RE: Session attributes -- JAVA400-L

The most accurate answer I can think of off the top of my head is: "It
depends."

How many objects are in the vectors on average? How big are those
objects? How much memory does your system have? How is your application
server configured to utilize the memory? How many users do you expect to
be using your application at the same time?

There are profiling tools out there for this sort of thing, but I have
never had the opportunity to use one. I just always tried to minimize
what I was keeping in the session, even if it meant re-writing something
so that it would go back to the DB for a quick query every time a
specific piece of data was needed instead of keeping it in memory (as
long as the performance trade-off was acceptable).

You can do things like adjusting the time out value for sessions, so
dormant session data doesn't hang around longer than makes sense, use
lazy object creation/instantiation so you don't populate a session with
a whole bunch of data related to a request, when they may only be after
the first little bit.

I know that isn't a terribly helpful answer, and maybe someone has a
better one (I hope so)... but if you are keeping just a couple KB of
data per user in memory, you are probably ok... as long as you are
careful to clean up the session at the appropriate time, and you have
the JVM setup so that GC happens at the optimal time... again, a
profiling tool would help a lot.

There are a lot of things that can affect this situation. A vague
answer, yes... but it does depend :)

Dan Feather
Silhouette/PinPoint R&D Programmer
Jack Henry & Associates, Inc.
dfeather@xxxxxxxxxxxxx

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx
[mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of RPower@xxxxxxxxxx
Sent: Friday, April 22, 2005 1:32 PM
To: Java Programming on and around the iSeries / AS400
Subject: Session attributes

Just curious here, but how can I tell how much memory my application is 
using because of the session attributes I have setup?  How much is too 
much?  Any industry standards as to what should and shouldn't be loaded 
into memory?  Right now I'm loading a couple vectors into memory,
nothing 
I consider to me too much, but I don't want to create an app that will 
crawl to a halt.  Thanks,

Ron Power
Programmer
Information Services
City Of St. John's, NL
P.O. Box 908
St. John's, NL
A1C 5M2
Tel: 709-576-8132
Email: rpower@xxxxxxxxxx
Website: http://www.stjohns.ca/
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