View source for Setting Up MPI on Aurora at Smith

--[[User:Thiebaut|D. Thiebaut]] ([[User talk:Thiebaut|talk]]) 21:18, 4 March 2017 (EST)
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This page presents the few steps required to setup MPI on a student account on Aurora.
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=Setting up Bash as Default and Adding MPI to Path=
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* Login to your 352 account
* Using emacs, add these three lines at the end of your .login file:
 
 if (-x /bin/bash) then
    exec /bin/bash -l
 endif 
 
* Using emacs, add the following lines at the end of your .bash_profile file:
  
 PATH=/Users/classes/352b/bin/mpi/bin:$PATH:$HOME/bin
 
* When done, logout and log back in.
* Verify that MPI is now in the path and ready to run:
 
 mpicc -v
 
: You should get a long output of information Using built-in specs.
 
 COLLECT_GCC=/usr/bin/gcc
 COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
 Target: x86_64-linux-gnu
 Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.4-2ubuntu1~14.04.1'  
 ...
  --target=x86_64-linux-gnu
 Thread model: posix
 gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.1) 
 
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=Testing=
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* Using emacs, create this simple C program:
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::<source lang="C">
/* C Example */
#include <stdio.h>
#include <mpi.h>


int main (argc, argv)
     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;
}

</source>
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* Compile and run the program for 2 Processors:
 
 mpicc helloWorld.c -o hello
 mpirun -np 2 ./hello
 
* You should get this output:
 
 Hello world from process 0 of 2
 Hello world from process 1 of 2
 
* If you get this output, you're all set!
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[[Category:MPI]][[Category:CSC352]]