Hi guys, Thanks for your help, but unfortunately I am still not clear.
> You are right Dave, FUNNELED allows the application to have multiple > threads but only the man thread calls MPI. My understanding is that even if I use SINGLE or MPI_Init, I can still have multiple threads if I use OpenMP PARALLEL directive, and only the main thread makes MPI calls. Am I correct? > An OpenMP/MPI hybrid program that makes MPI calls only in between parallel > sections is usually a FUNNELED user of MPI For an OpenMP/MPI hybrid program, if I only want to make MPI calls using the main thread, ie., only in between parallel sections, can I just use SINGLE or MPI_Init? What's the benefit of FUNNELED? Thanks.
