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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"
/*
static char MTEST_Descrip[] = "Test MPI_Exscan (simple test)";
*/
int main(int argc, char *argv[])
{
int errs = 0;
int rank, size;
int sendbuf[1], recvbuf[1];
MPI_Comm comm;
MTest_Init(&argc, &argv);
comm = MPI_COMM_WORLD;
MPI_Comm_rank(comm, &rank);
MPI_Comm_size(comm, &size);
sendbuf[0] = rank;
recvbuf[0] = -2;
MPI_Exscan(sendbuf, recvbuf, 1, MPI_INT, MPI_SUM, comm);
/* Check the results. rank 0 has no data. Input is
* 0 1 2 3 4 5 6 7 8 ...
* Output is
* - 0 1 3 6 10 15 21 28 36
* (scan, not counting the contribution from the calling process)
*/
if (rank > 0) {
int result = (((rank) * (rank - 1)) / 2);
/* printf("%d: %d\n", rank, result); */
if (recvbuf[0] != result) {
errs++;
fprintf(stderr, "Error in recvbuf = %d on %d, expected %d\n", recvbuf[0], rank, result);
}
} else if (recvbuf[0] != -2) {
errs++;
fprintf(stderr, "Error in recvbuf on zero, is %d\n", recvbuf[0]);
}
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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