Getting Started - 1.65.1 - Boost C++ Libraries

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MPI Implementation

To get started with Boost.MPI, you will first need a working MPI implementation. There are many conforming MPI implementations available. Boost.MPI should work with any of the implementations, although it has only been tested extensively with:

  • Open MPI
  • MPICH2
  • Intel MPI

You can test your implementation using the following simple program, which passes a message from one processor to another. Each processor prints a message to standard output.

#include <mpi.h> #include <iostream> int main(int argc, char* argv[]) { MPI_Init(&argc, &argv); int rank; MPI_Comm_rank(MPI_COMM_WORLD, &rank); if (rank == 0) { int value = 17; int result = MPI_Send(&value, 1, MPI_INT, 1, 0, MPI_COMM_WORLD); if (result == MPI_SUCCESS) std::cout << "Rank 0 OK!" << std::endl; } else if (rank == 1) { int value; int result = MPI_Recv(&value, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE); if (result == MPI_SUCCESS && value == 17) std::cout << "Rank 1 OK!" << std::endl; } MPI_Finalize(); return 0; }

You should compile and run this program on two processors. To do this, consult the documentation for your MPI implementation. With OpenMPI, for instance, you compile with the mpiCC or mpic++ compiler, boot the LAM/MPI daemon, and run your program via mpirun. For instance, if your program is called mpi-test.cpp, use the following commands:

mpiCC -o mpi-test mpi-test.cpp lamboot mpirun -np 2 ./mpi-test lamhalt

When you run this program, you will see both Rank 0 OK! and Rank 1 OK! printed to the screen. However, they may be printed in any order and may even overlap each other. The following output is perfectly legitimate for this MPI program:

Rank Rank 1 OK! 0 OK!

If your output looks something like the above, your MPI implementation appears to be working with a C++ compiler and we're ready to move on.

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