PEP 418: Complete "Precision in Python" column in the different tables
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Victor Stinner
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pep-0418.txt
67
pep-0418.txt
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@ -725,15 +725,15 @@ Examples of clock precision on x86_64:
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========================= ================ ========= ===================
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Name Operating system Precision Precision in Python
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========================= ================ ========= ===================
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CLOCK_MONOTONIC_RAW Linux 3.2 1 ns 3 µs
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CLOCK_HIGHRES SunOS 5.11 2 ns 2 µs
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CLOCK_MONOTONIC Linux 3.2 1 ns 2 µs
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CLOCK_HIGHRES SunOS 5.11 2 ns ?
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CLOCK_MONOTONIC SunOS 5.11 2 ns ?
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QueryPerformanceCounter Windows Seven 10 ns ?
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CLOCK_UPTIME FreeBSD 8.2 11 ns 9 µs
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CLOCK_MONOTONIC SunOS 5.11 2 ns 3 µs
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CLOCK_MONOTONIC_RAW Linux 3.2 1 ns 3 µs
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CLOCK_MONOTONIC FreeBSD 8.2 11 ns 7 µs
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CLOCK_MONOTONIC OpenBSD 5.0 10 ms ?
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GetTickCount Windows Seven 16 ms ?
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CLOCK_MONOTONIC OpenBSD 5.0 10 ms 7 µs
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QueryPerformanceCounter Windows Seven 10 ns 9 µs
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CLOCK_UPTIME FreeBSD 8.2 11 ns 9 µs
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GetTickCount Windows Seven 16 ms 15 ms
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========================= ================ ========= ===================
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For CLOCK_xxx clocks, the precision of this table is the result of
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@ -976,11 +976,11 @@ Examples of clock precision on x86_64:
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========================= ================ ========= ===================
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Name Operating system Precision Precision in Python
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========================= ================ ========= ===================
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CLOCK_REALTIME SunOS 5.11 10 ms 2 µs
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CLOCK_REALTIME Linux 3.2 1 ns 2 µs
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CLOCK_REALTIME FreeBSD 8.2 11 ns 7 µs
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CLOCK_REALTIME SunOS 5.11 10 ms ?
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CLOCK_REALTIME OpenBSD 5.0 10 ms ?
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GetSystemTimeAsFileTime Windows Seven 16 ms ?
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CLOCK_REALTIME OpenBSD 5.0 10 ms 10 µs
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GetSystemTimeAsFileTime Windows Seven 16 ms 1 ms
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========================= ================ ========= ===================
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For CLOCK_REALTIME, the precision of this table is the result of
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@ -1026,15 +1026,15 @@ Process time
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The process time cannot be set. It is not monotonic: the clocks stop
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while the process is idle.
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========================= =============== =============
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Name Resolution Include sleep
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========================= =============== =============
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GetProcessTimes() 100 ns No
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CLOCK_PROCESS_CPUTIME_ID 1 ns No
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getrusage() 1 µs No
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times() \- No
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clock() \- No (*)
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========================= =============== =============
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========================= ========== =============
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Name Resolution Include sleep
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========================= ========== =============
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GetProcessTimes() 100 ns No
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CLOCK_PROCESS_CPUTIME_ID 1 ns No
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getrusage(RUSAGE_SELF) 1 µs No
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times() \- No
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clock() \- No (*)
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========================= ========== =============
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(*) On Windows, clock() does include time elapsed during a sleep. It does not
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on other operating systems.
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@ -1044,15 +1044,18 @@ Examples of clock precision on x86_64:
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========================= ================ ========= ===================
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Name Operating system Precision Precision in Python
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========================= ================ ========= ===================
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getrusage(RUSAGE_SELF) FreeBSD 8.2 \- 1 µs
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CLOCK_PROCESS_CPUTIME_ID Linux 3.2 1 ns 3 µs
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clock() SunOS 5.11 1 µs ?
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getrusage() Linux 3.0 4 ms 4 ms
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getrusage() FreeBSD 8.2 - 1 µs
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getrusage(RUSAGE_SELF) SunOS 5.11 \- 3 µs
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getrusage(RUSAGE_SELF) Linux 3.0 4 ms 4 ms
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getrusage(RUSAGE_SELF) OpenBSD 5.0 \- 8 ms
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clock() FreeBSD 8.2 8 ms 8 ms
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clock() Linux 3.2 1 µs 10 ms
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times() Linux 3.0 10 ms 10 ms
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clock() OpenBSD 5.0 10 ms ?
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GetProcessTimes() Windows Seven 16 ms ?
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clock() OpenBSD 5.0 10 ms 10 ms
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times() OpenBSD 5.0 10 ms 10 ms
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GetProcessTimes() Windows Seven 16 ms 16 ms
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clock() SunOS 5.11 1 µs 10 ms
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========================= ================ ========= ===================
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The precision of clock() in this table is the result of 1 /
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@ -1080,7 +1083,7 @@ Functions
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program.
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* times()
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* getrusage(): ru_utime and ru_stime fields
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* getrusage(RUSAGE_SELF): ru_utime and ru_stime fields
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Python source code includes a portable library to get the process time (CPU
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time): `Tools/pybench/systimes.py
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@ -1093,21 +1096,21 @@ Thread time
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The thread time cannot be set. It is not monotonic: the clocks stop
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while the thread is idle.
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========================= ===============
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========================= ==========
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Name Resolution
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========================= ===============
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GetThreadTimes() 100 ns
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CLOCK_THREAD_CPUTIME_ID 1 ns
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========================= ===============
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========================= ==========
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CLOCK_THREAD_CPUTIME_ID 1 ns
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GetThreadTimes() 100 ns
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========================= ==========
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Examples of clock precision on x86_64:
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========================= ================ =============== ===================
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Name Operating system Precision Precision in Python
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========================= ================ =============== ===================
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CLOCK_THREAD_CPUTIME_ID Linux 3.2 1 ns 6 µs
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CLOCK_THREAD_CPUTIME_ID FreeBSD 8.2 1 µs 1 µs
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GetThreadTimes() Windows Seven 16 ms ?
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CLOCK_THREAD_CPUTIME_ID Linux 3.2 1 ns 6 µs
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GetThreadTimes() Windows Seven 16 ms 16 ms
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========================= ================ =============== ===================
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For CLOCK_THREAD_CPUTIME_ID, the precision of this table is the result
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