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bpo-40192: Use thread_cputime for time.thread_time to improve resolution (GH-19381)

Browse source 
On AIX, time.thread_time() is now implemented with thread_cputime()
which has nanosecond resolution, rather than
clock_gettime(CLOCK_THREAD_CPUTIME_ID) which has a resolution of 10 ms.
This commit is contained in:
Batuhan Taskaya 2020-05-16 12:39:09 +03:00 committed by GitHub
parent 62972d9d73
commit 4541086232
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8
Doc/whatsnew/3.9.rst
View file

@ -480,6 +480,14 @@ The :mod:`socket` module now exports the :data:`~socket.CAN_RAW_JOIN_FILTERS`
constant on Linux 4.1 and greater.
(Contributed by Stefan Tatschner and Zackery Spytz in :issue:`25780`.)
time
----
On AIX, :func:`~time.thread_time` is now implemented with ``thread_cputime()``
which has nanosecond resolution, rather than
``clock_gettime(CLOCK_THREAD_CPUTIME_ID)`` which has a resolution of 10 ms.
(Contributed by Batuhan Taskaya in :issue:`40192`)
sys
---

4
Misc/NEWS.d/next/Library/2020-04-05-04-16-14.bpo-40192.nk8uRJ.rst Normal file
View file

@ -0,0 +1,4 @@
On AIX, :func:`~time.thread_time` is now implemented with ``thread_cputime()``
which has nanosecond resolution, rather than
``clock_gettime(CLOCK_THREAD_CPUTIME_ID)`` which has a resolution of 10 ms.
Patch by Batuhan Taskaya.

28
Modules/timemodule.c
View file

@ -24,6 +24,10 @@
# include <pthread.h>
#endif
#if defined(_AIX)
# include <sys/thread.h>
#endif
#if defined(__WATCOMC__) && !defined(__QNX__)
# include <i86.h>
#else
@ -1343,6 +1347,30 @@ _PyTime_GetThreadTimeWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)
return 0;
}
#elif defined(_AIX)
#define HAVE_THREAD_TIME
static int
_PyTime_GetThreadTimeWithInfo(_PyTime_t *tp, _Py_clock_info_t *info)
{
/* bpo-40192: On AIX, thread_cputime() is preferred: it has nanosecond
resolution, whereas clock_gettime(CLOCK_THREAD_CPUTIME_ID)
has a resolution of 10 ms. */
thread_cputime_t tc;
if (thread_cputime(-1, &tc) != 0) {
PyErr_SetFromErrno(PyExc_OSError);
return -1;
}
if (info) {
info->implementation = "thread_cputime()";
info->monotonic = 1;
info->adjustable = 0;
info->resolution = 1e-9;
}
*tp = _PyTime_FromNanoseconds(tc.stime + tc.utime);
return 0;
}
#elif defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_PROCESS_CPUTIME_ID)
#define HAVE_THREAD_TIME
static int