分佈式-在ubuntu12.04上安裝mpi

參考鏈接：http://jetcracker.wordpress.com/2012/03/01/how-to-install-mpi-in-ubuntu/

1. 安裝：

sudo apt-get install libcr-dev mpich2 mpich2-doc

2. 例子：

mpi_hello.c

/* C Example */
#include <mpi.h>
#include <stdio.h>

int main (int argc, char* argv[])
{
  int rank, size;

  MPI_Init (&argc, &argv);      /* starts MPI */
  MPI_Comm_rank (MPI_COMM_WORLD, &rank);        /* get current process id */
  MPI_Comm_size (MPI_COMM_WORLD, &size);        /* get number of processes */
  printf( "Hello world from process %d of %d\n", rank, size );
  MPI_Finalize();
  return 0;
}

3. 編譯以及運行：

mpicc mpi_hello.c -o hello
mpirun -np 2 ./hello