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TestStopWatchMain.cpp
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41 
45 
46 int main(int argc, char* argv[])
47 {
48 
49  using std::cout;
50  using std::endl;
52 
53  bool success = true;
54 
55  Teuchos::GlobalMPISession mpiSession(&argc,&argv);
56 
57  try {
58 
59  stopwatch timer;
60 
61  // Finding min resolution.
62  double min_resolution = 0.0; // in seconds
63  int total_num_calls = 0;
64  {
65  cout << "\n*** Measuring miminum resolution.\n";
66  timer.start();
67  double last_time = timer.read();
68  const int max_num_samples = 20;
69  int num_samples = 0;
70  int num_calls = 0;
71  while( num_samples < max_num_samples ) {
72  double time = timer.read();
73  num_calls++;
74  if( time - last_time > 0.0 ) {
75  cout << "time_diff = " << time - last_time
76  << ", num_calls = " << num_calls << endl;
77  min_resolution += time - last_time;
78  ++total_num_calls;
79  last_time = time;
80  num_calls = 0;
81  num_samples++;
82  }
83  }
84  min_resolution /= total_num_calls;
85  }
86 
87  std::cerr << "Minimum stopwatch resolution = " << min_resolution << " sec\n";
88 
89  // Finding increasing resolution.
90  {
91  cout << "\n*** Measuring increasing resolution.\n";
92  timer.start();
93  double start_time = timer.read(), last_time = start_time;
94  const int max_num_samples = 20;
95  int num_samples = 0;
96  int num_calls = 0;
97  while( num_samples < max_num_samples ) {
98  double time = timer.read();
99  num_calls++;
100  if( time - last_time > 0.0 ) {
101  cout << "time = " << time - start_time
102  << ", num_calls = " << num_calls << endl;
103  last_time = time;
104  num_calls = 0;
105  num_samples++;
106  }
107  }
108  }
109 
110  } // end try
111  TEUCHOS_STANDARD_CATCH_STATEMENTS(true, std::cerr, success);
112 
113  if(success)
114  cout << "\nEnd Result: TEST PASSED" << std::endl;
115 
116  return 0;
117 
118 }
Simple stopwatch object.
#define TEUCHOS_STANDARD_CATCH_STATEMENTS(VERBOSE, ERR_STREAM, SUCCESS_FLAG)
int main(int argc, char *argv[])