topic Re: K class CPU performance in Operating System - HP-UX

K class CPU performance

Kevin Dillon — Thu, 27 Sep 2001 13:52:56 GMT

No pressure but HEEEELLP!!

I've a K360 with 3 processors, 1Gb memory and 2Gb swap, running oracle 8 on HPUX11.
When the CPU till exceeds 90% for protracted periods the run queues remain low (2-3max).
These peaks can last for hours as invoicing routines run.
I've checked the kernel for the typical Oracle related config changes and all seems within tolerances.
Has anyone any ideas of how to approach investigating such a problem so as not to miss anything obvious.

for information we have glance installed.

Re: K class CPU performance

Sanjay_6 — Thu, 27 Sep 2001 13:57:45 GMT

Hi, Kevin,

Have a look at the thread below,

http://us-support2.external.hp.com/cki/bin/doc.pl/sid=f3e84e7e17e3970ec0/screen=ckiDisplayDocument?docId=200000056493259

Hope this helps.

thanks

Re: K class CPU performance

James R. Ferguson — Thu, 27 Sep 2001 14:07:56 GMT

Hi Kevin:

High CPU utilization with a low run queue isn't necessarily bad. A single process on a server can consume 100% of the CPU and that wouldn't be bad at all. High utilization simply means taht the processor is being used. A deep run queue in addition may mean starvation for the processor. High I/O activity will lower CPU utilization as processes wait for I/O completion.

The document that Sanjay references is a good. Use it, along with 'glance' and other tools like 'sar' to begin to gain a view of your environment.

Regards!

...JRF...

Re: K class CPU performance

Kevin Dillon — Thu, 27 Sep 2001 14:44:25 GMT

Sanjay/ James
as always, thanks for your interest.
I'm unable to access that url for the document ( could be because I'm registered on the europe ITRC?)
any other pointer to it?

Kevin.

Re: K class CPU performance

linuxfan — Thu, 27 Sep 2001 15:32:38 GMT

Hi Kevin,

Just go the TKB(knowledge base) and look for the Doc ID UPERFKBAN00000726 "Introduction to Performance Tuning for HP-UX"

-Regards
Ramesh

Re: K class CPU performance

linuxfan — Thu, 27 Sep 2001 15:34:57 GMT

Hi Kevin,

Since you are looking for performance documents, here are few more

HP-UX Performance cookbook
http://devresource.hp.com/devresource/Docs/TechPapers/UXPerfCookBook.pdf

GLance
http://devresource.hp.com/devresource/Docs/TechPapers/UsingGlance.pdf

Measureware
http://devresource.hp.com/devresource/Docs/TechPapers/PakPerform.pdf

-HTH
Ramesh

Re: K class CPU performance

James R. Ferguson — Thu, 27 Sep 2001 15:47:14 GMT

Hi Kevin:

If you are logged into the ITRC when you go to the Technical Knowledge Base, you should have access to the aforementioned document (# UPERFKBAN00000726). In any event, for your reading pleasure, I've attached a copy here.

Regards!

...JRF...

Re: K class CPU performance

Sanjay_6 — Thu, 27 Sep 2001 16:42:03 GMT

Hi Kevin,

Other than the thread mentioned by me above which refers to ITRC doc id UPERFKBAN00000726, you can have a look at these documents too, A4460661 and KBRC00000947.

Hope these help.

To access this docs, once you are logged into itrc, select knowledge base and then search for the doc using doc id.

Thanks