Setting up the environment
Associated code:
INTEGER W_RANK, W_SIZE, ERRCODE
. . .
CALL MPI_INIT(ERRCODE)
CALL MPI_COMM_SIZE(MPI_COMM_WORLD, W_RANK, ERRCODE)
CALL MPI_COMM_RANK(MPI_COMM_WORLD, W_RANK, ERRCODE)
. . .
CALL MPI_FINALIZE(ERRCODE)
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