topic Re: Multi Processor OS in Operating System - HP-UX

Multi Processor OS

Varian — Mon, 08 Sep 2003 03:37:23 GMT

Hi,

We have dual processor Server with HP-UX 11i Installed; It shows processor P0 Active & Processor P1 is Idel .

Can some body will let us know how to activate the second Processor in already installed OS.

Thanks & Regards

Varian Crasto

Re: Multi Processor OS

Tim Adamson_1 — Mon, 08 Sep 2003 03:43:46 GMT

What output shows the processors in that state?

Do you have iCOD installed?

Tim.

Re: Multi Processor OS

Sridhar Bhaskarla — Mon, 08 Sep 2003 03:46:09 GMT

Hi,

It could be misleading if there is no activity on the system. If you have multi-threaded processes, then both the CPUs will be shown as active. Single threaded process will occupy an entire cpu but switch between the CPUs depending on the load.

Is your processor p0 100% active?

-Sri

Re: Multi Processor OS

Varian — Mon, 08 Sep 2003 04:04:59 GMT

While machine is booting it shows two processors one is active & the other one is idel.

Yes my single cpu goes upto 100% utilization, I have check it with sar -u command.

Thnaks & Regards

Varian Crasto.

Re: Multi Processor OS

James Murtagh — Mon, 08 Sep 2003 04:16:56 GMT

Hi,

While the server is booting only the monarch cpu is active until a certain point - called the rendezvous. This is implemented when the kernel enters its main() function.

For sar you need to use the -M option to view the status of all the processor, i.e.

# sar -M 1 1

You can check the processors on the system using :

# ioscan -fnCprocessor

Cheers,

James.

Re: Multi Processor OS

Steven E. Protter — Mon, 08 Sep 2003 04:30:36 GMT

At boot time, you will see a message indicating one processor is idle. That may very well be true at boot.

After boot, the OS is multi processor enabled right out of the box.

If you don't have anything running on your system, and you check with glance or top, you will see no load factor on one of the cpu's.

I suggest you use the script I'm attaching and measure performance for an hour. During that hour you should do something on the system like run X-Windows or install software that requires the CPU's to do something.

You will see both CPU's working away quite happily.

SEP

Re: Multi Processor OS

Tim Adamson_1 — Mon, 08 Sep 2003 04:35:23 GMT

Have to agree with James. Once the system is up, use sar -M and determine if both processors are being used. Alternatively, use glance if you have it installed.

Tim

Re: Multi Processor OS

Varian — Mon, 08 Sep 2003 05:09:24 GMT

Thanks a lot
sar -M works give me the reqiured out put.

Regrads

Varian Crasto