Hi.
I have a Linux system like so :
Linux arthur 2.6.26-2-686 #1 SMP Mon Aug 30 07:01:57 UTC 2010 i686 GNU/Linux
with a tomcat like so :
Using CATALINA_BASE: /usr/share/tomcat5.5
Using CATALINA_HOME: /usr/share/tomcat5.5
Using CATALINA_TMPDIR: /usr/share/tomcat5.5/temp
Using JRE_HOME: /usr/lib/jvm/java-1.5.0-sun
Server version: Apache Tomcat/5.5
Server built: Oct 15 2008 12:57:44
Server number: 5.5.26.0
OS Name: Linux
OS Version: 2.6.26-2-686
Architecture: i386
JVM Version: 1.5.0_22-b03
JVM Vendor: Sun Microsystems Inc.
(Java JDK installed)
and where night and day, tomcat seems to be using a fair amount of CPU time,
like so :
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2901 tomcat55 20 0 459m 285m 16m S 13 32.3 354:39.13 java
although by all means, it should not be doing that much sometimes.
How can I figure out what it is actually doing ?
I mean, which is the easiest standard tool or procedure not requiring a degree in quantum
physics, and which could give me at least a rough idea of which webapp or internal tomcat
process is keeping that CPU busy all the time ?
I have a nagging feeling that someone is going to tell me to take thread dumps. If so,
maybe they would also kindly point out a place where I could find some instructions as to
how to interpret such a thing ?
Thanks
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