james at jpri.com
Tue Aug 2 14:46:08 GMT 2005
Try enabling slow query logging, as well as maybe try to isolate if the
load is coming from any particular query...
If you are performing joins on the 1k+ rows table, maybe MySQL has ran
out of memory and is copying the query results to a tmp table on the
disk. Sometimes this can cause a jump in CPU usage... You can
determine if this is the case by mysqladmin processlist; it will say
something like "Copying to tmp table".
Check for slow queries though...
Troy Settle wrote:
> I've a 4-STABLE box on a Dual Xeon w/4GB and U320 RAID:
> 4.11-STABLE FreeBSD 4.11-STABLE #7: Fri Mar 11 20:24:25 EST 2005
> 10:05AM up 55 days, 14:38, 3 users, load averages: 1.07, 1.10, 1.13
> Running on this box, is MySQL 4.0.23a (a little outdated, I know). This
> MySQL server seems to run fine as long as I watch it, but as soon as I
> turn my head for a moment, it jumps up to ~97% CPU usage:
> 508 mysql 63 0 99M 51660K CPU0 0 306.9H 97.46% 97.46% mysqld
> It doesn't appear to be an IO issue, 300 samples from iostat show a max
> of 0.31 MB/s.
> It also doesn't appear to be a memory issue:
> 867M Active, 2354M Inact, 320M Wired, 192M Cache, 199M Buf, 40M Free
> Swap: 4096M Total, 16K Used, 4096M Free
> Through a number of samples from sockstat(1), I see ~20 connections to
> mysql at any given time. 5 for Courier's authdaemon, 3 for Exim, and
> ~12 for Apache/PHP. There are intermitant connections from Windows
> clients using MyODBC, but none are persistant. Restarting any/all of
> these processes does not cause mysql to ease up on the CPU. Only
> restarting MySQL will buy releif, but after a few weeks, it's right back
> to 97% CPU usage.
> The machine itself is completely responsive, mysql is completely
> responsive. The tables in question are flat, with only a few thousand
> entries in the largest. Queries range from simple to semi-complex.
> I can't identify the source of the load. Can anyone help? What should
> I be looking at?
> Troy Settle
> Pulaski Networks
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