+/*
+ * (C) 2017 by Argonne National Laboratory.
+ * See COPYRIGHT in top-level directory.
+ *
+ * Portions of this code were written by Intel Corporation.
+ * Copyright (C) 2011-2017 Intel Corporation. Intel provides this material
+ * to Argonne National Laboratory subject to Software Grant and Corporate
+ * Contributor License Agreement dated February 8, 2012.
+ *
+ * This program checks if MPICH can correctly handle many outstanding large
+ * message transfers which use wildcard receives.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <memory.h>
+#include <mpi.h>
+
+#define N_TRY 16
+#define BLKSIZE (10*1024*1024)
+
+int main(int argc, char *argv[])
+{
+ int size, rank;
+ int dest;
+ int i;
+ char *buff;
+ MPI_Request reqs[N_TRY];
+
+ MPI_Init(&argc, &argv);
+
+ buff = malloc(N_TRY * BLKSIZE);
+ memset(buff, -1, N_TRY * BLKSIZE);
+
+ MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+ MPI_Comm_size(MPI_COMM_WORLD, &size);
+
+ dest = size - 1;
+
+ if (rank == 0) {
+ for (i = 0; i < N_TRY; i++)
+ MPI_Isend(buff + BLKSIZE*i, BLKSIZE, MPI_BYTE, dest, 0, MPI_COMM_WORLD, &reqs[i]);
+ MPI_Waitall(N_TRY, reqs, MPI_STATUSES_IGNORE);
+ }
+ else if (rank == dest) {
+ for (i = 0; i < N_TRY; i++)
+ MPI_Irecv(buff + BLKSIZE*i, BLKSIZE, MPI_BYTE, MPI_ANY_SOURCE, 0, MPI_COMM_WORLD, &reqs[i]);
+ MPI_Waitall(N_TRY, reqs, MPI_STATUSES_IGNORE);
+ }
+
+ free(buff);
+
+ if (rank == 0)
+ puts(" No Errors");
+
+ MPI_Finalize();
+
+ return 0;
+}