Using MPICH2 on your computer

• Create MPI config file. Create the file ~/.mpd.conf and enter one line that contains a secret code word. The commands to do this are shown below. Remember to put your own secret word in your file.

  touch ~/.mpd.conf
  echo "MPD_secretword=abracadabara" > ~/.mpd.conf
  chmod 600 ~/.mpd.conf
  

• Setting up MPICH2. Assume that you installed MPICH2 in the folder
  /usr/local/mpich2 on your computer. Then add the following at the end of your ~/.bashrc file and source it with the command source ~/.bashrc (or log in again).

  #----------------------------------------------------------------------
  # MPICH2 setup
  export PATH=/usr/local/mpich2/bin:$PATH
  export MANPATH=/usr/local/mpich2/man:$MANPATH
  #----------------------------------------------------------------------
  

• Running a MPI program
  • Run your mpi program with the mpiexec command.

    mpiexec -n 4 hello_world