Find out CPU core of specific thread at runtime

Question

I am running CC compiler over SUN/Solaris, I have more then 64 threads assigned by the OS to different cores. I am interested to know if there is method to get the core id for different threads during run time?

I am not setting affinity for those threads, i use psrset to create the processor set.

Answer 1

I found the answer: getcpuid() on Solaris returns the core id (even for hyper thread): i have tested it and it works great. http://www.unix.com/man-page/all/3c/getcpuid/

Answer 2

I don't know if there are Solaris-specific system calls for this, but you could use the portable hwloc library and its hwloc_get_last_cpu_location function.