How to output the result on the screen?

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  Hello,

  You can just use c/c++ printf to output to the screen. Note that With MSMPI, the stdout/error from the mpi programs are redirected to mpiexec console. So all the output from each rank will be displayed at mpiexec console. Taking the following simple helloworld mpi app as an example:

  #include <stdio.h>
  #include "mpi.h"
  int main( int argc, char *argv[] )
  {
    int rank;
    MPI_Init( &argc, &argv );
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    printf( "Hello World from Rank %d\n", rank);
    MPI_Finalize();
    return 0;
  }
  

  
  After compile it, you can execute with the command line:

  mpiexec -n 4 HelloWorld.exe

  Hello World from Rank 3
  Hello World from Rank 1
  Hello World from Rank 2
  Hello World from Rank 0

   

  Thanks,

  James

  • Marked as answer by Don PatteeModerator Wednesday, January 12, 2011 3:01 AM

  Thursday, December 16, 2010 9:28 PM