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Date: Mon, 19 Jun 2006 17:23:06 -0400
From: "Alex Turner" <armtuk@gmail.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
Subject: Re: Tomcat's scalability
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Given that you aren't CPU bound, it's highly unlikely the problem is tomcat.

Alex.

On 6/19/06, Biernatowski Bartosz J <Bartosz.Biernatowski@rxsol.com> wrote:
>
> I am about 90% sure the bottleneck is Tomcat or what's running on top of
> Tomcat. Application uses JDBC queries to MS SQL server
> Chips are Intel Xeon. My monitoring data:
> Memory utilization under 30%, CPU under 10%. Using hardcore performance
> tools and systematic approach.
> The bottom line is that Tomcat/my application combo don't seem to handle
> more than a certain number of users. All I want to do is to up the # of
> users by 3.
>
> So far it sounds that the approach of adding separate instance of Tomcat
> and
> using round robin is better than adding a separate JVM.
>
>
> BJ Biernatowski
> Application Developer, e-Business
>
> -----Original Message-----
> From: Leon Rosenberg [mailto:rosenberg.leon@googlemail.com]
> Sent: Monday, June 19, 2006 10:49 AM
> To: Tomcat Users List
> Subject: Re: Tomcat's scalability
>
> are you sure that tomcat is your bottleneck?
> Your 4 CPU machine (which cpu's btw?) should be able to handle more
> than 1000 users (unless you are speaking about suns cpu) without
> problems. Maybe you should provide more info about your application.
> Do you have any monitoring data?
>
> Leon
>
> On 6/19/06, Biernatowski Bartosz J <Bartosz.Biernatowski@rxsol.com> wrote:
> > Hello,
> > I was hoping somebody on the list might point me in the right
> direction...
> >
> > I am trying to scale up Tomcat based web application currently
> supporting
> > ~100 users to 350 users.
> >
> > It seems that I have enough hardware: 2 load balanced servers x 4 CPUs
> each
> > with 4 GB of RAM which is underutilized for most of the time even though
> > application performance slows dramatically at peak times.
> >
> > I was advised to install multiple JVMs in order to improve Tomcat's
> > performance. Another option I considered was to install 2 instances
> > of Tomcat on each server to see whether it would handle increased load.
> >
> > Would anybody know what kind of performance improvement would multiple
> > JVM/Tomcat installations provide? Are there any benchmarks available?
> >
> > Thank you for any help!
> > BJ
> >
> > BJ Biernatowski
> > Application Developer
> >
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