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Subject: Re: [OMPI users] MPI_Init() and MPI_Init_thread()
From: Anthony Chan (chan_at_[hidden])
Date: 2010-03-04 11:52:37

----- "Yuanyuan ZHANG" <zhang.yuanyuan_at_[hidden]> wrote:

> 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?

If your MPI calls is NOT within OpenMP directives, MPI does not even
know you are using threads. So calling MPI_Init is good enough.