1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
/*
* This program checks if MPICH can correctly handle a huge message
* receive when the sender underflows by sending a much smaller
* message
*/
#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <mpi.h>
#include "mpitest.h"
#define HUGE_SIZE (10*1024*1024)
int main(int argc, char *argv[])
{
int size, rank;
int dest;
char *buff;
MTest_Init(&argc, &argv);
buff = malloc(HUGE_SIZE);
buff[0] = 0;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
dest = size - 1;
/* Try testing underflow to make sure things work if we try to send 1 byte
* when receiving a huge message */
if (rank == 0) {
MPI_Send(buff, 1, MPI_BYTE, dest, 0, MPI_COMM_WORLD);
} else if (rank == dest) {
MPI_Recv(buff, HUGE_SIZE, MPI_BYTE, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
}
free(buff);
MPI_Barrier(MPI_COMM_WORLD);
MTest_Finalize(0);
return 0;
}
|
