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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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Programs/_testembed.c
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@ -708,6 +708,10 @@ static int test_init_from_config(void)
config.pathconfig_warnings = 0;
config.safe_path = 1;
#ifdef Py_STATS
putenv("PYTHONSTATS=");
config._pystats = 1;
#endif
putenv("PYTHONINTMAXSTRDIGITS=6666");
config.int_max_str_digits = 31337;
@ -778,6 +782,9 @@ static void set_most_env_vars(void)
putenv("PYTHONPLATLIBDIR=env_platlibdir");
putenv("PYTHONSAFEPATH=1");
putenv("PYTHONINTMAXSTRDIGITS=4567");
#ifdef Py_STATS
putenv("PYTHONSTATS=1");
#endif
}