topic Re: CPU hangup for Java aplication using Tomcat in Operating System - HP-UX

CPU hangup for Java aplication using Tomcat

Carlos Vanegas — Fri, 03 Dec 2004 13:09:07 GMT

Hi, I have:

java version "1.4.2.03"
HP-UX hp1 B.11.11 U 9000/800
hpuxwsTOMCAT.TOMCAT A.1.0.01.02 4.1.12 base
Two CPU 650 Mhz
4 GB RAM

My problem is when I check the process with top, I saw the CPU 100%, and the server only running Tomcat.
I'dont know if you know if I need to modify some parameters of kernel o ndd parameters??

Thanks for your help.
Carlos

Re: CPU hangup for Java aplication using Tomcat

RAC_1 — Fri, 03 Dec 2004 13:29:22 GMT

I think you should start with patches. Do you have all the patches installed that are recommanded for Java, Tomcat.

Anil

Re: CPU hangup for Java aplication using Tomcat

Carlos Vanegas — Fri, 03 Dec 2004 13:30:53 GMT

Yes, I ran collect.sh and install the patches recommended for HP and Java

Re: CPU hangup for Java aplication using Tomcat

RAC_1 — Fri, 03 Dec 2004 13:35:28 GMT

What is the process name that is hogging the cpu??

Anil

Re: CPU hangup for Java aplication using Tomcat

Carlos Vanegas — Fri, 03 Dec 2004 13:38:57 GMT

Only java, it's take 100% CPU

Re: CPU hangup for Java aplication using Tomcat

RAC_1 — Fri, 03 Dec 2004 13:43:11 GMT

Check if you have all patches for java mentioned in the following link.

http://www.hp.com/products1/unix/java/patches/index.html

Anil

Re: CPU hangup for Java aplication using Tomcat

Mark Greene_1 — Fri, 03 Dec 2004 14:57:49 GMT

Do a ps -ef|pg on a display set at 132 columns with autowrap enabled so you can see the entire command being executed. Also capture the pid.

Next, download and install lsof if you don't already have it:

http://hpux.cs.utah.edu/hppd/hpux/Sysadmin/lsof-4.73/

run lsof|pg and search for the PID. It should be referencing a tcp port it's listening on or connected to via l0. Next serach the same listing for all occurances of the port number to see if you have more than one process listening or trying to connect on that port.

Finally, run netstat -a|pg and serach for the port number to see if you can determine if there's a client connection to it. You should see the dns name of the system in question, and then you'll know who to go talk to in order to find out what's being run that's eating the system.

mark

Re: CPU hangup for Java aplication using Tomcat

Ronald Schwartz_1 — Sun, 05 Dec 2004 21:53:29 GMT

Also try HPjconfig http://www.hp.com/products1/unix/java/java2/hpjconfig/index.html
This will do all the checking for you and give an idea of what needs to be changed.