Hi There,
Java and Tomcat are both multi-threaded applications. So they are both
using more than one CPU.
If it is using 50% of one processor then it is using 100% CPU on that
processor, since its 50% of the actual processing capacity.
Thanks
Pete
-----Original Message-----
From: Jens Ove Lillegraven [mailto:[EMAIL PROTECTED]
Sent: 12 November 2003 15:17
To: [EMAIL PROTECTED]
Subject: How to tune Tomcat and Java?
Hi,
We have a problem in that the Tomcat (java) process is the bottleneck and is
using only one CPU.
There will be high load on the server when it is put online, so we are
stress testing it offline now. Using the top command in Linux during the
stress test, it seems that java is the bottleneck of the system. But it uses
not 100%, but about 45-50% of one CPU. We get no http error, the page
performance (pages pr. second) is just getting worse as we put on more
stress load. The max memory consumption is set to 300M, but I've never seen
java using more than 111M. I suppose the throughput would have increased if
both CPUs could be used, but is Java (Tomcat) a single processor
application? The network throughput has a maximum average of 500kbps
(kilo-bits) during the stress test, and should manage much more.
Anyone who know how to make java and Tomcat performing better?
Details of hardware and innstalled applications:
Compaq ProLiant 6000, 2 x PII Xeon 400MHz, 1,3GB RAM
Red Hat Linux Enterprise 3 ES
J2EE: j2sdkee-1_3_1-linux
J2SE: j2sdk-1_4_2_02-linux-i586
Tomcat: 4.1.24
MySQL: 4.0.16
Tuning Tomcat memory (done):
in /usr/bin/dtomcat4:
CATALINA_OPTS="-Xmx300M -Xms100M $CATALINA_OPTS $JPDA_OPTS"
MySQL has been tuned, and is running very well.
Thanks
Jens Ove
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