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Overview
| Comment: | unix: monotonic time (performance counter/wide-clicks) - implements several fallbacks for platforms without monotonic time (older Darwin, MacOSX or xcode) |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | sebres-8-5-event-perf-branch |
| Files: | files | file ages | folders |
| SHA3-256: |
6593536677b62f7d12e157a8727c3e65 |
| User & Date: | sebres 2019-03-08 15:38:05 |
Context
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2019-03-09
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| 18:41 | TclpScaleUTime fixed typo, only if native scaling used (tclScaleTimeProcPtr == NativeScaleTime) the ... check-in: fca5fb3444 user: sebres tags: sebres-8-5-event-perf-branch | |
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2019-03-08
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| 15:39 | merge 8-5-event-perf-branch (no monotonic time fallbacks) check-in: ec9b47d045 user: sebres tags: sebres-8-6-event-perf-branch | |
| 15:38 | unix: monotonic time (performance counter/wide-clicks) - implements several fallbacks for platforms ... check-in: 6593536677 user: sebres tags: sebres-8-5-event-perf-branch | |
| 04:38 | merge 8.5 (fixed performance test for short exec-time) check-in: 177092d5da user: sebres tags: sebres-8-5-event-perf-branch | |
Changes
Changes to unix/tclUnixTime.c.
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*
*----------------------------------------------------------------------
*/
Tcl_WideInt
TclpGetUTimeMonotonic(void)
{
struct timespec mntv;
if ( tclGetTimeProcPtr == NativeGetTime
&& clock_gettime(CLOCK_MONOTONIC, &mntv) == 0
) {
/* monotonic time since some starting point in microseconds */
return ((Tcl_WideInt)mntv.tv_sec)*1000000 + mntv.tv_nsec / 1000;
} else {
/* fallback via tclGetTimeProcPtr */
Tcl_Time time;
tclGetTimeProcPtr(&time, tclTimeClientData);
return ((Tcl_WideInt)time.sec)*1000000 + time.usec;
}
}
................................................................................
Tcl_WideInt
TclpGetWideClicks(void)
{
Tcl_WideInt now;
if (tclGetTimeProcPtr == NativeGetTime) {
#ifndef MAC_OSX_TCL
/* 1 wide click == 0.001 microseconds (1 nanosecond) */
struct timespec mntv;
(void)clock_gettime(CLOCK_MONOTONIC, &mntv);
return ((Tcl_WideInt)mntv.tv_sec)*1000000*1000 + mntv.tv_nsec;
#else /* MAC_OSX_TCL: */
/* 1 wide click == (tb.numer / tb.denom / 1000) microseconds */
return (Tcl_WideInt) (mach_absolute_time() & INT64_MAX);
#endif
} else {
/* 1 wide click == 1 microsecond (1000 nanoseconds) */
Tcl_Time time;
(*tclGetTimeProcPtr) (&time, tclTimeClientData);
now = ((Tcl_WideInt)time.sec)*1000000 + time.usec;
................................................................................
double
TclpWideClicksToNanoseconds(
Tcl_WideInt clicks)
{
double nsec;
if (tclGetTimeProcPtr == NativeGetTime) {
#ifndef MAC_OSX_TCL
/* 1 wide click == 0.001 microseconds (1 nanosecond) */
return clicks;
#else /* MAC_OSX_TCL: */
/* 1 wide click == (tb.numer / tb.denom) nanoseconds */
static mach_timebase_info_data_t tb;
static uint64_t maxClicksForUInt64;
if (!tb.denom) {
mach_timebase_info(&tb);
maxClicksForUInt64 = UINT64_MAX / tb.numer;
}
if ((uint64_t) clicks < maxClicksForUInt64) {
nsec = ((uint64_t) clicks) * tb.numer / tb.denom;
} else {
nsec = ((long double) (uint64_t) clicks) * tb.numer / tb.denom;
}
#endif
} else {
/* 1 wide click == 1 microsecond (1000 nanoseconds) */
nsec = clicks * 1000;
}
return nsec;
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*
*----------------------------------------------------------------------
*/
Tcl_WideInt
TclpGetUTimeMonotonic(void)
{
if (tclGetTimeProcPtr == NativeGetTime) {
#if defined(CLOCK_MONOTONIC)
/* monotonic time available on this platform */
struct timespec mntv;
if (clock_gettime(CLOCK_MONOTONIC, &mntv) != 0) {
/* fallback to non-monotonic real-time. */
return TclpGetMicroseconds();
}
/* monotonic time since some starting point in microseconds */
return ((Tcl_WideInt)mntv.tv_sec)*1000000 + mntv.tv_nsec / 1000;
#elif defined(MAC_OSX_TCL)
/* absolute time related (tb.numer / tb.denom / 1000) microseconds */
static mach_timebase_info_data_t tb;
static uint64_t maxClicksForUInt64;
uint64_t clicks = mach_absolute_time();
if (!tb.denom) {
mach_timebase_info(&tb);
maxClicksForUInt64 = UINT64_MAX / tb.numer;
}
if ((uint64_t) clicks < maxClicksForUInt64) {
return (Tcl_WideInt)(((uint64_t) clicks) * tb.numer / 1000 / tb.denom);
} else {
return (Tcl_WideInt)(((uint64_t) clicks) / 1000 * tb.numer / tb.denom);
}
#else /* no MAC_OSX_TCL and no monotonic time (xcode etc) */
/* fallback to non-monotonic real-time (microseconds) */
return TclpGetMicroseconds();
/*
* TODO: may be the seconds could be obtained over the uptime (since last boot),
* like here (https://stackoverflow.com/questions/20817311/ios-real-monotonic-clock-other-than-mach-absolute-time):
int mib[2] = {CTL_KERN, KERN_BOOTTIME};
size_t size = sizeof(boottime);
time_t now;
time_t uptime = -1;
(void)time(&now);
if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 && boottime.tv_sec != 0)
{
uptime = now - (boottime.tv_sec);
}
* but I don't think this could provide even micro- or milliseconds granularity,
* so a not back-drifting (monotonic) mix-in would be necessary.
*/
#endif
} else {
Tcl_Time time;
tclGetTimeProcPtr(&time, tclTimeClientData);
return ((Tcl_WideInt)time.sec)*1000000 + time.usec;
}
}
................................................................................
Tcl_WideInt
TclpGetWideClicks(void)
{
Tcl_WideInt now;
if (tclGetTimeProcPtr == NativeGetTime) {
#if defined(CLOCK_MONOTONIC)
/* 1 wide click == 0.001 microseconds (1 nanosecond) */
struct timespec mntv;
(void)clock_gettime(CLOCK_MONOTONIC, &mntv);
return ((Tcl_WideInt)mntv.tv_sec)*1000000*1000 + mntv.tv_nsec;
#elif defined(MAC_OSX_TCL)
/* 1 wide click == (tb.numer / tb.denom / 1000) microseconds */
return (Tcl_WideInt) (mach_absolute_time() & INT64_MAX);
#else /* no MAC_OSX_TCL and no monotonic time (xcode etc) */
/* 1 wide click == 1 microsecond (1000 nanoseconds) */
return TclpGetMicroseconds();
#endif
} else {
/* 1 wide click == 1 microsecond (1000 nanoseconds) */
Tcl_Time time;
(*tclGetTimeProcPtr) (&time, tclTimeClientData);
now = ((Tcl_WideInt)time.sec)*1000000 + time.usec;
................................................................................
double
TclpWideClicksToNanoseconds(
Tcl_WideInt clicks)
{
double nsec;
if (tclGetTimeProcPtr == NativeGetTime) {
#if defined(CLOCK_MONOTONIC)
/* 1 wide click == 0.001 microseconds (1 nanosecond) */
return clicks;
#elif defined(MAC_OSX_TCL)
/* 1 wide click == (tb.numer / tb.denom) nanoseconds */
static mach_timebase_info_data_t tb;
static uint64_t maxClicksForUInt64;
if (!tb.denom) {
mach_timebase_info(&tb);
maxClicksForUInt64 = UINT64_MAX / tb.numer;
}
if ((uint64_t) clicks < maxClicksForUInt64) {
nsec = ((uint64_t) clicks) * tb.numer / tb.denom;
} else {
nsec = ((long double) (uint64_t) clicks) * tb.numer / tb.denom;
}
#else /* no MAC_OSX_TCL and no monotonic time (xcode etc) */
/* 1 wide click == 1 microsecond (1000 nanoseconds) */
return clicks * 1000;
#endif
} else {
/* 1 wide click == 1 microsecond (1000 nanoseconds) */
nsec = clicks * 1000;
}
return nsec;
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