysqld >>>change davidxu suggested. >>>Are there any other patches out there that I should try ? >>> >>> >>Sorry, I meant >>http://people.freebsd.org/~csjp/sys.mpsafe.fileops.1145896495.diff >>instead of that patch. Also try turning down HZ to 100, and changing >>the wakeup()s to wakeup_one() in sys/filedesc.h. >> >> > >I preformed additional tests with the settings you suggested, >updated graphs are available @ >http://bsd.ee/~hadara/debug/mysql4/stats.html > > * with rwatsons patch + mysqld change suggested by davidxu + > http://people.freebsd.org/~csjp/sys.mpsafe.fileops.1145896495.diff > there doesnt seem to be much difference, but in general things seem to be >couple of percent better > mutex profiles for this configuration are available @ > with 10 smack threads: >http://bsd.ee/~hadara/debug/mysql4/freebsd_cur_ps2/mutex_freebsd_cur2_p2-select_10_10000.txt > with 100 smack threads: >http://bsd.ee/~hadara/debug/mysql4/freebsd_cur_ps2/mutex_freebsd_cur_p2-select_100_1000.txt > > * second run was with same patches, but HZ set to 100 > this helps performance a lot but creates large fluxuations in select results >with >20 threads + thr, sometimes difference between 2 runs with same >settings was 10000+ q/s > >I'm currently still testing wakeup() -> wakeup_one() suggestion. > >In addition I did full testrun on linux to see how much this hardware >is really capable of... graphs for that are available on the stats page too. >_______________________________________________ >freebsd-current@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-current >To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > >
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