One of the issues that I have seen in the world of Java, is the
configuration of your network. If you have DNS servers that are not
configured properly, you will see very slow performance as there is a
timeout for these. No errors, just the code is waiting for the DNS to
respond, and then it proceeds. If the code is accessing something 50
times, that is 50 timeouts.

That would be the first thing I check.


Tim Rowe, timmr@xxxxxxxxxx
Business Architect Application Development & Systems Management for IBM i
IBM i Development Lab, Rochester, MN
(507) 253-6191 (Tie) 553-6191

----- Original message -----
From: "James H. H. Lampert" <jamesl@xxxxxxxxxxxxxxxxx>
Sent by: "JAVA400-L" <java400-l-bounces@xxxxxxxxxxxx>
To: Java 400 List <java400-l@xxxxxxxxxxxx>
Subject: Tomcat deploy/undeploy speeds
Date: Wed, Nov 2, 2016 3:25 PM

Fellow midrange geeks:

We have a number of customers for which we are managing Tomcat servers
on their own Midrange boxes (to run the web extension of our CRM

Differences in context deployment speeds is of course, in part, a
function of how long it takes to get a 101M WAR file onto their machine.
But that wouldn't be a factor in undeployment, nor in starting or
stopping a context.

And we're finding wide variations in those speeds: sometimes, a matter
of seconds, and sometimes you could go out and get coffee -- at the
Starbuck's around the corner -- and find that it's still processing.

Sometimes, we'll see variations this extreme on boxes that are at least
theoretically the same model. We've put Tomcat into its own subsystem,
with its own private pool, and "throw memory at it," with little or no
improvement in speed, and sometimes, we've seen boxes that look tiny and
underpowered give quicker responses than big heavy-duty models.

Anybody have any suggestions we haven't already tried?

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