cpuTime.C
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1 /*---------------------------------------------------------------------------*\
2  ========= |
3  \\ / F ield | OpenFOAM: The Open Source CFD Toolbox
4  \\ / O peration |
5  \\ / A nd | Copyright (C) 2011 OpenFOAM Foundation
6  \\/ M anipulation |
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24 \*---------------------------------------------------------------------------*/
25 
26 #include "cpuTime.H"
27 #include <unistd.h>
28 
29 // * * * * * * * * * * * * * * * Static Members * * * * * * * * * * * * * * //
30 
31 const long Foam::cpuTime::Hz_(sysconf(_SC_CLK_TCK));
32 
33 
34 // * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
35 
36 void Foam::cpuTime::getTime(timeType& t)
37 {
38  times(&t);
39 }
40 
41 
42 double Foam::cpuTime::timeDifference(const timeType& beg, const timeType& end)
43 {
44  return
45  (
46  double
47  (
48  (end.tms_utime + end.tms_stime)
49  - (beg.tms_utime + beg.tms_stime)
50  )/Hz_
51  );
52 }
53 
54 
55 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
56 
58 {
59  getTime(startTime_);
60  lastTime_ = startTime_;
61  newTime_ = startTime_;
62 }
63 
64 
65 // * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
66 
68 {
69  getTime(newTime_);
70  return timeDifference(startTime_, newTime_);
71 }
72 
73 
75 {
76  lastTime_ = newTime_;
77  getTime(newTime_);
78  return timeDifference(lastTime_, newTime_);
79 }
80 
81 
82 // ************************************************************************* //
double cpuTimeIncrement() const
Return CPU time (in seconds) since last call to cpuTimeIncrement()
Definition: cpuTime.C:74
cpuTime()
Construct with the current clock time.
Definition: cpuTime.C:57
double elapsedCpuTime() const
Return CPU time (in seconds) from the start.
Definition: cpuTime.C:67