Hi,
Is there programatical any way of caliculating physical CPUs on IBM
SMT driven archtitural machines.

I am aware of commands of sort "lsdev -C -c processor" and "smtctl".
But is there any API to do same thing. I saw "processor_info" strucutre
in "/usr/include/sys/iplcb.h" contains information i am looking for. Is
there a way to access this.

Linux on IntelHT, stores this info in "/proc/cpuinfo" file. Similarly
AIX stores this info in "/dev/pmem" file. In KDB, "ipl" subcommand
actually parses file "/dev/pmem" to access "processor_info" strctures.
Can i simulate these KDB commands in a programatical fashion.

Atleast, are there "CPUID" sort of assembly instructions in AIX, so
that i can probe for actual number of CPUs.

Any help is appreciated.

Thanks
-Ananth

ananth.kandukuri@gmail.com wrote:
> Hi,
> Is there programatical any way of caliculating physical CPUs on IBM
> SMT driven archtitural machines.
>
> I am aware of commands of sort "lsdev -C -c processor" and "smtctl".
> But is there any API to do same thing. I saw "processor_info" strucutre
> in "/usr/include/sys/iplcb.h" contains information i am looking for. Is
> there a way to access this.
>
> Linux on IntelHT, stores this info in "/proc/cpuinfo" file. Similarly
> AIX stores this info in "/dev/pmem" file. In KDB, "ipl" subcommand
> actually parses file "/dev/pmem" to access "processor_info" strctures.
> Can i simulate these KDB commands in a programatical fashion.
>
> Atleast, are there "CPUID" sort of assembly instructions in AIX, so
> that i can probe for actual number of CPUs.
>
> Any help is appreciated.
>
> Thanks
> -Ananth
>

Have you looked in /proc (on the AIX system)? You might be surprised :-}

Paul

If kdb has the output that you are wanting, why not use that...?


# kdb << END
ipl
END
#

Ananth - see below

sysconf Subroutine

The sysconf subroutine returns a number of processors using the
following parameters:

* _SC_NPROCESSORS_CONF: Number of processors configured
* _SC_NPROCESSORS_ONLN: Number of processors online

For more information, see sysconf Subroutine in AIX 5L Version 5.2
Technical Reference: Base Operating System and Extensions Volume 2.

sergeyt.17@gmail.com wrote:
> sysconf Subroutine

lpar_get_info() on 5.3 ML03 or greater will also be useful.