Re: MySQL Performance

steve.rieger_at_tbwachiat.com

Date: Tue, 2 Aug 2005 10:37:23 -0400
To: Troy Settle <troy@psknet.com>


--
Steve Rieger
AIM chozrim
ICQ 53956607
Cell 646 335 8915
steve.rieger@tbwachiat.com
On Aug 2, 2005, at 10:24 AM, 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 Running on this box, is MySQL 4.0.23a (a little outdated, I know).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?
>
> Thanks,
>
> --
>   Troy Settle
>   Pulaski Networks
>   http://www.psknet.com
>   866.477.5638
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Re: MySQL Performance

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