Added comment

README.md

@@ -25,7 +25,6 @@ When the tools are installed, you need to navigate into a project folder `cd <fo
   * `elementary_cuda`
 * Execute tests with `mpirun -n <nb_tasks> <elementary_seq|mc|opencl|cuda> <height> <width>`
 
-
 ### Game of Life
 
 * Uncomment `#include "../game_of_life/gol.h"` in `dispatch.h`

futhark_mpi/dispatch.c

@@ -213,6 +213,7 @@ static void find_best_factors(int n, int factors[2]) {
             int factor2 = n / i;
             int current_difference = abs(result[0] - result[1]);
             int new_difference = abs(factor1 - factor2);
+            /* The minimum difference will be the most efficient dispatching */
             if (first_pass || current_difference > new_difference) {
                 result[0] = factor1;
                 result[1] = factor2;
@@ -238,6 +239,7 @@ static void find_network_dimensions(struct dispatch_context *dc) {
         if (dc->n_dimensions == 3) {
             int factors[2] = {0};
             find_best_factors(dc->network_dimensions[1], factors);
+            /* We prefer to have more columns than depths */
             if (factors[0] < factors[1]) {
                 dc->network_dimensions[1] = factors[1];
                 dc->network_dimensions[2] = factors[0];