Date: Tue, 29 Jan 2008 15:27:11 +0100 From: "Claus Guttesen" <kometen@gmail.com> To: "Mike Tancsa" <mike@sentex.net> Cc: freebsd-performance@freebsd.org Subject: Re: postgresql-performance using sysbench Message-ID: <b41c75520801290627v43d869eue29d8faefb58ce10@mail.gmail.com> In-Reply-To: <200801291418.m0TEIbsw076723@lava.sentex.ca> References: <b41c75520801280701x35e628dk90841b55cac77045@mail.gmail.com> <fnl35p$hnj$1@ger.gmane.org> <200801281024.11571.darcyb@commandprompt.com> <b41c75520801281221i5fbb32f3p1e2f3be40a8dfa74@mail.gmail.com> <479E3C5E.1070405@FreeBSD.org> <b41c75520801281246q16d305ecue915e66bea6ac5ab@mail.gmail.com> <200801291418.m0TEIbsw076723@lava.sentex.ca>
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> >I had (allready) saved the thread in my mail-account so I could look > >it up before I started testing. :-) So I compiled postgresql with the > >option WITH_THREADSAFE=true and used sysbench with --pgsql-host="" . > >As pointed out by Ivan my test also involved r/w whereas the thread > >you (probably) mention at > >http://groups.google.com/group/mailing.freebsd.stable/browse_thread/thread/e224cd4f76e9ec2d > >is a read-only test. > > > >I forgot to mention in my first post that I'm using ULE. The p800 > >controller has a (factory set) 25/75 read/write cache ratio. > > > I am still going through my own testing. One thing I noticed, on a > 4G RAM machine (still waiting for the RAM to test with 8G), the disks > are not that busy. It seems to be the CPU that is the bottleneck on > FreeBSD. I tried the test with 900,000 rows instead. > > procs memory page disks faults cpu > r b w avm fre flt re pi po fr sr ad5 > da0 in sy cs us sy id > 38 1 0 271024 3439656 6329 0 0 0 4 0 0 1703 1709 > 120725 41505 44 18 37 > 0 38 0 271024 3438860 9590 0 0 0 8 0 0 1932 1938 > 183844 47958 70 28 3 > 6 33 0 271024 3438120 7814 0 0 0 0 0 0 1823 1827 > 169969 44914 62 25 13 > 39 0 0 271024 3437960 1530 0 0 0 0 0 0 994 998 36521 > 14927 13 8 79 > 38 1 0 271024 3437244 7374 0 0 0 0 0 0 2724 2731 > 173493 51821 71 20 9 > 0 39 0 271024 3436620 4773 0 0 0 8 0 0 2727 2734 > 125699 39962 47 20 33 > 37 1 0 271024 3435836 6884 0 0 0 8 0 0 2796 2804 > 177453 58430 70 26 4 > > I am also using ULE, pgsql with WITH_THREADSAFE=true and not using > TCP to connect. How busy were your disks in your testing ? Approx. 15-25 MB with spikes at approx. 45-50 MB. Context-swithces were sometimes 140.000 with 20-30 clients (systat -vmstat 1). -- regards Claus When lenity and cruelty play for a kingdom, the gentlest gamester is the soonest winner. Shakespeare
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