If MKL libraries are linked to an MPI program by using the MKL link flag i.e. -mkl=cluster, then whether the problem size of mkl routine is divided between mpi processes alone? or between mpi processes as well as OpenMP threads also?
If you use -mkl=cluster, it will be linking to cluster mkl lib, MPI version and wouldn't be using hybrid.
If you want hybrid parallelism, link the libs individually, and our MKL linkline advisor will give you the exact link line that you would want to use.