Re: [Boost-users] mpi non-blocking communication

(1) You must initialize MPI with MPI_Init_thread() instead of  MPI_Init().  The boost::mpi::communicator ctor uses MPI_Init(), so you  must run the initialization yourself and *then* create the  communicator object.  For instance::        MPI_Init_thread(&argc, &argv, MPI_THREAD_SERIALIZED)        // ...        mpi::communicator world; 

Riccardo, I have the following code in my main: int main(int argc, char* argv[]) { boost::mpi::environment env(argc, argv); const int mpi_thread_support = MPI::Init_thread(argc, argv, MPI_THREAD_SERIALIZED ); if (mpi_thread_support != MPI_THREAD_SERIALIZED) { std::cerr<< "MPI implementation does not support threads" <