[2015] | 1 | // ---------------------------------------------------------------------------
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| 2 | // class PERFTIMER definition
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| 3 | // ---------------------------------------------------------------------------
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| 4 |
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| 5 | #ifndef DUMMY_TIMER
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| 6 |
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| 7 | /** Very accurate Timer class for benchmarking on SGI systems.
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| 8 | This timer can be used to accurately take measurements
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| 9 | on all SGI-systems, usually in the microseconds range.
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| 10 |
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| 11 | Note: getting the time on an unavailable Timer returns garbage.
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| 12 | */
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| 13 | class PERFTIMER
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| 14 | {
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| 15 | private:
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| 16 | static TIMEVAL_T frequency;
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| 17 | static bool isinitialized;
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| 18 | static bool available;
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| 19 |
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| 20 | public: // public for macro versions of Entry/Exit
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| 21 | TIMEVAL_T start_count;
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| 22 | TIMEVAL_T total_count;
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| 23 |
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| 24 |
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| 25 | public:
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| 26 |
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| 27 | // this retrieves the timer frequency - will be called by constructor
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| 28 | // NOTE: allow this to be called externally, so logging can be enabled!
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| 29 | static void InitClass(bool verbose);
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| 30 |
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| 31 |
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| 32 | /// the time type used for Perftimers
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| 33 | typedef double t_time;
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| 34 |
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| 35 | /// returns the frequency
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| 36 | static double GetFrequency(bool verbose = false);
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| 37 |
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| 38 | /// Constructor calls Start
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| 39 | PERFTIMER(bool verbose = false);
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| 40 |
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| 41 | /// use in conjunction with Exit() to time parts of code that are called more than once
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| 42 | void Entry();
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| 43 | /// stop counting but remember total
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| 44 | void Exit();
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| 45 | /// read total time elapsed and reset the time - to be used with Entry()/Exit()
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| 46 | double TotalTime();
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| 47 |
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| 48 | /// reset and start the counter - use for timing one piece of code (implicit Entry())
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| 49 | void Start();
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| 50 | /** returns elapsed time in seconds - if restart is true, timer is also restarted - use with Start()
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| 51 | (implicit Exit()/Entry() with same timestamp, with restart: implicit Exit()/TotalTime()/Entry())
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| 52 | */
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| 53 | double Elapsed(bool restart = true);
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| 54 | /** returns elapsed time in milliseconds - if restart is true, timer is also restarted - use with Start()
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| 55 | (implicit Exit()/Entry() with same timestamp, with restart: implicit Exit()/TotalTime()/Entry())
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| 56 | */
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| 57 | double Elapsedms(bool restart = true);
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| 58 |
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| 59 | // returns elapsed time in cycles - if restart is true, timer is also restarted
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| 60 | //unsigned int ElapsedCycles(bool restart = true);
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| 61 |
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| 62 | /// false if no appropriate hardware found
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| 63 | bool Available();
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| 64 | };
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| 65 |
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| 66 | // ---------------------------------------------------------------------------
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| 67 | // class PERFTIMER inline implementation
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| 68 | // ---------------------------------------------------------------------------
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| 69 |
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| 70 | PERFTIMER_INLINE bool PERFTIMER::Available()
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| 71 | {
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| 72 | /// HACK: no SGI detection!
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| 73 | return available;
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| 74 | }
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| 75 |
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| 76 | // macro version to ensure inlining
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| 77 | #define PERF_ENTRY(perftimer) TIMEVAL_GET((perftimer).start_count);
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| 78 |
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| 79 | PERFTIMER_INLINE void PERFTIMER::Entry()
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| 80 | {
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| 81 | TIMEVAL_GET(start_count);
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| 82 | }
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| 83 |
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| 84 | PERFTIMER_INLINE void PERFTIMER::Start()
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| 85 | {
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| 86 | TIMEVAL_ZERO(total_count);
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| 87 | Entry();
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| 88 | }
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| 89 |
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| 90 | // macro version to ensure inlining
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| 91 | #define PERF_EXIT(perftimer) { TIMEVAL_T end_count; TIMEVAL_GET(end_count); TIMEVAL_ADD((perftimer).total_count, end_count, (perftimer).start_count);}
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| 92 |
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| 93 | PERFTIMER_INLINE void PERFTIMER::Exit()
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| 94 | {
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| 95 | TIMEVAL_T end_count;
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| 96 | TIMEVAL_GET(end_count);
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| 97 | TIMEVAL_ADD(total_count, end_count, start_count);
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| 98 | }
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| 99 |
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| 100 |
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| 101 | PERFTIMER_INLINE double PERFTIMER::TotalTime()
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| 102 | {
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| 103 | double time = TIMEVAL_TODOUBLE(total_count);
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| 104 | TIMEVAL_ZERO(total_count);
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| 105 |
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| 106 | return time;
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| 107 | }
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| 108 |
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| 109 | // returns elapsed time in seconds - if restart is true, timer is also restarted
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| 110 | PERFTIMER_INLINE double PERFTIMER::Elapsed(bool restart)
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| 111 | {
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| 112 | TIMEVAL_T end_count;
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| 113 | TIMEVAL_GET(end_count);
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| 114 | TIMEVAL_ADD(total_count, end_count, start_count);
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| 115 |
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| 116 | TIMEVAL_ASSIGN(start_count, end_count); // unnecessary for entry/exit operation, but doesn't hurt
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| 117 |
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| 118 | double time = TIMEVAL_TODOUBLE(total_count);
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| 119 |
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| 120 | if (restart)
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| 121 | {
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| 122 | TIMEVAL_ZERO(total_count);
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| 123 | }
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| 124 |
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| 125 | return time;
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| 126 | }
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| 127 |
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| 128 | // returns elapsed time in milliseconds - if restart is true, timer is also restarted
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| 129 | PERFTIMER_INLINE double PERFTIMER::Elapsedms(bool restart)
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| 130 | {
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| 131 | TIMEVAL_T end_count;
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| 132 | TIMEVAL_GET(end_count);
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| 133 | TIMEVAL_ADD(total_count, end_count, start_count);
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| 134 |
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| 135 | TIMEVAL_ASSIGN(start_count, end_count); // unnecessary for entry/exit operation, but doesn't hurt
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| 136 |
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| 137 | double time = TIMEVAL_TODOUBLE(total_count);
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| 138 |
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| 139 | if (restart)
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| 140 | {
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| 141 | TIMEVAL_ZERO(total_count);
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| 142 | }
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| 143 |
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| 144 | return time * 1000.;
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| 145 | }
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| 146 |
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| 147 | // Constructor calls Start
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| 148 | PERFTIMER_INLINE PERFTIMER::PERFTIMER(bool verbose)
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| 149 | {
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| 150 | if (!isinitialized)
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| 151 | InitClass(verbose);
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| 152 |
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| 153 | //TIMEVAL_ZERO(total_count);
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| 154 | Start();
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| 155 | }
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| 156 |
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| 157 | #else
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| 158 |
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| 159 | class PERFTIMER
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| 160 | {
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| 161 | public:
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| 162 | PERFTIMER(bool x = false) {}
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| 163 | static double GetFrequency(bool) {return 1;}
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| 164 | void Start() {}
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| 165 | double Elapsed(bool restart = true) { return 0; }
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| 166 | double Elapsedms(bool restart = true) { return 0; }
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| 167 | void Entry() {}
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| 168 | void Exit() {}
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| 169 | double TotalCount() { return 0; }
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| 170 | bool Available() { return false; }
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| 171 | };
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| 172 |
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| 173 | #endif
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