Re: Latency and Tomcat 3.2.4 -- WEB400

I haven't used Tomcat so pardon my ignorance on this one.  Does Tomcat
run as a module within the HTTP server job or is it a separate job that
the HTTP server calls/passes requests to?

I ask as WebSphere App Server runs as a separate job.  We had
performance issues with WAS so we created a separate memory pool for it
rather than for the HTTP instance.  That improved WAS performance
tremendously as it was no longer subjected to the paging that occurred
for other jobs.  The HTTP server is still in *BASE along with other
stuff.

John A. Jones, CISSP
Americas Information Security Officer
Jones Lang LaSalle, Inc.
V: +1-630-455-2787 F: +1-312-601-1782
john.jones@xxxxxxxxxx

-----Original Message-----
From: web400-bounces@xxxxxxxxxxxx [mailto:web400-bounces@xxxxxxxxxxxx]
On Behalf Of rbyrne@xxxxxxxxxxxxxxx
Sent: Thursday, October 26, 2006 3:22 AM
To: midrange-l@xxxxxxxxxxxx; web400@xxxxxxxxxxxx
Subject: [WEB400] Latency and Tomcat 3.2.4

Hi,

I've been looking into Tomcat on the iSeries for the past couple of
months. I've successfully migrated a small IIS application we use in
house to Tomcat rewriting it with Java/Jsp using the Struts framework. I
stress tested the application and the results where great i.e. circa
100ms for a response. We put the application into pilot production. What
we noticed was that due to the infrequent use of the application initial
requests had a very poor response time however subsequent requests were
fine. So in essence if the application was left idle for a period
analysis has shown that the idle interval doesnt necessarily have to be
a long one, the initial request is slow, so there is a lag. 

I've been trying all sorts to try and minimize/elimate the lag by
adjusting priorities, running tomcat inprocess/out of process, setting
up a seperate memory pool for my http instance. Our iSeries has
automatic tuning switched on and is tuned heavily for interactive. I've
been told by our iSeries admin that switching the automatic tuning off
is not an option.

I would like not having to resort to leaving a stress test running
constantly to keep the application responding.

I'm wondering if anyone has seen the following behaviour of if anyone
can suggest an explanation/solution.

Thanks and kind regards,
Robert.
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