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sdl_reduce_lat.c
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sdl_reduce_lat.c
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#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>
#include <mpix_harmonize.h>
#define ARRAY_SIZE 1000000
#define NUM_ITERATIONS 1000 // Replace with the actual number of iterations
int main(int argc, char **argv) {
MPI_Init(&argc, &argv);
int rank, size, flag;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
int *data = (int *)malloc(ARRAY_SIZE * sizeof(int));
for (int i = 0; i < ARRAY_SIZE; ++i) {
data[i] = i + rank * ARRAY_SIZE;
}
// Timing variables
double start_time, end_time, t_sum = 0.0;
int num_valid = 0;
for (int iter = 0; iter < NUM_ITERATIONS; ++iter) {
/* synchronize processes */
//MPI_Barrier(MPI_COMM_WORLD);
MPIX_Harmonize(MPI_COMM_WORLD, &flag);
start_time = MPI_Wtime();
int sum = 0;
// Compute the sum
for (int i = 0; i < ARRAY_SIZE; ++i) {
sum += data[i];
}
// Record the end time
end_time = MPI_Wtime();
/* check whether this experiment is valid */
int flag;
MPI_Allreduce(MPI_IN_PLACE, &flag, 1, MPI_INT, MPI_LAND, MPI_COMM_WORLD);
if (flag) { /* the experiment is valid */
num_valid++;
t_sum += end_time - start_time;
}
}
if (rank == 0) {
printf("MPI_Allreduce: %d valid iterations, %f average latency\n", num_valid, t_sum / num_valid);
}
free(data);
MPI_Finalize();
return 0;
}