R. Necaise | MPIReference / Preliminaries

int MPI_Init( int *argc, char **argv[] )

Initializes the MPI environment. This routine must be the first MPI function called by each process in the virtual computer.

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(:begfnct mpi_finalize:)

int MPI_Finalize()

Terminates the MPI environment and should be called by at the end of the program by every process in the virtual computer. (:endfnct:)

(:begfnct mpi_rank:)

int MPI_Comm_rank( MPI_Comm comm, int *pid )

Used by a process to determine its rank or process id number within a communicator.

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(:begfnct mpi_size:)

int MPI_Comm_size( MPI_Comm comm, int *size )

Used by a process to determine the total number of processes associated with a given communicator.

comm: the communicator to be examined.
size: the number of processes is stored in the integer variable at the given reference.

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(:begfnct mpi_barrier:)

int MPI_Barrier( MPI_Comm comm )

Blocks all processes in the given communicator group until all processes have executed the function call. (:endfnct:)

(:begfnct mpi_wtime:)

double MPI_Wtime()

Returns the elapsed time, in seconds, from some point in the past. (:endfnct:)

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