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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 |
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 15:38:05.516 |
Context
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 | |
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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135 136 137 138 139 140 141 | * *---------------------------------------------------------------------- */ Tcl_WideInt TclpGetUTimeMonotonic(void) { | > > > | < | < > > > > > > > > > > > > > > > | > > | > > > > > > > > > > > > > > > > > > > > > | 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | * *---------------------------------------------------------------------- */ 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; } } |
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202 203 204 205 206 207 208 | Tcl_WideInt TclpGetWideClicks(void) { Tcl_WideInt now; if (tclGetTimeProcPtr == NativeGetTime) { | | | | > > > | 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 | 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; |
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247 248 249 250 251 252 253 | double TclpWideClicksToNanoseconds( Tcl_WideInt clicks) { double nsec; if (tclGetTimeProcPtr == NativeGetTime) { | | | > > > | 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 | 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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