topic Re: Kernel Parameters in Operating System - HP-UX

Kernel Parameters

Dimitry Snezhkov — Wed, 05 Jun 2002 13:12:48 GMT

Hello, experts

I am trying to find out the values for certain kernel parameters for our DBAs and
I cannot find some of them .

kmtune or sam does not show the following:

SHMMHI
SEMMSL

Could you point me to the right place where I can find these values.

Thanks in advance.

Dimitry.

Re: Kernel Parameters

Tom Geudens — Wed, 05 Jun 2002 13:18:50 GMT

Hi,
I always use
http://h21007.www2.hp.com/dspp/files/unprotected/devresource/Docs/TechPapers/UXPerfCookBook.pdf
as a starting point ...

Hope it helps,
Tom

Re: Kernel Parameters

Sanjay_6 — Wed, 05 Jun 2002 13:23:24 GMT

Hi Dimitry,

There are no such kernel (SHMMHI SEMMSL) parameters in 11.0 . Which version of hp-ux are you talking about. Are you sure about these kernel parameters.

http://docs.hp.com//hpux/onlinedocs/os/KCparams.OverviewAll.html

Hope this helps.

Regds

Re: Kernel Parameters

Steve Steel — Wed, 05 Jun 2002 13:23:33 GMT

Hi

kmtune like this should work

kmtune -l -q semmsl
Parameter: semmsl
Current: -
Planned: 2048
Default: 2048
Minimum: -
Module: -
Version: -
Dynamic: No

kmtune -l -q shmmni
Parameter: shmmni
Current: -
Planned: 200
Default: 200
Minimum: -
Module: -
Version: -
Dynamic: No

Steve Steel

Re: Kernel Parameters

Dimitry Snezhkov — Wed, 05 Jun 2002 13:26:49 GMT

This came from Oracle Database
Benchmark With HP PRM Memory Management white paper from 10.27.2000

kmtune -l -q semmsl
does not work

we are running 11.0

Thanks

Re: Kernel Parameters

Giri Sekar. — Wed, 05 Jun 2002 13:29:56 GMT

Hi:

Those are the kernel tunables for semaphores. However they cannot be tuned. Also kmtune will not report that nor SAM. To look into the values go to this file ..

/usr/conf/space.h.d/core-hpux.h

also
/usr/include/sys/sem.h

Thanks
Giri Sekar.

Re: Kernel Parameters

S.K. Chan — Wed, 05 Jun 2002 13:33:51 GMT

Prior to 11i, "semmsl" is a kernel hardcoded value. Check it in /usr/include/sys/sem.h like so ..
# grep SEMMSL /usr/include/sys/sem.h
If you're on 11i, you should be able to see it in SAM and it's dynamic.

The other kernel SHMMHI I never hear of.