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From "Sean Dockery" <use...@sbdconsultants.com>
Subject Re: Tomcat performance on Windows versus Linux
Date Mon, 15 Dec 2003 17:42:16 GMT
Thanks, Tim, for the even handed response.

I'm not looking for a business case to choose one or the other, however; it
is certain that our customers will be deploying our application on both
Linux and Windows (and even Solaris).  I'm just looking to find out whether
or not OS service (TCP/IP stacks, threads, file I/O, etc...) implementation
differences between Linux and Windows have a significant impact on
performance and thus should be weighed accordingly.

I received a response in email from Peter Lin in which he details his
experience (which was very helpful; thank you, Peter).  I've read Peter's
article about performance tuning and a few other white papers as well, but I
haven't really seen anything in the past that focused on OS differences and
how those differences might affect the recommended approach to profiling and
tuning.

My conclusions from my readings so far:  Slow java code (i.e.: algorithms)
will be slow on any platform; change the implementation to make it faster.
Configurable behaviour dependent upon OS services (TCP/IP stacks, threads,
file I/O, etc...) should be tuned for the platform on which the application
will live.

PS:  I was sad to learn that the Tomcat Performance Handbook publishing date
would be postponed.  I would be thrilled if either you or Peter could tell
me that the book will see a printer's press anytime soon.

PPS:  Is there a wiki for this stuff anywhere?

"Tim Funk" <funkman@joedog.org> wrote in message
news:3FDDADA1.9090403@joedog.org...
> [I hate saying this since its rather very much like flambait but...]
>
> If its worth anything, I haven't had enough load on any of our apps to
know
> whether Linux or Windows is better. Instead, look at:
> *** - Maintenance - If your a windows shop - stay windows ***
> - Debugging - I think troubleshooting is easier on *nix systems (YMMV)
> - Comfort - If your comfortable with unix concepts - linux might be easier
> than windows
>
> -Tim
>
> Sean Dockery wrote:
>
> > I am planning to profile a web application on Windows XP (my development
> > platform).  I am curious as to whether or not different components in
Tomcat
> > and the JVM will behave differently (in a relative comparison) on Linux
> > (production platform) than Windows.
> >
> > For example, I have had a person tell me that threads under Linux are
more
> > performant than threads under Windows--leading to the corollary that web
> > applications under Linux are more performant than web applications under
> > Windows on the same hardware.  My guess is that this claim is based upon
the
> > supposition that thread/context switches under Linux are faster than
under
> > Windows.  I find the claim rather dubious because I've never seen data
to
> > support the claim, but doubt is not certainty.
> >
> > Is there any evidence that this claim and other component performance
> > differences between the Windows and Linux platform exist and are
significant
> > enough to throw my performance measurements out the "window".  :-)
> >
> > My concern is that I'll profile the application under Windows and tune
it,
> > but then find that my gains aren't as significant or maybe even
worthless
> > under Linux.




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