Message Passing Interface (MPI)

Hey, this is my repo for some Message Passing Interface code snippets. I'm presently learning about this stuff, and will keep adding new things that I try out.

Installing MPI on Ubuntu

Use the following command on the terminal to install the MPI compiler on Ubuntu:

  sudo apt install lam4-dev 
  OR
  sudo apt install libmpich-dev 

Compiling MPI programs

To compile MPI programs, use the following commnad:

  mpicc foo.c

You can also use the following command to place the output in the file myfoo instead of a.out:

  mpicc -o myfoo foo.c

Running your MPI programs

To run your MPI programs you can either of the follwing commands:

    mpirun -np 2 ./myfoo  

OR

    mpiexec -np 2 ./myfoo  

Here -np specifies how many processses to create. In the above case, 2 processes are created and both run the myfoo
executable.

For more details, please see the man pages of the commands :

  man mpicc

  man mpiexec