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From Gregor Schneider <rc4...@googlemail.com>
Subject Strange memory-behaviour using Tomcat Native
Date Thu, 08 Apr 2010 11:12:09 GMT
Hi there,

we do observer a strange behaviour of memory-consuption when running
Tomcat within native mode (via jsvc).

First, our configuration:

Using CATALINA_BASE:   /srv/someServer/catalina_base
Using CATALINA_HOME:   /srv/someServer/catalina_base
Using CATALINA_TMPDIR: /srv/someServer/catalina_base/temp
Using JRE_HOME:        /usr/lib/jvm/java-6-sun
Using CLASSPATH:       /srv/someServer/catalina_base/bin/bootstrap.jar
Server version: Apache Tomcat/6.0.26
Server built:   March 9 2010 1805
Server number:  6.0.26.0
OS Name:        Linux
OS Version:     2.6.26-2-686
Architecture:   i386
JVM Version:    1.6.0_12-b04

Besides, said Linux-bix is running within VMWare ESX Server 3i 3.5.0
build 123629

We specified the memory inside the startup-procedure as follows:


CATALINA_OPTS="-XX:MaxPermSize=384m -Xms512m -Xmx512m
-Djava.library.path=$CATALINA_BASE/bin/tomcat-native-1.1.20-src/jni/native/.libs
$JPDA_OPTS"

However, taking a look at memory-consumption using top gives the following:

top - 13:04:15 up 7 days,  1:15,  1 user,  load average: 0.06, 0.02, 0.00
Tasks:  72 total,   1 running,  71 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.5%sy,  0.0%ni, 99.3%id,  0.0%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:   3043600k total,   624960k used,  2418640k free,    95288k buffers
Swap:   329292k total,        0k used,   329292k free,   220852k cached

  PID USER      PR  NI  VIRT  RES  SHR  S   %CPU %MEM    TIME+  COMMAND
12712 tomcat    20   0   967m  77m  8068 S    0        2.6
0:06.84 jsvc

Oops - what am I missing here? My expectation where, that
CATALINA_OPTS are adhered to, even when starting Tomcat in native
mode. The max. memory-consuption I was expecting (in case MaxpermSize
is allocated completely would be some 896M. Btw., when giving Tomcat
1024m as Xms && Xmx, memory-footprint is around 1.6GB...

Anybody has an idea what I might be missing here?

TIA

Gregor
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