topic Re: Differentiating between Core and CPU in Operating System - HP-UX

Differentiating between Core and CPU

Vineet Deshpande — Thu, 14 May 2009 11:55:05 GMT

Hi,

I am interested in identifying a core from a physical CPU in HP-UX.

Is there a command which will give me this information?

Will the STM utility give me that information?

Thanks,

Vineet

Re: Differentiating between Core and CPU

Jozef_Novak — Thu, 14 May 2009 11:59:16 GMT

Hello,

STM is not the way to find this out. Each computing core is presented as a processor to the system I/O tree. So if you have a dual core CPU, you will see two instances of "processor" class.

J.

Re: Differentiating between Core and CPU

Pete Randall — Thu, 14 May 2009 12:04:18 GMT

ioscan also identifies each individual core as a processor:

# ioscan |grep proc
120 processor Processor
121 processor Processor
122 processor Processor
123 processor Processor

Pete

Re: Differentiating between Core and CPU

Paul Cross_1 — Thu, 14 May 2009 12:19:56 GMT

For IA64 machines:

machinfo will show:
processor family:
31 for single core
32 for dual core

PS: 11.31 doesn't seem to show this info though

Re: Differentiating between Core and CPU

Vineet Deshpande — Thu, 14 May 2009 12:24:56 GMT

So there is no way to differentiate? No way we can identify a core from an actual cpu ?

Thanks,

Vineet

Re: Differentiating between Core and CPU

Jozef_Novak — Thu, 14 May 2009 12:28:44 GMT

I would say that the way the system assigns CPU ids depends on a server model.

e.g. it will be different for cell based systems when compared to lower-end servers.

J.

Re: Differentiating between Core and CPU

Vineet Deshpande — Thu, 14 May 2009 12:40:25 GMT

Is there any core-id or anything like this which will help us identify a core? In Solaris and Linux there is such a core-id present so I was wondering if there is something like that in HP UX ...

Thanks,

Vineet

Re: Differentiating between Core and CPU

Patrick Wallek — Thu, 14 May 2009 12:47:04 GMT

I just looked at 'xstm' on my rp4440. I currently have 2 x dual core procs in that server.

In looking at the "Information log" for the procs, the "Slot number" distinguishes which cpu cores belong each physical chip.

Two cores have a slot number of 0 and the other 2 cores have a slot number of 2.

Re: Differentiating between Core and CPU

Laurent Menase — Thu, 14 May 2009 12:51:43 GMT

on 11.31 just compile this:
#include
main()
{
printf("cpus = %d\n",mpctl(MPC_GETNUMSPUS,0,0));
printf("cores = %d\n",mpctl(MPC_GETNUMCORES_SYS,0,0));
printf("socket = %d\n",mpctl(MPC_GETNUMSOCKETS_SYS,0,0));
}

Re: Differentiating between Core and CPU

Vineet Deshpande — Thu, 14 May 2009 13:06:02 GMT

Hi Laurent,

Is there any way to get this information through any command ?

Thanks,

Vineet

Re: Differentiating between Core and CPU

Patrick Wallek — Thu, 14 May 2009 13:28:18 GMT

The command below uses cstm to get the slot number for each "cpu" (in this case CPU core).

This command is from an rp4440 with 2 x dual core CPUs.
# echo "selclass qualifier cpu ; info ; wait ; infolog" | cstm | grep "Slot Number"
Slot Number: 0 Software Capability: 0x100000f0
Slot Number: 0 Software Capability: 0x100000f0
Slot Number: 2 Software Capability: 0x100000f0
Slot Number: 2 Software Capability: 0x100000f0

Re: Differentiating between Core and CPU

Laurent Menase — Thu, 14 May 2009 13:35:51 GMT

I don't know I always use that small program
you can embed it in a script if you want.

you can compile it with the base C compiler

Re: Differentiating between Core and CPU

Jestin John Chacko — Thu, 14 May 2009 17:38:38 GMT

Dear,

please check this thread

http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1334412

may be you will get some idea for this issue.