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41 | #include <mpi.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(int argc, char *argv[])
{
MPI_Init(&argc, &argv);
int my_rank = -1;
int process_count = -1;
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
MPI_Comm_size(MPI_COMM_WORLD, &process_count);
char hostname[MPI_MAX_PROCESSOR_NAME];
int hostname_length = -1;
MPI_Get_processor_name(hostname, &hostname_length);
srand( my_rank + time(NULL) );
long my_lucky_number = rand() % 100;
printf("Process %d: my lucky number is %ld\n", my_rank, my_lucky_number);
long all_min = -1;
long all_sum = -1;
long all_max = -1;
MPI_Reduce(&my_lucky_number, &all_min, /*count*/ 1, MPI_LONG, MPI_MIN, /*root*/ 0, MPI_COMM_WORLD);
MPI_Reduce(&my_lucky_number, &all_sum, /*count*/ 1, MPI_LONG, MPI_SUM, /*root*/ 0, MPI_COMM_WORLD);
MPI_Reduce(&my_lucky_number, &all_max, /*count*/ 1, MPI_LONG, MPI_MAX, /*root*/ 0, MPI_COMM_WORLD);
if ( my_rank == 0 )
{
printf("Process %d: all minimum: %02ld\n", my_rank, all_min);
printf("Process %d: all average: %.2lf\n", my_rank, (double)all_sum / process_count);
printf("Process %d: all maximum: %02ld\n", my_rank, all_max);
}
MPI_Finalize();
return 0;
}
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