[Python-checkins] bpo-40192: Use thread_cputime for time.thread_time to improve resolution (GH-19381)
Batuhan Taskaya
webhook-mailer at python.org
Sat May 16 05:39:13 EDT 2020
https://github.com/python/cpython/commit/45410862321ae509e8753f239b0ea28fdcef5bad
commit: 45410862321ae509e8753f239b0ea28fdcef5bad
branch: master
author: Batuhan Taskaya <isidentical at gmail.com>
committer: GitHub <noreply at github.com>
date: 2020-05-16T11:39:09+02:00
summary:
bpo-40192: Use thread_cputime for time.thread_time to improve resolution (GH-19381)
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.
files:
A Misc/NEWS.d/next/Library/2020-04-05-04-16-14.bpo-40192.nk8uRJ.rst
M Doc/whatsnew/3.9.rst
M Modules/timemodule.c
diff --git a/Doc/whatsnew/3.9.rst b/Doc/whatsnew/3.9.rst
index c721a167440c3..cbddbb4f3f962 100644
--- a/Doc/whatsnew/3.9.rst
+++ b/Doc/whatsnew/3.9.rst
@@ -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
---
diff --git a/Misc/NEWS.d/next/Library/2020-04-05-04-16-14.bpo-40192.nk8uRJ.rst b/Misc/NEWS.d/next/Library/2020-04-05-04-16-14.bpo-40192.nk8uRJ.rst
new file mode 100644
index 0000000000000..e1e7fcefe3f94
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-04-05-04-16-14.bpo-40192.nk8uRJ.rst
@@ -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.
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index a0e66ac170b21..8a4d149befb52 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -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
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