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Make clock_gettime() faster on FreeBSD

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This commit is contained in:
Justine Tunney 2022-06-11 00:05:06 -07:00
parent 5deda43766
commit 5ea618f0af
15 changed files with 67 additions and 18 deletions
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2
libc/calls/kclocknames.S
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@ -32,7 +32,9 @@
.underrun
kClockNames:
.e CLOCK_REALTIME,"REALTIME"
.e CLOCK_REALTIME_FAST,"REALTIME_FAST"
.e CLOCK_MONOTONIC,"MONOTONIC"
.e CLOCK_MONOTONIC_FAST,"MONOTONIC_FAST"
.e CLOCK_MONOTONIC_RAW,"MONOTONIC_RAW"
.e CLOCK_REALTIME_COARSE,"REALTIME_COARSE"
.e CLOCK_MONOTONIC_COARSE,"MONOTONIC_COARSE"

4
libc/calls/now.c
View file

@ -44,10 +44,10 @@ static long double GetTimeSample(void) {
uint64_t tick1, tick2;
long double time1, time2;
sched_yield();
time1 = dtime(CLOCK_REALTIME);
time1 = dtime(CLOCK_MONOTONIC_FAST);
tick1 = rdtsc();
nanosleep(&(struct timespec){0, 1000000}, NULL);
time2 = dtime(CLOCK_REALTIME);
time2 = dtime(CLOCK_MONOTONIC_FAST);
tick2 = rdtsc();
return (time2 - time1) * 1e9 / MAX(1, tick2 - tick1);
}

4
libc/calls/oldbench.c
View file

@ -40,10 +40,10 @@ static long double GetTimeSample(void) {
uint64_t tick1, tick2;
long double time1, time2;
sched_yield();
time1 = dtime(CLOCK_REALTIME);
time1 = dtime(CLOCK_MONOTONIC);
tick1 = rdtsc();
nanosleep(&(struct timespec){0, 1000000}, NULL);
time2 = dtime(CLOCK_REALTIME);
time2 = dtime(CLOCK_MONOTONIC);
tick2 = rdtsc();
return (time2 - time1) * 1e9 / MAX(1, tick2 - tick1);
}