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From Wade Chandler <wchand...@redesetgrow.com>
Subject Re: Tomcat/Java and SMP
Date Fri, 03 Dec 2004 19:40:35 GMT
Dan Foreman wrote:
> 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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> 
> 
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> 

Hmm do you mean you have 10 webapps and/hosts?  To me application 
servers means you are running multiple instances of tomcat which means 
you should have 10 different java.exe processes running.

Wade


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