topic Re: user process takes 90% of CPU in Operating System - HP-UX

user process takes 90% of CPU

Ing. E. van Egmond — Mon, 26 Apr 2004 06:21:47 GMT

Since I've got a rp5430 running with HPUX 11.11 a problem occurs when an users starts a cobol program. This program takes around 90% CPU time and delays all other. I think it has something to do with waiting to get a lock on a file. My previous L1000 with 11.00 didn't had this problem. Anyone have an idea?
Also, the rp5430 is now connected to a SAN.

TIA,

Edward

Re: user process takes 90% of CPU

KapilRaj — Mon, 26 Apr 2004 06:30:18 GMT

Operating systems are backward compatible ... still look forward to get it compiled under 11.11

OR

Is there any additional load being put on to the system ?

Regds,

Kaps

Re: user process takes 90% of CPU

Ing. E. van Egmond — Mon, 26 Apr 2004 06:37:40 GMT

We've tried a recompilation, but it didn't had the desired effect. I'm more thinking in the line of a new kernel paarameter which can be the culprit.

I'm keeping an eye on the running processes with the highest CPU time, and nothing else effects this job.

Re: user process takes 90% of CPU

Bharat Katkar — Mon, 26 Apr 2004 07:52:58 GMT

Edward,
Along with the kernel parameters, i would also suggest u check patches.

Re: user process takes 90% of CPU

Hazem Mahmoud_3 — Mon, 26 Apr 2004 09:20:39 GMT

Try starting the cobol program with a lower priority (man nice for more information), and see what happens:

# nice -5

-Hazem

Re: user process takes 90% of CPU

Roberto Polli — Mon, 26 Apr 2004 09:28:44 GMT

Maybe check the ulimit function?
anyway "nice" should work...

Peace, R.

Re: user process takes 90% of CPU

A. Clay Stephenson — Mon, 26 Apr 2004 09:34:05 GMT

Well, rather than using "The Force" to lead you to waiting on a file lock I suggest that you use Glance to drill into the process to see what it is really doing. Another option is to use tusc.
http://hpux.connect.org.uk/hppd/hpux/Sysadmin/tusc-7.5/

One we know what the process is spending most of the time doing, it's much easier to offer helpful suggestions.

Nicing the process is really throwing a Band-Aid at the problem.

Re: user process takes 90% of CPU

Hazem Mahmoud_3 — Mon, 26 Apr 2004 09:47:34 GMT

Clay has a good point. Thanks for bringing that up. I guess a short-term solution would be to "nice" it, but like Clay mentioned, the problem would still exist.

-Hazem