# MPI+OpenMP Scalability

I have a numerical code which is MPI+OpenMP (hybrid) parallelized and an available computational resource of 32 nodes with 16 cores on each node. The code has been tested for MPI scalability up to 16 cores on different nodes and OpenMP scalability on 16 cores on a single node.

Can I assume the hybrid parallelization to be scalable on $32\times 16$ cores?

Edit: MPI+OpenMP is done in such a way that MPI processes are launched at the beginning itself and shared memory parallelization is done within each process using a few PARALLEL DO loops.

• Do any of the threaded sections of the code also include MPI calls, or are the two logically separated? Apr 28, 2016 at 14:23