+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[]) {
- int rank, size;
- int i;
- int *sendbuf, *recvbuf;
- MPI_Init(&argc, &argv);
- MPI_Comm_rank(MPI_COMM_WORLD, &rank);
- MPI_Comm_size(MPI_COMM_WORLD, &size);
- sendbuf = malloc(sizeof(int) * size);
- recvbuf = malloc(sizeof(int) * size);
- for (i = 0; i < size; i++) {
- sendbuf[i] = 0;
- recvbuf[i] = 0;
- }
- sendbuf[rank] = rank + 1;
- MPI_Reduce(sendbuf, recvbuf, size, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
- if (0 == rank) {
- printf("nodes: ", rank);
- for (i = 0; i < size; i++) {
- printf("%d ", recvbuf[i]);
- }
- printf("\n");
- }
- free(sendbuf);
- free(recvbuf);
- MPI_Finalize();
- return 0;
-}