topic Re: High Nice Process in Operating System - HP-UX

High Nice Process

George Nikoloudis_1 — Thu, 06 Dec 2001 20:46:02 GMT

Hello Experts
I have the glance and I monitor the process of the system. What I can see is that 20 % time spent to nice proceses. Also I have a very high IO delay.
I am running Oracle also in a V Class 8 GB and 8 Processors.

Can you Help Please....

Re: High Nice Process

harry d brown jr — Thu, 06 Dec 2001 20:50:34 GMT

Is Oracle using Raw or filesystem ? What kind of Disk-subsystem are you using (emc, va7400, xp512, ...)? What version of OS, and do you have the latest patches (sept 2001) installed?

live free or die
harry

Re: High Nice Process

George Nikoloudis_1 — Thu, 06 Dec 2001 20:52:54 GMT

HPUX 11.00 64bit, Disksubsystem FC10 ,
The patch set is the latest before september, the oracle operates in filesystem

Re: High Nice Process

Sridhar Bhaskarla — Thu, 06 Dec 2001 21:05:42 GMT

Hi George,

This is the amount of time the CPUs are spending doing "nice" work.

Looks like there are some processes running with non-default nice values. Do the following

UNIX95= ps -e -o "nice args" |sort -n

to find out the processes that have non-default nice values (!= 20)

-Sri

Re: High Nice Process

harry d brown jr — Thu, 06 Dec 2001 21:09:45 GMT

I should have asked this in the other post, what is the "high delay" for IO look like?

live free or die
harry

Re: High Nice Process

George Nikoloudis_1 — Thu, 06 Dec 2001 21:13:46 GMT

I did this and I would like to show the result (attachment) there are a lot of such processes. What I can do?

Re: High Nice Process

Sridhar Bhaskarla — Thu, 06 Dec 2001 21:52:44 GMT

No wonder your CPU is working "nice" to your bccs instance.

Looks like the ksh is being spawned with non-default nice priority and the oracle instance inherited this nice value as it might have been started through it.

Looking at the process list, it's hard to determine why the default nice value has been changed for sh/ksh. What will happen if you login again (like telnet to the box) and check the nice value?.
do a simple ps to find out the pid of your
shell and then do

UNIX95= ps -e -o "nice args pid" |grep pid

See if it comes up with a nice value of 20. If so, you may want to bring down bccs database and restart it through this shell.

You can leave it like this if you want bccs instance to be nice to your genesys instance.

-Sri

Re: High Nice Process

George Nikoloudis_1 — Thu, 06 Dec 2001 22:21:46 GMT

What I gat from the ps is:
20 -sh 4202

But it was not the shell I start up the DB. DO you thing that this is a performance issue?

Re: High Nice Process

Sridhar Bhaskarla — Thu, 06 Dec 2001 22:31:07 GMT

The only concern is that the CPU will show more respect to the processes that have the nice value less than that of these processes.
If it is okay for you, you can simple ignore it. For ex., the processes of genesys will be give more preference than the processes of bccs.

-Sri

Re: High Nice Process

George Nikoloudis_1 — Thu, 06 Dec 2001 22:45:27 GMT

Thanks A Lot

Re: High Nice Process

steven Burgess_2 — Thu, 06 Dec 2001 22:54:59 GMT

George

Why have you not assigned any points to any of your replies ?