MPI: Difference between revisions

Each MPI program must include the relevant header file (<tt>mpi.h</tt> for C/C++, <tt>mpif.h</tt> for Fortran), and be compiled and linked against the desired MPI implementation. Most MPI implementations provide a handy script, often called a ''compiler wrapper'', that handles all set-up issues with respect to <code>include</code> and <code>lib</code> directories, linking flags, ''etc.'' Our examples will all use these compiler wrappers:

The arguments to the C <code>MPI_Init</code> are pointers to the <code>argc</code> and <code>argv</code> variables that represent the command-line arguments to the program. Like all C MPI functions, the return value represents the error status of the function. Fortran MPI subroutines return the error status in an additional argument, <code>IERR</code>.