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bpo-41710: gc_collect_main() uses _PyTime_GetPerfCounter() (GH-28676)

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If the DEBUG_STATS debug flag is set, gc_collect_main() now uses
_PyTime_GetPerfCounter() instead of _PyTime_GetMonotonicClock() to
measure the elapsed time.

On Windows, _PyTime_GetMonotonicClock() only has a resolution of 15.6
ms, whereas _PyTime_GetPerfCounter() is closer to a resolution of 100
ns.
This commit is contained in:
Victor Stinner 2021-10-01 13:29:00 +02:00 • committed by GitHub
parent 98d2827002
commit 54957f16a6
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1 changed files with 2 additions and 2 deletions
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Modules/gcmodule.c
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@ -1211,7 +1211,7 @@ gc_collect_main(PyThreadState *tstate, int generation,
if (gcstate->debug & DEBUG_STATS) { if (gcstate->debug & DEBUG_STATS) {
PySys_WriteStderr("gc: collecting generation %d...\n", generation); PySys_WriteStderr("gc: collecting generation %d...\n", generation);
show_stats_each_generations(gcstate); show_stats_each_generations(gcstate);
t1 = _PyTime_GetMonotonicClock(); t1 = _PyTime_GetPerfCounter();
} }
if (PyDTrace_GC_START_ENABLED()) if (PyDTrace_GC_START_ENABLED())
@ -1307,7 +1307,7 @@ gc_collect_main(PyThreadState *tstate, int generation,
debug_cycle("uncollectable", FROM_GC(gc)); debug_cycle("uncollectable", FROM_GC(gc));
} }
if (gcstate->debug & DEBUG_STATS) { if (gcstate->debug & DEBUG_STATS) {
double d = _PyTime_AsSecondsDouble(_PyTime_GetMonotonicClock() - t1); double d = _PyTime_AsSecondsDouble(_PyTime_GetPerfCounter() - t1);
PySys_WriteStderr( PySys_WriteStderr(
"gc: done, %zd unreachable, %zd uncollectable, %.4fs elapsed\n", "gc: done, %zd unreachable, %zd uncollectable, %.4fs elapsed\n",
n+m, n, d); n+m, n, d);