topic Re: CPU 100% usage in Operating System - HP-UX

CPU 100% usage

Kenn Chen — Thu, 10 May 2001 09:02:11 GMT

my CPU is 100% usage for 3 hours wihtout drop. any problem ??

Re: CPU 100% usage

Chin Guan — Thu, 10 May 2001 09:23:37 GMT

Use glance or top command to identify what are the processes using a lot of CPU and kill them if they are not suppose to be running in this system.

Re: CPU 100% usage

Thomas Pohlen — Thu, 10 May 2001 09:27:15 GMT

What to do if the kill doesnt work ?

newest GR and Pathes are installed. TOC the machine ?

Re: CPU 100% usage

Chin Guan — Thu, 10 May 2001 09:58:06 GMT

TOC is normally for system hang. I don't think it will tell much info regarding high CPU usage.

Re: CPU 100% usage

Paula J Frazer-Campbell — Thu, 10 May 2001 10:02:48 GMT

Hi

On a busy server the kill command will have to wait its turn and processing power to execute, so "kill does not work" usually means that it has not yet been given cpu time to execute.

By using Top pick up the hight cpu users and renice them down,

renice -n See man renice.

This will slowly bring the loading down.

High CPU usage can be caused by many things so you have to investigate - using tools like - top sar and glance to watch system activity.

HTH

Paula

Re: CPU 100% usage

Vincenzo Restuccia — Thu, 10 May 2001 10:25:34 GMT

Identify with top the process (>80%) and stop|start it.

Re: CPU 100% usage

Thomas Pohlen — Thu, 10 May 2001 11:15:08 GMT

ok, in my systems (K-Class) with HP-UX 10.20, GR from 2000 the systems hangs completely, renice didnt work as well as waiting for the kill command to be executed.

sar, top and glance are available, but when i use them i will see the curent status and not the status just before the system hang.

sometimes i get core files, sometimes not, strange for me...

Thanks Paula, regards

Re: CPU 100% usage

Preet Dhillon — Thu, 10 May 2001 11:24:58 GMT

Wait to see if you can renice the top processes as Paula suggests - if you're forced to TOC the machine, try disabling any automatic startup scripts in /etc/rc2.d and /etc/rc3.d before you issue the TOC. When the system reboots, start your startup scripts manually one at a time and monitor the system load after each one starts. This will help in identifying one or more of your applications which may be the cause of your problem.

Good luck and regards,
Preet