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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: Tomcat/Java and SMP
Date Fri, 03 Dec 2004 14:15:43 GMT

Hi,
NTI: Not a Tomcat Issue.  Parallelization depends on the VM
implementation for your specific OS and might require special
configuration switches: consult your JVM documentation.

Yoav Shapira http://www.yoavshapira.com
 

>-----Original Message-----
>From: Dan Foreman [mailto:Dan.Foreman@epillar.net]
>Sent: Thursday, December 02, 2004 10:41 PM
>To: Tomcat-User
>Subject: Tomcat/Java and SMP
>
>Hi,
>
>I have a setup of 10 application servers using Tomcat 4/5, jsdk
1.4.2_02,
>SMP, win2k.  In watching the performance under load I am
>concerned that only one CPU is being utilized at a time.  To validate
my
>theory I try hitting the application server with a request
>to generate a large report and then making another connection.  The
second
>connection is painfully slow and task manager only
>reports a 50% CPU utilization.  After doing some reading on SMP/native
>threads and windows, I wrote a test java application that
>spawns n infinite loop threads from a single JVM with a delay between
each
>creation.  Sure enough one cpu (task manager reporting
>50%) and then the other cpu are consumed (task manager reporting 100%).
>This test tells me that Java is capable of using both CPU's
>via native threading and some black magic in the windows dll's but that
>this scenario isn't happening in tomcat.
>
>Is it possible for tomcat to use more than one CPU or is there a
critical
>flaw in my logic?
>
>-Dan
>
>
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