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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include <stdio.h>
#include <stdlib.h>
#include "mpi.h"
#include "mpitest.h"
/*
* This test makes sure that each process can send to each other process.
* If there are bugs in the handling of request completions or in
* queue operations, then this test may fail on them (it did with
* early EagerShort handling).
*/
#define MAXPES 32
#define MYBUFSIZE 16*1024
static int buffer[MAXPES][MYBUFSIZE];
#define NUM_RUNS 10
int main(int argc, char *argv[])
{
int i;
int count, size;
int self, npes;
double secs;
MPI_Request request[MAXPES];
MPI_Status status;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &self);
MPI_Comm_size(MPI_COMM_WORLD, &npes);
if (npes > MAXPES) {
fprintf(stderr, "This program requires a comm_world no larger than %d", MAXPES);
MPI_Abort(MPI_COMM_WORLD, 1);
}
for (size = 1; size <= MYBUFSIZE; size += size) {
secs = -MPI_Wtime();
for (count = 0; count < NUM_RUNS; count++) {
MPI_Barrier(MPI_COMM_WORLD);
for (i = 0; i < npes; i++) {
if (i != self)
MPI_Irecv(buffer[i], size, MPI_INT, i,
MPI_ANY_TAG, MPI_COMM_WORLD, &request[i]);
}
for (i = 0; i < npes; i++) {
if (i != self)
MPI_Send(buffer[self], size, MPI_INT, i, 0, MPI_COMM_WORLD);
}
for (i = 0; i < npes; i++) {
if (i != self)
MPI_Wait(&request[i], &status);
}
}
MPI_Barrier(MPI_COMM_WORLD);
secs += MPI_Wtime();
if (self == 0) {
secs = secs / (double) NUM_RUNS;
MTestPrintfMsg(1, "length = %d ints\n", size);
}
}
/* Simple completion is all that we normally ask of this program */
MTest_Finalize(0);
return 0;
}
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