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parallel.c
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parallel.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <time.h>
#include <stddef.h>
#include <math.h>
#include <mpi.h>
#ifdef _OPENMP
#include <omp.h>
#endif
#include "convex_hull.c"
bool flag;
void defineStruct(MPI_Datatype *tstype) {
//const int count = 2;
int blocklens[2] = {1,1};
MPI_Datatype types[2] = {MPI_LONG_LONG, MPI_LONG_LONG};
MPI_Aint disps[2] = {offsetof(point,x), offsetof(point,y)};
MPI_Type_create_struct(2, blocklens, disps, types, tstype);
MPI_Type_commit(tstype);
}
int main(int argc, char *argv[]) {
int comm_sz;
int my_rank;
double start_time;
double end_time;
double interval;
char *path = argv[1];
int cloud_size = atoi(argv[2]);
flag = (atoi(argv[3]) == 1) ? true : false;
int n_threads;
if(argv[4]==NULL){
n_threads = 0;
}else{
n_threads = atoi(argv[4]);
printf("n_threads: %d", n_threads);
}
FILE *fptr;
//FILE *fptr_cloud;
char buf[strlen(path)+30];
MPI_Init(NULL, NULL);
MPI_Comm_size(MPI_COMM_WORLD, &comm_sz);
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
//printf("%soutput/output_%d.txt\n", path, my_rank);
snprintf(buf, strlen(path)+30, "%soutput/output_%d.txt", path, my_rank);
//printf("buf: %s", buf);
fptr = fopen(buf,"w");
MPI_Datatype MPI_point;
defineStruct(&MPI_point);
//printf("[BEFORE SCATTER]: RANK: %d\n", my_rank);
int fragment_sz = cloud_size/(comm_sz);
printf("my_rank: %d, fragment_sz: %d\n", my_rank, fragment_sz);
//point *cloud;
point *convex_hull = (point*)malloc(cloud_size * sizeof(point));
point *cloud_fragment = (point*)malloc(fragment_sz * sizeof(point));
cloud_load(cloud_fragment, fragment_sz, path, my_rank);
if(my_rank == 0){
//cloud = (point*)malloc(cloud_size * sizeof(point));
//char buf_cloud[strlen(path)+30];
// snprintf(buf_cloud, strlen(path)+30, "%soutput/output_cloud.txt", path);
// fptr_cloud = fopen(buf_cloud,"w");
//srand(time(NULL));
//cloud_generator(cloud, cloud_size);
//qsort(cloud, cloud_size, sizeof(point), compareX);
//print_cloud(cloud, cloud_size, fptr_cloud);
}
if(my_rank == comm_sz-1){
start_time = MPI_Wtime();
}
//printf("[BEFORE BARRIER]: RANK: %d\n", my_rank);
//MPI_Barrier(MPI_COMM_WORLD);
//MPI_Scatter(cloud, fragment_sz, MPI_point, cloud_fragment, fragment_sz, MPI_point, 0, MPI_COMM_WORLD);
int hull_size;
hull_size = divide(cloud_fragment, fragment_sz, convex_hull, fptr, n_threads);
!flag ? true : fprintf(fptr, "###\n");
int step = (int)log2(comm_sz);
int i;
for(i = 1; i <= step; i++){
//receiver
// 1 - 3 - 5 - 7
// 3 - 7
// 7
if((my_rank+1) % (int)pow(2,i) == 0){
/*
int ready = 43;
if(i > 1){
MPI_Send(&ready, 1, MPI_INT, my_rank-(int)pow(2,i-1), 0, MPI_COMM_WORLD);
}
*/
//convex hull recieved from process #
point convex_hull_rcvd[fragment_sz+1];
//convex hull where to save the result of merging
point convex_hull_merged[fragment_sz*2];
MPI_Recv(convex_hull_rcvd, fragment_sz+1, MPI_point, my_rank-(int)pow(2,i-1), 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
//printf("step: %d receiver: %d from %d\n",i, my_rank, my_rank-(int)pow(2,i-1));
!flag ? true : fprintf(fptr, "START_PROCESS_MERGER\n");
hull_size = merger(convex_hull_rcvd, convex_hull_rcvd[fragment_sz].x, convex_hull, hull_size, convex_hull_merged, fptr, n_threads);
!flag ? true : fprintf(fptr, "###\n");
//save the merged one to the normal one in order to send or merge again in next step
memcpy(convex_hull, convex_hull_merged, hull_size*sizeof(point));
}
//sender
// 0 - 2 - 4 - 6
// 1 - 5
// 3
else{
//Best way I could find to send the actual size in the same message
//Problem is I need to send a much bigger object then hull_size
convex_hull[fragment_sz] = (point){.x = hull_size, .y = 0};
/*
int ready;
if(i > 1){
MPI_Recv(&ready, 1, MPI_INT, my_rank+(int)pow(2,i-1), 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
}
*/
MPI_Send(convex_hull, fragment_sz+1, MPI_point, my_rank+(int)pow(2,i-1), 0, MPI_COMM_WORLD);
//printf("step: %d sender: %d to %d hull of size %lld\n",i, my_rank, my_rank+(int)pow(2,i-1), convex_hull[fragment_sz].x);
if(my_rank==0){
//free(cloud);
}
free(convex_hull);
free(cloud_fragment);
break;
}
fragment_sz *= 2;
}
if(my_rank == comm_sz-1){
/*
FILE *fTime;
char bufTime[strlen(path)+30];
snprintf(bufTime, strlen(path)+30, "%soutput/output_time.txt", path);
fTime = fopen(bufTime, "a");
*/
print_cloud(convex_hull, hull_size, NULL);
end_time = MPI_Wtime();
interval = end_time - start_time;
printf("Finished in time: %lf\n", interval);
//fprintf(fTime, "%lf\n", interval);
}
//printf("[FINAL] My rank: %d\n", my_rank);
MPI_Finalize();
return 0;
}