Context Navigation

BcastReduce.c

main

Last change on this file was ea777aa, checked in by Alex Wilton <awilton@…>, 3 years ago

Moved examples, include, build_default.properties, common.xml, and README out from dev.civl.com into the root of the repo.

git-svn-id: svn://vsl.cis.udel.edu/civl/trunk@5704 fb995dde-84ed-4084-dfe6-e5aef3e2452c

File size: 651 bytes

Rev	Line
[5d951df]	1	/* This example show how to collectively call MPI collective
	2	functions. They must be called by every included process in a same
	3	order. */
[ec2d23f2]	4	#include <mpi.h>
	5	#include <assert.h>
	6
	7	int main(int argc, char * argv[]) {
	8	int nprocs, rank;
	9	int num;
	10	int recv;
	11
	12	MPI_Init(&argc, &argv);
	13	MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
	14	MPI_Comm_rank(MPI_COMM_WORLD, &rank);
	15	if(rank == 0) num = 3;
	16	MPI_Bcast(&num, 1, MPI_INT, 0, MPI_COMM_WORLD);
	17	MPI_Reduce(&num, &recv, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
	18	if(rank == 0) num = recv;
	19	MPI_Bcast(&num, 1, MPI_INT, 0, MPI_COMM_WORLD);
	20	assert(num == 3 * nprocs);
	21	MPI_Finalize();
	22	return 0;
	23	}

Note: See TracBrowser for help on using the repository browser.