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From Vic <>
Subject Re: tomcat CPU utilization CPU only 50%
Date Fri, 04 Feb 2005 05:09:11 GMT
You could be DB bound or LAN bound.
What is the switch telling you LAN utilization is?
What is the DB stress test telling you?

Kevin Williams wrote:

>I am trying to performance test an application running Tomcat with
>Apache w/SSL (connected using mod_proxy).  The OS is Windows Server
>The test I am running is simulating a user logging into the application
>(using JMeter for the testing framework).  Increasing the number of
>users from 1, 2, 3, 4,5 the total CPU utilization jumps considerably.
>After 5 users the CPU utilization hits 50% for a second and then
>drops...When simulating 10 users, the CPU hits50% for a few seconds and
>drops back down, the more users, the longer the CPU is pegged at 50%.
>My question is why is tomcat only using 50% of the CPU?  Seeing the CPU
>grow significantly with each user, and then peg out for longer periods
>of time with an increased user load indicates that the CPU is the choke
>point.  Using performance monitor, the Tomcat % Processor Time pegs out
>at 100% for the duration that total CPU utilization is at 50%.  Is there
>a configuration option that I am unaware of to allow tomcat to use more
>Thanks in advance!

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