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Struts & Hibernate
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| | | memory leak in tomcat 5.0.16 ? | memory leak in tomcat 5.0.16 ? 2004-01-22 - By Dale, Matt
Back
There is a known memory leak in 5.0.16, I'd upgrade to 5.0.18 and see if this
fixes your problem.
Ta
Matt
-- --Original Message-- --
From: Torstein Nilsen [mailto:tor_tomcat@(protected)]
Sent: 22 January 2004 10:01
To: tomcat-user@(protected)
Subject: memory leak in tomcat 5.0.16 ?
I am developing an intranet for a housing
community using apache/tomcat and
mysql. It was put in production to 200 users a few
weeks ago and I noticed that
the java-proces (tomcat) was "growing" from 8%
memory usage when started to
over 50% (seen with top / ps aux).
When the mem-usage reach a certain level the
java-proces uses most of the CPU-
ressources as well - verbose:GC showed that this
is the GC trying to keep up.
This usually happens in a matter of 2-5 hours
depending on the Xmx-settings - the number of
active users / load seems to speed the process up
(not confirmed). Restarting
tomcat solves the problem for a while - but I
would prefer a better permament
solution.
System settings:
CPU: Pentium 1600 mhz
RAM: 512 MB
OS: Linux (Redhat)
Java: j2re1.4.2_03 / jikes
TOMCAT: 5.0.16
Connector:
org.apache.coyote.tomcat5.CoyoteConnector
(AJP/1.3)
CATALINA_OPTS: -Xmx200m -Xms200m
-Dbuild.compiler.emacs=true
(have tried 117 different settings)
At first I used tomcat 4 and j2sdk1.4.1_03 and the
"normal" javac-compiler.
I changed to jakarta-tomcat-5 (See http://cat-5.ora-code.com).0.16 / j2re1.4.2_03
and jikes - this seems to have
made the problem even worse. Before the update
tomcat could go for more than 12
hours whitout restarting - now I have to restart
every few hours.
The application is quite DB-intensive: Every 30
secs. a java-thread queries a
mysql-table with updated network-traffic data
(used for traffic-shaping). In
the same loop I SAX-parse a little XML-string
using the JDOM-API (I have read
about the StringBuffer-problem but this is not the
cause since I'm now using
j2re1.4.2_03 - right ?). I'm using
mysql-connector-3 (See http://tor-3.ora-code.com).0.9 as JDBC-driver and
protomatter-1 (See http://ter-1.ora-code.com).1.8 to pool DB-connections. In the
same loop I connect to a TCP-
socket on the local server.
I have done some profiling with HPJmeter and the
-Xrunhprof argument with
different settings. I'm a newbie in profiling but
these observations might be
useful:
-Using HPJmeter' "guess memory leaks" the top-4 (See http://top-4.ora-code.com)
suggested candidates are:
java.util.vector,
org.apache.commons.modeler.Registry  ,
org.apache.jk.core.MsgContext and
org.apache.coyote.Request
-"Residual objects" shows the following
top-4 (See http://top-4.ora-code.com)-classes (bytes):
int[] (10 MB)
char[] (4 MB)
java.lang.String (2 MB)
byte[] (2 MB)
Any help would be much appreciated...
Regards
Torstein Nilsen
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