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From "David Boyer" <Da...@bvu.edu>
Subject RE: Tomcat/Java and SMP
Date Fri, 03 Dec 2004 18:31:43 GMT
So these are 10 separate boxes?
 
I think the clarification is necessary because "application server" in
the context of java usually refers to the J2EE or (sometimes) servlet
container. Are you taling about 10 instances of tomcat each running on
their own box?

>>> Dan.Foreman@epillar.net 12/3/2004 11:20:55 AM >>>

10 application servers. 

-----Original Message-----
From: Kwok Peng Tuck [mailto:pengtuck@gmail.com] 
Sent: Friday, December 03, 2004 6:53 AM
To: Tomcat Users List
Subject: Re: Tomcat/Java and SMP

Dan,
    U have 10 application servers on one machine or 10 application on
10 distinct machines ?

Dan Foreman wrote:
> 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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