Determining physical processors on SMT driven architectures

ananth.kandukuri_at_gmail.com
Date: 09/28/05 

Date: 28 Sep 2005 00:26:03 -0700

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