Re: [OMPI users] Is there a MPI routine that returns the value of "npernode" being used?

Ernesto, Not directly. But you can use MPI_Comm_split_type(..., MPI_COMM_TYPE_SHARED, ...) and then MPI_Comm_size(...) on the "returned" communicator. Cheers, Gilles On Sun, Apr 3, 2022 at 5:52 AM Ernesto Prudencio via users < users@lists.open-mpi.org> wrote: > Thanks, > > > > Ernesto. > > Sc

[OMPI users] Is there a MPI routine that returns the value of "npernode" being used?

Thanks, Ernesto. Schlumberger-Private

Re: [OMPI users] 101 question on MPI_Bcast()

Ernesto, MPI_Bcast() has no barrier semantic. It means the root rank can return after the message is sent (kind of eager send) and before it is received by other ranks. Cheers, Gilles On Sat, Apr 2, 2022, 09:33 Ernesto Prudencio via users < users@lists.open-mpi.org> wrote: > I have an “extrem

Re: [OMPI users] 101 question on MPI_Bcast()

Hi Ernesto, You program is erroneous from MPI standard perspective. That means you are in anything can happen land. MPI implementations are typically optimized for performance and assume correct MPI usage from the application. In your situation, especially with small message size (?), the broadc