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Subject: RE: Tomcat load not distributed equally by Apache
Date: Tue, 15 Jul 2003 14:35:20 -0400
Message-ID: <3BAC15E02315BC4783152AC5E9621BB50191F7EF@trcexcsrv01.trcinc.com>
Thread-Topic: Tomcat load not distributed equally by Apache
Thread-Index: AcNK/nURVf3X5vcYQfWYGwIjxQOc9wAAUdOg
From: "Scott Burns" <sburns@trcinc.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>

Thanks very much Simon. :)  We will take a look at this.

Best Regards,

Scott

-----Original Message-----
From: Simon Pabst [mailto:simon.pabst@web.de]=20
Sent: Tuesday, July 15, 2003 1:25 PM
To: Tomcat Users List
Subject: Re: Tomcat load not distributed equally by Apache


We had the same problem, see this thread=20
http://www.mail-archive.com/tomcat-user@jakarta.apache.org/msg97638.html

Unless mod_jk Developers fix this, the only possible solution seems to
build and use Apache 2 with Multithreading support (i used the worker
mpm,=20
perchild should work too, see http://httpd.apache.org/docs-2.0/mpm.html
) then build mod_jk1/2 again with the new apxs.

I used for my Apache2/mod_jk2/mod_ssl:
httpd-2.0.47:
./configure --prefix=3D/path/to/apache2 --with-mpm=3Dworker --enable-ssl =

--enable-so --enable-rewrite --enable-proxy

tomcat-connectors-1.1M1-src:
./configure --with-apxs2=3D/path/to/apache2/bin/apxs [=20
--with-java-home=3D/path/to/java --with-jni ]


At 13:09 15.07.2003 -0400, you wrote:
>All:
>
>We have Apache 2 load balancing two tomcat 4.1.x workers. There are two

>primary applications running under tomcat. One app has long session=20
>times - eg the user logs-in in the morning and doesn't end their=20
>session until evening. The other app has short sessions - a connection=20
>is made, some work is performed, and they get out in under 3 minutes.
>
>Mod_jk is providing the load balancing via weighted round-robin. Both=20
>workers are equally weighted. In theory, each worker should have the=20
>same load distribution. (Truly in theory, each worker gets an=20
>equivalent number of sessions. Right? Our apps have sessions with a=20
>disproportionate number of transactions per session.)
>
>We see worker1 averaging higher CPU usage. I can justify this behavior=20
>because of session affinity being enabled -- and the huge difference in

>transactions per session in the applications.
>
>Two questions.
>
>(1) Am I missing something or are our assumptions wrong?
>
>
>
>(2) How could we distribute load to the tomcat workers via tomcat CPU=20
>usage instead of round-robin? Is there is a different Apache module=20
>that can load balance via tomcat CPU usage?
>
>Any help, guidance, direction you can provide would be greatly=20
>appreciated.
>
>Scott


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