From 88364ea0ff4cd76d30d9e734be9ca269dd61a40a Mon Sep 17 00:00:00 2001
From: ist187691 <miguel.v.barros@tecnico.ulisboa.pt>
Date: Wed, 5 May 2021 20:36:14 +0100
Subject: [PATCH] init MPI

---
 .gitignore        |  1 +
 src/ballAlg-mpi.c | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/.gitignore b/.gitignore
index fc16d51..fedc144 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 *.o
 ballAlg
 ballAlg-omp
+ballAlg-mpi
 ballQuery
 *.zip
 *.tree
diff --git a/src/ballAlg-mpi.c b/src/ballAlg-mpi.c
index c5bf41a..ce95666 100644
--- a/src/ballAlg-mpi.c
+++ b/src/ballAlg-mpi.c
@@ -3,6 +3,7 @@
 #include <omp.h>
 #include <math.h>
 #include <string.h>
+#include <mpi.h>
 #include "gen_points.h"
 #include "point_operations.h"
 #include "ball_tree.h"
@@ -26,6 +27,9 @@ long n_nodes; // number of nodes of the ball tree
 long node_id; // id of the current node of the algorithm
 long node_counter; // number of nodes generated by the program
 
+int rank; //rank of the current process
+int n_procs; //total number of processes
+
 #define LEFT_PARTITION_SIZE(N) ((N) % 2 ? ((N) - 1) / 2 : (N) / 2)
 #define RIGHT_PARTITION_SIZE(N) ((N) % 2 ? ((N) + 1) / 2 : (N) / 2)
 
@@ -189,9 +193,18 @@ void alloc_memory() {
 int main(int argc, char** argv) {
     double exec_time;
     exec_time = -omp_get_wtime();
+
+    MPI_Init (&argc, &argv);
+
+    MPI_Comm_rank (MPI_COMM_WORLD, &rank);
+    MPI_Comm_size (MPI_COMM_WORLD, &n_procs);
+
+    /*
     pts = get_points(argc, argv, &n_dims, &n_points);
     alloc_memory();
     build_tree();
+    */
+
     exec_time += omp_get_wtime();
     fprintf(stderr, "%.1lf\n", exec_time);
     printf("%d %ld\n", n_dims, n_nodes);