Mastering C++ Multithreading

Using MPI

Regardless of the implementation chosen, the resulting API will always match the official MPI standard, differing only by the MPI version that the library one has picked supports. All MPI-1 (revision 1.3) features should be supported by any MPI implementation, however.

This means that the canonical Hello World (as, for example, found on the MPI Tutorial site: http://mpitutorial.com/tutorials/mpi-hello-world/) for MPI should work regardless of which library one picks:

 #include <mpi.h> #include <stdio.h> int main(int argc, char** argv) { // Initialize the MPI environment MPI_Init(NULL, NULL); // Get the number of processes int world_size; MPI_Comm_size(MPI_COMM_WORLD, &world_size); // Get the rank of the process int world_rank; MPI_Comm_rank(MPI_COMM_WORLD, ...