topic Re: Performance Issues in Operating System - HP-UX

Performance Issues

Joel Filardi — Fri, 23 May 2008 13:02:51 GMT

I am running performance tests on my companys new web based app. When loading users, it runs fine for about a half hour and then gets slower and slower until it crashed. We also had 36 actual users that were training on the application experience the same thing. they all logged in and played around in the system and after about an hour, it just dragged from one page to another and we keep having to reboot the server. any ideas????

Re: Performance Issues

Patrick Wallek — Fri, 23 May 2008 13:08:49 GMT

What kind of system?
What version of HP-UX?
How much RAM?
How many CPUs?
What web server?
Have you checked memory usage and CPU usage? What about error logs?
/var/adm/syslog/syslog.log?

Re: Performance Issues

Sajjad Sahir — Fri, 23 May 2008 17:46:23 GMT

dearJoel
please execute the following command

Print_manifest

give me out put first

for u system information

thanks and regards

Sajjad

Re: Performance Issues

Dennis Handly — Sat, 24 May 2008 01:10:29 GMT

>Patrick: Have you checked memory usage and CPU usage?

Right. Do you have a memory leak that finally gets you out of memory?
Since it crashes, what's the cause? Out of heap space?
Does the memory usage grow when you watch with top(1)?

Re: Performance Issues

Joel Filardi — Tue, 27 May 2008 11:58:27 GMT

I am getting the answers that you all have asked. I noticed that once i run a load on the system, it does well for about 20 minutes to a half hour and then slows down to a crawl. Once the VUsers log out, the system is still slow for about 5 minutes and then goes back to normal.

Re: Performance Issues

Joel Filardi — Tue, 27 May 2008 16:37:40 GMT

RAM - 1 GB Heap size allocated to the JVM
Web Server - Websphere v6.1

Re: Performance Issues

Joel Filardi — Tue, 27 May 2008 17:52:13 GMT

yes we also get out of memory errors

Re: Performance Issues

Patrick Wallek — Tue, 27 May 2008 18:54:16 GMT

Well, it sounds like you need more RAM.

You still haven't answered a lot of the questions though. Is this actually on an HP-UX system? If so, what version?

Re: Performance Issues

TTr — Tue, 27 May 2008 21:36:51 GMT

1GB or memory seems very little for a JVM application environment. Those java processes use a lot of memory. There could be other problems but memory (which would lead to disk swapping) is probably one of them.