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From Ben Ricker <>
Subject Re: Will Upgrade from one cpu to Dual CPU benefit tomcat 3.2.4 ?
Date Fri, 01 Nov 2002 21:03:58 GMT
I find that with databases in general, and MySQl in particular, that you
CPU is bound up in a io wait state, that is, waiting for disk reads
and/or writes. You may be disk bound. In that case, adding another CPU
will only give you nominal improvement.

You would need to check to see if I/O is the issue by checking the I/O
wait states and see if the kernel is just blocking the CPU waiting for
disk read/writes. If so, are you using SCSI? IDE? Got RAID? Striping
will improve the situation, as well as turning off mirroring disks, if
you have that setup.

Ben Ricker

On Fri, 2002-11-01 at 14:50, Brandon Cruz wrote:
> I have an overloaded linux server running Apache>Tomcat 3.2.4>MySQL.  It has
> 512MB Ram, which seems to be doing fine, but the 1Ghz CPU being used by
> Tomcat is constantly 35-60%.  Before I spend the money, does tomcat take
> advantage of multiple processors, and will it help me to upgrade to a Dual
> 1Ghz CPU machine?
> Brandon
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