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/* -*- C -*-
*
* $HEADER$
*
* The most basic of MPI applications
*/
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include "mpi.h"
int main(int argc, char* argv[])
{
int rank, size;
MPI_Info info, srch;
char port[MPI_MAX_PORT_NAME];
bool local=false;
if (1 < argc) {
if (0 == strcmp("local", argv[1])) {
local = true;
}
}
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
printf("Hello, World, I am %d of %d\n", rank, size);
MPI_Info_create(&info);
if (local) {
MPI_Info_set(info, "ompi_global_scope", "false");
} else {
MPI_Info_set(info, "ompi_global_scope", "true");
}
if (0 == rank) {
MPI_Open_port(MPI_INFO_NULL, port);
MPI_Publish_name("pubsub-test", info, port);
printf("Rank %d published port %s\n", rank, port);
}
MPI_Barrier(MPI_COMM_WORLD);
MPI_Info_create(&srch);
MPI_Info_set(srch, "ompi_lookup_order", "local,global");
if (rank != 0) {
MPI_Lookup_name("pubsub-test", srch, port);
printf("Rank %d got port %s\n", rank, port);
}
MPI_Barrier(MPI_COMM_WORLD);
if (0 == rank) {
MPI_Unpublish_name("pubsub-test", info, port);
}
MPI_Info_free(&info);
MPI_Info_free(&srch);
MPI_Finalize();
return 0;
}
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