Date: Sun, 12 Nov 2006 07:52:44 -0800 From: Julian Elischer <julian@elischer.org> To: Chris <chrcoluk@gmail.com> Cc: threads@freebsd.org, freebsd-current@freebsd.org Subject: Re: libpthread vs libthr. Message-ID: <4557434C.7080106@elischer.org> In-Reply-To: <3aaaa3a0611111503m319808cu7e1f710970350044@mail.gmail.com> References: <20061110151247.GA64530@zone3000.net> <3aaaa3a0611111503m319808cu7e1f710970350044@mail.gmail.com>
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Chris wrote: [...] > > > HI I posted in another thread about how my own experiences seem to > differ from all these benchmarks, they are based on 3 heavily loaded > web/mysql servers. > > One is freebsd 6.1 dual core cpu (not htt). 2nd is dual xeon freebsd > 6.1 and 3rd is another dual xeon freebsd 6.1. > > All 3 of these machines perform better as well as more stable under > higher loads using libpthread process scope. > > System scope appears to make mysql hog the system and everything slows > down except of course mysql. Is this libpthread "system scope" or libthr (which has system scope by default)? > > Libthr appears to make mysql very sporadic with some requests fast > others with a unexplained 5-10 sec delay including timeouts. > > Process scope on libpthread gives me the best results not making mysql > starve the server of resources and it has a consistent response time > of under 2 seconds under heavy loads. this is interesting.. there has been a call to remove "fairness" as a threading property as it complicates the scheduler. It has been said by many that they do not consider this as an important feature and it reduces throughput. > > I cant explain other then it maybe that test mysql data isnt a proper > way to test these threading libraries only real work loads can. > > Chris > _______________________________________________ > 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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