1 //===-- Support/Timer.h - Interval Timing Support ---------------*- C++ -*-===//
3 // This file defines three classes: Timer, TimeRegion, and TimerGroup.
5 // The Timer class is used to track the amount of time spent between invocations
6 // of it's startTimer()/stopTimer() methods. Given appropriate OS support it
7 // can also keep track of the RSS of the program at various points. By default,
8 // the Timer will print the amount of time it has captured to standard error
9 // when the laster timer is destroyed, otherwise it is printed when it's
10 // TimerGroup is destroyed. Timer's do not print their information if they are
13 // The TimeRegion class is used as a helper class to call the startTimer() and
14 // stopTimer() methods of the Timer class. When the object is constructed, it
15 // starts the timer specified as it's argument. When it is destroyed, it stops
16 // the relevant timer. This makes it easy to time a region of code.
18 // The TimerGroup class is used to group together related timers into a single
19 // report that is printed when the TimerGroup is destroyed. It is illegal to
20 // destroy a TimerGroup object before all of the Timers in it are gone. A
21 // TimerGroup can be specified for a newly created timer in its constructor.
23 //===----------------------------------------------------------------------===//
25 #ifndef SUPPORT_TIMER_H
26 #define SUPPORT_TIMER_H
34 double Elapsed; // Wall clock time elapsed in seconds
35 double UserTime; // User time elapsed
36 double SystemTime; // System time elapsed
37 unsigned long MaxRSS; // Maximum resident set size (in bytes)
38 unsigned long RSSTemp; // Temp for calculating maxrss
39 std::string Name; // The name of this time variable
40 bool Started; // Has this time variable ever been started?
41 TimerGroup *TG; // The TimerGroup this Timer is in.
43 Timer(const std::string &N);
44 Timer(const std::string &N, TimerGroup &tg);
45 Timer(const Timer &T);
48 double getProcessTime() const { return UserTime+SystemTime; }
49 double getWallTime() const { return Elapsed; }
50 unsigned long getMaxRSS() const { return MaxRSS; }
51 std::string getName() const { return Name; }
53 const Timer &operator=(const Timer &T) {
55 UserTime = T.UserTime;
56 SystemTime = T.SystemTime;
61 assert (TG == T.TG && "Can only assign timers in the same TimerGroup!");
65 // operator< - Allow sorting...
66 bool operator<(const Timer &T) const {
67 // Primary sort key is User+System time
68 if (UserTime+SystemTime < T.UserTime+T.SystemTime)
70 if (UserTime+SystemTime > T.UserTime+T.SystemTime)
73 // Secondary sort key is Wall Time
74 return Elapsed < T.Elapsed;
76 bool operator>(const Timer &T) const { return T.operator<(*this); }
78 /// startTimer - Start the timer running. Time between calls to
79 /// startTimer/stopTimer is counted by the Timer class. Note that these calls
80 /// must be correctly paired.
84 /// stopTimer - Stop the timer.
88 /// print - Print the current timer to standard error, and reset the "Started"
90 void print(const Timer &Total);
93 friend class TimerGroup;
95 // Copy ctor, initialize with no TG member.
96 Timer(bool, const Timer &T);
98 /// sum - Add the time accumulated in the specified timer into this timer.
100 void sum(const Timer &T);
106 TimeRegion(const TimeRegion &); // DO NOT IMPLEMENT
108 TimeRegion(Timer &t) : T(t) {
119 std::vector<Timer> TimersToPrint;
121 TimerGroup(const std::string &name) : Name(name), NumTimers(0) {}
123 assert(NumTimers == 0 &&
124 "TimerGroup destroyed before all contained timers!");
129 void addTimer() { ++NumTimers; }
131 void addTimerToPrint(const Timer &T) {
132 TimersToPrint.push_back(Timer(true, T));