Added measurements

main.cpp

@@ -2,7 +2,9 @@
 #include "forces.hpp"
 #include "math.h"
 #include "pedestrian.hpp"
+#include "tsc_x86.h"
 #include "vector2d.hpp"
+#include <iostream>
 
 #define BOARD_WIDTH 10.0
 #define BOARD_LENGTH 50.0
@@ -50,6 +52,11 @@ int main(int argc, const char *argv[]) {
   int n_p = atoi(argv[1]);
   int n_iter = atoi(argv[2]);
   Pedestrian *pedestrians = init_pedestrians(n_p);
+
+  // # Start here or right after function signature
+  uint64_t start = start_tsc();
+
+  // # (8 + 55N - 55 + 144 + 4 + 8 + 4 + 10)*n_p*n_iter
   for (int t = 0; t < n_iter; t++) {
 
     for (int i = 0; i < n_p; i++) {
@@ -58,21 +65,44 @@ int main(int argc, const char *argv[]) {
 
       p.f_i.reset();
 
+      // # 8 flops
       compute_acceleration_term(&p);
 
+      // # 55N - 55 flops
       compute_repulsive_effects_from_pedestrians(pedestrians, &p, n_p);
 
+      // # 144 flops
       compute_repulsive_effects_from_borders(board, &p);
 
+      // # 4 flops = 2 ADDs, 2 MULTs
       Vector2d w_alpha = p.curr_vel + p.f_i * dt;
 
+      // # 8 flops = 2 MULTs, 2 DIVs, 1 SQRT, 2 MULTs, 1 ADD
       p.curr_vel = w_alpha * g(p.v_max, w_alpha.norm());
 
+      // # 4 flops = 2 ADDs, 2 MULTs
       p.curr_pos = p.curr_pos + p.curr_vel * dt;
 
+      // # 10 flops = 5 ADDs, 2 DIVs, 1 SQRT, 2 MULTs
       p.e = (p.destination - p.curr_pos) / (p.destination - p.curr_pos).norm();
     }
   }
+  int W = (8 + 55 * n_p - 55 + 144 + 4 + 8 + 4 + 10) * n_p * n_iter;
+  std::cout << "W(n): ";
+  std::cout << W;
+  std::cout << " flops\n";
+  
+  double T = stop_tsc(start);
+  std::cout << "T(n): ";
+  std::cout << T;
+  std::cout << " cycles\n";
 
+  double P = W/T;
+
+  std::cout << "P(n): ";
+  std::cout << P;
+  std::cout << " flops/cycle\n";
+
+  delete []pedestrians;
   return 0;
 }