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Date: Tue, 20 Jun 2006 00:42:04 -0400
From: "Alex Turner" <armtuk@gmail.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
Subject: Re: Tomcat's scalability
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On 6/19/06, Leon Rosenberg <rosenberg.leon@googlemail.com> wrote:
>
> 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.
>
> Sounds like your db connection pool is the problem. Maybe you should
> check whether you have enough connections in the connection pool.


Connection pooling, ahh yes.  This is also a likely problem if you aren't
doing any.


>
> > So far it sounds that the approach of adding separate instance of Tomcat
> and
> > using round robin is better than adding a separate JVM.
> I think both options are equal. How do you plan to run a separate
> tomcat in the same JVM?


Both options are equaly stupid.  Putting multiple intances of tomcat on a
single box is pretty worthless unless you have serious application
problems.  Tomcat is multi-threaded, and will by nature utilize a multi-CPU
setup.


If you ask me (and hey, we have thousands of concurrent users and a
> lot more requests) you need a monitoring tool for your application
> inside your application not just vmstat or top. You need to know which
> servlet/action/whatever your presentation layer is takes the time and
> trace it down in the persistence. Everything else is just kindergarten
> :-)
>
>
> >
> >
> > BJ Biernatowski
> > Application Developer, e-Business
>
> Leon
>
> >
> > -----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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