Now measures the elapsed time more precisely with gettimeofday.

diff --git a/mtp.cc b/mtp.cc
index 36f09f1..61dcc21 100644 (file)
--- a/mtp.cc
+++ b/mtp.cc
@@ -24,13 +24,20 @@
 
 #include <iostream>
 #include <fstream>
+#include <sys/time.h>
 
 using namespace std;
 
 #include "mtp_tracker.h"
 
+scalar_t diff_in_second(struct timeval *start, struct timeval *end) {
+  return
+    scalar_t(end->tv_sec - start->tv_sec) +
+    scalar_t(end->tv_usec - start->tv_usec)/1000000;
+}
+
 int main(int argc, char **argv) {
-  time_t start_time, end_time;
+  timeval start_time, end_time;
 
   if(argc < 2) {
     cerr << argv[0] << " <tracker file>" << endl;
@@ -47,16 +54,16 @@ int main(int argc, char **argv) {
     tracker->read(in_tracker);
 
     cout << "Building the graph ... "; cout.flush();
-    start_time = time(0);
+    gettimeofday(&start_time, 0);
     tracker->build_graph();
-    end_time = time(0);
-    cout << "done (" << end_time - start_time << "s)." << endl;
+    gettimeofday(&end_time, 0);
+    cout << "done (" << diff_in_second(&start_time, &end_time) << "s)." << endl;
 
     cout << "Tracking ... "; cout.flush();
-    start_time = time(0);
+    gettimeofday(&start_time, 0);
     tracker->track();
-    end_time = time(0);
-    cout << "done (" << end_time - start_time << "s)." << endl;
+    gettimeofday(&end_time, 0);
+    cout << "done (" << diff_in_second(&start_time, &end_time) << "s)." << endl;
 
     ofstream out_traj("result.trj");
     tracker->write_trajectories(&out_traj);