topic Re: C Programming question in Operating System - HP-UX

C Programming question

S.T.Arun — Tue, 06 Aug 2002 11:08:03 GMT

Hi,
I want my (user) process to be attached to a specific processor in a multiprocessor system (4 CPUs). If I have 3 processes (p1, p2, p3) and CPUs (c1, c2, c3, c4), I want process p1 to run only on c1, p2 on c2 etc.

Is this possible? Any kind of pointers will help me. Thank you in advance.

Arun.

Re: C Programming question

T G Manikandan — Tue, 06 Aug 2002 11:30:18 GMT

To my knowledge I don't think you can attach a process to a specific processor.

There are some openview tools from hp which can allocate some amount of % usage of CPU to a process or user.

The tool is the Process Resource Manager.

Just find some information at
http://docs.hp.com/hpux/onlinedocs/B8733-90007/B8733-90007.html

Thanks

Re: C Programming question

Stefan Farrelly — Tue, 06 Aug 2002 11:31:21 GMT

see manpage for;

pthread_processor_bind_np(3T) pthread_processor_bind_np(3T)
Pthread Library

NAME
pthread_num_processors_np(), pthread_processor_bind_np(),
pthread_processor_id_np() - determine how many processors are
installed in the system, bind threads to processors, and determine
processor IDs; respectively.

Re: C Programming question

David Johns — Tue, 06 Aug 2002 12:06:17 GMT

Hi:

Some code was posted a while back that may do what you want:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xdcbb3a7b3682d611abdb0090277a778c,00.html

If the link doesn't work, search the forums on 11i mpctl.

-Dave

Re: C Programming question

Bill McNAMARA_1 — Tue, 06 Aug 2002 12:21:00 GMT

yea, you'll need this patch + dependencies for 11i:

http://support4.itrc.hp.com/service/patch/patchDetail.do?patchid=PHKL_24578&context=hpux:800:11:11

Later,
Bill

Re: C Programming question

Steven Gillard_2 — Tue, 06 Aug 2002 13:39:43 GMT

You can also do this non-programmatically on 11i using the mpsched(1) command:

$ mpsched -c1 ./p1

This will bind the p1 command to SPU 1. Remember the SPU numbers start at 0.

See the man page for more info.

Regards,
Steve