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Subject: RE: Jsvc memory management experiences
Date: Sun, 15 Jan 2006 20:12:19 -0600
Message-ID: 
 <AEF3D568DD1D9E428048C592AA1645970362CAEB@USRV-EXCH4.na.uis.unisys.com>
Thread-Topic: Jsvc memory management experiences
Thread-Index: AcYaO5vLhpBZgNGvTwW4rc2r1Y2+SQABO2bQ
From: "Caldarale, Charles R" <Chuck.Caldarale@unisys.com>
To: "Tomcat Users List" <users@tomcat.apache.org>

> From: Marco Rossi [mailto:swmrrossi@yahoo.com]=20
> Subject: Jsvc memory management experiences
>=20
> I noticed that memory used is never released back to=20
> the system after the requests have been satisfied.

This is standard JVM behavior.  The JVM rarely shrinks the heap, and if
and when it does, shrinkage is only possible as part of a full garbage
collection.

> Is there anyoune who can point out some reccomdantions or=20
> hints about tomcat memory management ?

Sounds like you actually need to read up on JVM heap usage; Tomcat
doesn't do its own management.  This is a reasonable introduction:
http://java.sun.com/products/hotspot/docs/whitepaper/Java_HotSpot_WP_Fin
al_4_30_01.html

Look at the section on Garbage Collection under HotSpot VM Architecture.

 - Chuck


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