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gh-108753: Enhance pystats (#108754)

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Statistics gathering is now off by default. Use the "-X pystats"
command line option or set the new PYTHONSTATS environment variable
to 1 to turn statistics gathering on at Python startup.

Statistics are no longer dumped at exit if statistics gathering was
off or statistics have been cleared.

Changes:

* Add PYTHONSTATS environment variable.
* sys._stats_dump() now returns False if statistics are not dumped
  because they are all equal to zero.
* Add PyConfig._pystats member.
* Add tests on sys functions and on setting PyConfig._pystats to 1.
* Add Include/cpython/pystats.h and Include/internal/pycore_pystats.h
  header files.
* Rename '_py_stats' variable to '_Py_stats'.
* Exclude Include/cpython/pystats.h from the Py_LIMITED_API.
* Move pystats.h include from object.h to Python.h.
* Add _Py_StatsOn() and _Py_StatsOff() functions. Remove
  '_py_stats_struct' variable from the API: make it static in
  specialize.c.
* Document API in Include/pystats.h and Include/cpython/pystats.h.
* Complete pystats documentation in Doc/using/configure.rst.
* Don't write "all zeros" stats: if _stats_off() and _stats_clear()
  or _stats_dump() were called.
* _PyEval_Fini() now always call _Py_PrintSpecializationStats() which
  does nothing if stats are all zeros.

Co-authored-by: Michael Droettboom <mdboom@gmail.com>
This commit is contained in:
Victor Stinner 2023-09-06 17:54:59 +02:00 • committed by GitHub
parent 8ff1142578
commit a0773b89df
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19 changed files with 403 additions and 184 deletions
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10
Modules/gcmodule.c
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@ -1200,8 +1200,8 @@ gc_collect_main(PyThreadState *tstate, int generation,
{
GC_STAT_ADD(generation, collections, 1);
#ifdef Py_STATS
if (_py_stats) {
_py_stats->object_stats.object_visits = 0;
if (_Py_stats) {
_Py_stats->object_stats.object_visits = 0;
}
#endif
int i;
@ -1362,10 +1362,10 @@ gc_collect_main(PyThreadState *tstate, int generation,
GC_STAT_ADD(generation, objects_collected, m);
#ifdef Py_STATS
if (_py_stats) {
if (_Py_stats) {
GC_STAT_ADD(generation, object_visits,
_py_stats->object_stats.object_visits);
_py_stats->object_stats.object_visits = 0;
_Py_stats->object_stats.object_visits);
_Py_stats->object_stats.object_visits = 0;
}
#endif