iping.c
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	#include <mpi.h>
	#include <stdio.h>

	int main(int argc, char * argv[]) {
	int rank;
	int buf[100];

	MPI_Request request;
	MPI_Status status;

	MPI_Init(&argc, &argv);
	MPI_Comm_rank(MPI_COMM_WORLD, &rank);

	if (rank == 0)
	MPI_Isend(buf, 100, MPI_INT, 1, 0, MPI_COMM_WORLD, &request);
	else if (rank == 1)
	MPI_Irecv(buf, 100, MPI_INT, 0, 0, MPI_COMM_WORLD, &request);

	MPI_Wait(&request, &status);
	MPI_Finalize();
	}