Is there any way I can summon nCores with OpenMP?
This seems like a general question about OpenMP, not about the details of the implementation of the Intel Open-Source OpenMP runtime, As such it is off topic for this discussion forum. You would be better reading the fine compiler manual, or asking somewhere like http://stackoverflow.com. (Or look at the OpenMP standard from http://openmp.org, and specifically the OMP_NUM_THREADS envirable).
Ya. I got it sorry about the silly question.
My doubt was that in my mind MPI was responsible for the Cores and OpenMP only threads.
I've already figured out. mb..