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Merge pull request #839 from terrelln/timer 

[bench] Use higher resolution timer on POSIX
dev
Yann Collet 2017-09-12 17:13:52 -07:00 committed by GitHub
parent 4120a7fd5a 6ab4d5e904
commit 5bbb465d3e
1 changed files with 61 additions and 26 deletions
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49
programs/util.h
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@ -133,13 +133,48 @@ static int g_utilDisplayLevel;
UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_freq_t rate, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return (((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom))/1000ULL; }
UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_freq_t rate, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return ((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom); }
#elif (PLATFORM_POSIX_VERSION >= 200112L)
#include <sys/times.h> /* times */
typedef U64 UTIL_freq_t;
typedef U64 UTIL_time_t;
UTIL_STATIC void UTIL_initTimer(UTIL_freq_t* ticksPerSecond) { *ticksPerSecond=sysconf(_SC_CLK_TCK); }
UTIL_STATIC void UTIL_getTime(UTIL_time_t* x) { struct tms junk; clock_t newTicks = (clock_t) times(&junk); (void)junk; *x = (UTIL_time_t)newTicks; }
UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_freq_t ticksPerSecond, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000ULL * (clockEnd - clockStart) / ticksPerSecond; }
UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_freq_t ticksPerSecond, UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000000ULL * (clockEnd - clockStart) / ticksPerSecond; }
#include <time.h>
typedef struct timespec UTIL_freq_t;
typedef struct timespec UTIL_time_t;
UTIL_STATIC void UTIL_initTimer(UTIL_freq_t* res)
{
if (clock_getres(CLOCK_MONOTONIC, res))
UTIL_DISPLAYLEVEL(1, "ERROR: Failed to init clock\n");
}
UTIL_STATIC void UTIL_getTime(UTIL_time_t* time)
{
if (clock_gettime(CLOCK_MONOTONIC, time))
UTIL_DISPLAYLEVEL(1, "ERROR: Failed to get time\n");
}
UTIL_STATIC UTIL_time_t UTIL_getSpanTime(UTIL_freq_t res, UTIL_time_t begin, UTIL_time_t end)
{
UTIL_time_t diff;
(void)res;
if (end.tv_nsec < begin.tv_nsec) {
diff.tv_sec = (end.tv_sec - 1) - begin.tv_sec;
diff.tv_nsec = (end.tv_nsec + 1000000000ULL) - begin.tv_nsec;
} else {
diff.tv_sec = end.tv_sec - begin.tv_sec;
diff.tv_nsec = end.tv_nsec - begin.tv_nsec;
}
return diff;
}
UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_freq_t res, UTIL_time_t begin, UTIL_time_t end)
{
UTIL_time_t const diff = UTIL_getSpanTime(res, begin, end);
U64 micro = 0;
micro += 1000000ULL * diff.tv_sec;
micro += diff.tv_nsec / 1000ULL;
return micro;
}
UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_freq_t res, UTIL_time_t begin, UTIL_time_t end)
{
UTIL_time_t const diff = UTIL_getSpanTime(res, begin, end);
U64 nano = 0;
nano += 1000000000ULL * diff.tv_sec;
nano += diff.tv_nsec;
return nano;
}
#else /* relies on standard C (note : clock_t measurements can be wrong when using multi-threading) */
typedef clock_t UTIL_freq_t;
typedef clock_t UTIL_time_t;