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From "Parsons Technical Services" <parsonstechni...@earthlink.net>
Subject Re: Tomcat/Java and SMP
Date Fri, 03 Dec 2004 04:17:33 GMT
Dan,

Did you start the second connection from the same machine?

Doug


----- Original Message ----- 
From: "Dan Foreman" <Dan.Foreman@epillar.net>
To: "Tomcat-User" <tomcat-user@jakarta.apache.org>
Sent: Thursday, December 02, 2004 10:40 PM
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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> 



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