include stdio include stdlib include mpi int main int argc char argv i

#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>

int main(int argc, char** argv)
{
	int size, rank;
	MPI_Status stat;
	MPI_Init(&argc,&argv);
	MPI_Comm_size(MPI_COMM_WORLD,&size);
	MPI_Comm_rank(MPI_COMM_WORLD,&rank);

	int root;
	root = 0; 

	int r = 0;
	srand(time(NULL)); 

	if (rank == 0)
		r = rand();

	printf("Rank: %d; val: %d\n", rank, r);
	
	MPI_Barrier(MPI_COMM_WORLD);
	double t1 =MPI_Wtime();
	if (rank == root)
	{
		int i;
		for (i = 0; i < size; i++)
			if (i != root)
				MPI_Send(&r, 1, MPI_INT, i, 0, MPI_COMM_WORLD);
	}
	else
	{
		MPI_Recv(&r, 1, MPI_INT, root, MPI_ANY_TAG, MPI_COMM_WORLD, &stat);
	}

	printf("\n");
	MPI_Barrier(MPI_COMM_WORLD);
	double t2 = MPI_Wtime();

	printf("Rank: %d; val: %d\n", rank, r);

	MPI_Barrier(MPI_COMM_WORLD);
	
	if (rank == 0)
		printf("Потрачено: %f\n", t2 - t1);

	MPI_Finalize();
	
	return 0;
}


#include <stdio.h>
#include <stdlib.h>
#include <mpi.h>

int main(int argc, char** argv)
{
	int size, rank;
	MPI_Status stat;
	MPI_Init(&argc,&argv);
	MPI_Comm_size(MPI_COMM_WORLD,&size);
	MPI_Comm_rank(MPI_COMM_WORLD,&rank);

	int root;
	root = 0; 

	int r = 0;
	srand(time(NULL)); 

	if (rank == 0)
		r = rand();

	printf("Rank: %d; val: %d\n", rank, r);
	MPI_Barrier(MPI_COMM_WORLD);
	double t1 = MPI_Wtime();
	MPI_Bcast(&r, 1, MPI_INT, 0, MPI_COMM_WORLD);
	double t2 = MPI_Wtime();

	printf("\n");
	MPI_Barrier(MPI_COMM_WORLD);
	printf("Rank: %d; val: %d\n", rank, r);

	MPI_Barrier(MPI_COMM_WORLD);
	
	if (rank == 0)
		printf("Потрачено: %f\n", t2 - t1);

	MPI_Finalize();
	
	return 0;
}