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

Kernel optimization

Pocius Arturas — Fri, 08 Feb 2002 11:31:46 GMT

I wonder what steps would be usefull/necessary to tune OS resources usage (RAM) when using L1000 HPUX11.00 as Oracle8i server. Is it worth to build kernel without some support (eg.FibreChannel,NFS/9000 subsystems if we're not using such at this time).
And what Oracle (32-bit or 64-bit) is better to use on 64-bit OS with 1GB RAM.

Thanks

Re: Kernel optimization

Ravi_8 — Fri, 08 Feb 2002 11:43:44 GMT

Hi,

since you are using as an oracle server, other than kernel parameters(shared memory, semaphores, ..)don't change anything.whatever comes default with the HP system is sufficient.
In my case both 32 bit and 64 bit version works well.

Re: Kernel optimization

Peter Kloetgen — Fri, 08 Feb 2002 11:45:58 GMT

Hi Arturas,

for the reason that a whole HP-UX- 11- kernel is only up to 20 MB, in my opinion it makes no sense to design a new kernel to save perhaps a few MB on a system with a Gig RAM. Another reason not to change the kernel is that you would have to reboot your system now and in the future ( if you need one of the deleted subsystems.... )and this makes no sense.

Allways stay on the bright side of life!

Peter

Re: Kernel optimization

Pocius Arturas — Fri, 08 Feb 2002 13:00:27 GMT

The other side of the question:
What advantages v. disadvantages I would get using 64-bit versus 32-bit Oracle in the system with limited RAM?

Thank you in advance

Re: Kernel optimization

Krishna Prasad — Fri, 08 Feb 2002 14:16:49 GMT

Well there may be other parms that are needed. You need to make sure nfiles,maxusers,maxuprc, maxsize_64bit,maxdsize_64bit are big enough to support your Oracle environment.

For specific to memory a very import parm is dbc_max_pct. I have mine set between 8 - 10. I have heard others have this up to 15. This is the % of buffer_cache the system will use of physicall memory.

And also go to 64bit now. If you every upgrade the memory and system grows you will be glad you are at 64bit for Oracle.

Re: Kernel optimization

Manohar Manne_1 — Fri, 08 Feb 2002 15:17:41 GMT

Use ORacle 64 Bit beacuse 32 bit has shared memroy limitition only 1.7GB SGA available for 32 bit applications in default global window.