Date: Tue, 17 May 2005 16:32:11 +0000 From: "michael luch" <michaelluch@hotmail.com> To: freebsd-questions@freebsd.org Subject: buffer cache size Message-ID: <BAY20-F14584390BE200DECAD409DBA160@phx.gbl>
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I think that the buffer cache on my system is not growing sufficiently and wonder if I can I tune it. Here's a snippet from the output of top on my system: Mem: 646M Active, 2905M Inact, 174M Wired, 121M Cache, 112M Buf, 5460K Free Swap: 512M Total, 192K Used, 512M Free I have a MySQL db that's more than 1GB in size. When I do a SELECT, mysqld becomes about 25%busy (fair enough, it's waiting for disk). However, I was expecting to see the Buffer Cache size (that's the 121M Cache I think) grow, and expected to see subsequent SELECTs cause mysqld become CPU bound, as data from the database should now be in the buffer cache. However, this is not the case. I have 2GB of inactive memory, but a small buffer cache and a disk bound mysqld :( Are there some tunables I should look at to allow the buffer cache to grow? All the searches I did suggested that the vm system should look after this itself. Thanks M _________________________________________________________________ Send a sexy animated wink with Messenger 7.0 - FREE download! http://messenger.msn.co.uk
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