use deadline scheduler On Wed, 2004-02-04 at 00:25, Alan wrote: > Hi guys... still in the middle of getting a server cut over from debian > to gentoo and I just found some serious performance problems with mysql. > > My new hardware is a dual p3 1.13Ghz system with 2G of ECC ram running > kernel 2.6.1 (gentoo-dev-sources) with preempt compiled. > > The current hardware is an athlon XP1800 with 1G of ram running 2.4.24. > > Running apache benchmark (ab -n 1000 -c 50 http://blah/) on both boxes > on a non-database intensive page shows the new hardware to be about twice > as fast as the old (expected as it's got dual CPUs). > > However, when I load a search page on the UBBThreads (php based forums) > board that is running on the box and do a long search ("this and that or > the other thing") I see a HUGE performance hit :( > > Based on 'time wget "http://url-with-search"; -O /dev/null' the query on the > old box take about .13s but on the new (stage 2 set up and fully tuned) > server take 39s!!!!! > > I ran "ab -n 1000 -c 5 <search url>" and it's *still going* while on the > old box (debian unstable) it's been done for ages. Not only that but > the load from running ab is up to 7.6 on the gentoo box but barely > blipped on the old system. > > The new system has Mysql 4.0.16 and is compiled with CFLAGS of: > -O2 -march=pentium3 -fprefetch-loop-arrays -funroll-loops -pipe > and USE flags of: > -static +readline +innodb +berkdb +tcpd +ssl +perl -debug > > Currently using the example my-huge.conf file for my configuration. > > The old system is debian mysql-server version 4.0.14-1. > > Any clue as to what could be making it so slow? -- Regards, Redeeman () ascii ribbon campaign - against html e-mail /\ - against microsoft attachments
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