[WEB400] Re: Tomcat 4.1.24 on V5R1

["Joe Pluta" <joepluta@xxxxxxxxxxxxxxxxx>]

> From: Robert Upshall
>
> Hi again,
>
> My question now is, does anybody have any suggestions for speeding up
> Tomcat 4 on V5R1.  It is up and running now but it is much slower than
> Tomcat 3 was on the iSeries and alot slower than Tomcat 4 running on my
> laptop.  Should this be the case?  A PC running Tomcat faster than an
> iSeries?

Tomcat 4 should not be slower than Tomcat 3.  My original benchmarks on this
a while ago showed that 4 was consistently faster than 3 on with a simple
JSP/servlet load.

What are you running?  What does your application do?  What did the group
PTFs do?  Are you using IBM's Java Toolbox?  Had you done a CRTJVAPGM on
that JAR file?  Did the PTFs wipe that out?  How about the Tomcat JAR files?
Questions, questions, questions.

I'd suggest breaking your application into pieces and seeing where your
bottlenecks occur.  Write a servlet that just outputs HTML, and see how that
works.  Then go to a static JSP page that does the same thing, see how that
works.  Then start factoring in the application logic.

Do the standard things you do to track down performance problems - isolate,
investigate, identify and fix.

As to a PC running faster than the iSeries, in most cases a simple servlet
served to a single user will indeed perform better on the PC.  Why?  Because
typically the PC clock is faster than the iSeries and it's not required to
do anything else.  Performance comparisons between a PC and an iSeries don't
make sense until you put on a few dozen users and add some heavy database
I/O.

For testing I suggest a program called Web Roller, an incredible product
from a small company out of out of Novosobirsk.  Website:

http://www.webapplicationstesting.com/

Hope this helps get you started.

Joe