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PHTimer.cc
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1 // $Id: PHTimer.C,v 1.2 2010/12/05 02:30:28 bbannier Exp $
2 
11 #include "PHTimer.h"
12 
13 #include <climits>
14 #include <cmath>
15 #include <cstddef>
16 #include <fstream>
17 #include <stdexcept>
18 
19 //______________________________________________________________________
20 // static members
22 const double PHTimer::_twopower32 = pow(2, 32);
23 
24 //______________________________________________________________________
26 {
27  // Set the default to 2 GHz
28  _frequency = 2e9;
29 
30  // Open the cpuinfo file
31  std::ifstream cpuProcFile(path);
32  if (!cpuProcFile.is_open())
33  throw std::runtime_error(std::string("cpu info. unavailable"));
34  else
35  {
36  // Now parse it looking for the string "cpu MHz"
37  char readLine[1024];
38  std::string searchString("cpu MHz");
39  while ((cpuProcFile.rdstate() & std::ios::failbit) == 0)
40  {
41  // Read into the raw char array and then construct a std::string
42  // (std::string) to do the searching
43  cpuProcFile.getline(readLine, 1024);
44  std::string readLineString(readLine);
45  if (readLineString.find(searchString) != std::string::npos)
46  {
47  // Now look for the :, the clock frequency will follow it
48  size_t semicolonPosition = readLineString.find(':', 0);
49  if (semicolonPosition == std::string::npos) throw std::runtime_error(std::string("wrong format for cpu info file"));
50  std::string frequencyString(readLineString.substr(semicolonPosition + 1));
51 
52  // Make a string stream for the conversion to floating number
53  double freqMHz = 0;
54  std::istringstream frequencySstream(frequencyString);
55 
56  frequencySstream >> freqMHz;
57  _frequency = freqMHz * 1e6;
58  }
59  }
60  }
61 }
62 
63 //______________________________________________________________________
65 {
66  unsigned long diff_high = t0._high - t1._high;
67  unsigned long diff_low;
68  if (t0._low < t1._low)
69  {
70  --diff_high;
71  diff_low = (UINT_MAX - t1._low) + t0._low + 1;
72  }
73  else
74  diff_low = t0._low - t1._low;
75 
76  return (_twopower32 * diff_high + diff_low) * _frequency.period();
77 }
78 
79 //_______________________________________________________
80 void PHTimer::PRINT(std::ostream& os, const std::string& message)
81 {
82  const int max_col = 80;
83  if (!message.size())
84  {
85  os << std::string(max_col, '-') << std::endl;
86  return;
87  }
88  int fill = max_col - message.size() - 2;
89  int pre = static_cast<int>(std::floor(fill / 2.0));
90  int post = fill - pre;
91  os << std::string(pre, '-') << " ";
92  os << message << " ";
93  os << std::string(post, '-') << std::endl;
94 }