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
|
#include "mpi.h"
#define BUFSIZE 100000
main(int argc, char **argv)
{
int myid, nnodes, size;
double start_time, end_time, elapsed_time;
char buffer[BUFSIZE];
MPI_Request request;
MPI_Status status;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &myid);
MPI_Comm_size(MPI_COMM_WORLD, &nnodes);
printf("node %d of %d checking in\n", myid, nnodes);
for (size = 1; size < BUFSIZE; size*=2) {
if (myid == 0) {
printf("size = %d\n", size);
printf("node 0 sending mpi_isend\n");
MPI_Isend(buffer, size, MPI_BYTE, 1, 0, MPI_COMM_WORLD, &request);
printf("node 0 sent mpi_isend. waiting\n");
MPI_Wait(&request, &status);
printf("node 0 finished waiting\n");
} else if (myid == 1) {
printf("node 1 receiving\n");
MPI_Recv(buffer, size, MPI_BYTE, MPI_ANY_SOURCE, 0, MPI_COMM_WORLD, &statu
s);
printf("node 1 received\n");
}
MPI_Barrier(MPI_COMM_WORLD);
}
exit(0);
}
|
