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PEP 418: Complete "Precision in Python" column in the different tables

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Victor Stinner 2012-04-14 00:17:54 +02:00
parent 165038702e
commit 44f95fb601
1 changed files with 35 additions and 32 deletions
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pep-0418.txt
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@ -725,15 +725,15 @@ Examples of clock precision on x86_64:
========================= ================ ========= =================== ========================= ================ ========= ===================
Name Operating system Precision Precision in Python Name Operating system Precision Precision in Python
========================= ================ ========= =================== ========================= ================ ========= ===================
CLOCK_MONOTONIC_RAW Linux 3.2 1 ns 3 µs CLOCK_HIGHRES SunOS 5.11 2 ns 2 µs
CLOCK_MONOTONIC Linux 3.2 1 ns 2 µs CLOCK_MONOTONIC Linux 3.2 1 ns 2 µs
CLOCK_HIGHRES SunOS 5.11 2 ns ? CLOCK_MONOTONIC SunOS 5.11 2 ns 3 µs
CLOCK_MONOTONIC SunOS 5.11 2 ns ? CLOCK_MONOTONIC_RAW Linux 3.2 1 ns 3 µs
QueryPerformanceCounter Windows Seven 10 ns ?
CLOCK_UPTIME FreeBSD 8.2 11 ns 9 µs
CLOCK_MONOTONIC FreeBSD 8.2 11 ns 7 µs CLOCK_MONOTONIC FreeBSD 8.2 11 ns 7 µs
CLOCK_MONOTONIC OpenBSD 5.0 10 ms ? CLOCK_MONOTONIC OpenBSD 5.0 10 ms 7 µs
GetTickCount Windows Seven 16 ms ? QueryPerformanceCounter Windows Seven 10 ns 9 µs
CLOCK_UPTIME FreeBSD 8.2 11 ns 9 µs
GetTickCount Windows Seven 16 ms 15 ms
========================= ================ ========= =================== ========================= ================ ========= ===================
For CLOCK_xxx clocks, the precision of this table is the result of For CLOCK_xxx clocks, the precision of this table is the result of
@ -976,11 +976,11 @@ Examples of clock precision on x86_64:
========================= ================ ========= =================== ========================= ================ ========= ===================
Name Operating system Precision Precision in Python Name Operating system Precision Precision in Python
========================= ================ ========= =================== ========================= ================ ========= ===================
CLOCK_REALTIME SunOS 5.11 10 ms 2 µs
CLOCK_REALTIME Linux 3.2 1 ns 2 µs CLOCK_REALTIME Linux 3.2 1 ns 2 µs
CLOCK_REALTIME FreeBSD 8.2 11 ns 7 µs CLOCK_REALTIME FreeBSD 8.2 11 ns 7 µs
CLOCK_REALTIME SunOS 5.11 10 ms ? CLOCK_REALTIME OpenBSD 5.0 10 ms 10 µs
CLOCK_REALTIME OpenBSD 5.0 10 ms ? GetSystemTimeAsFileTime Windows Seven 16 ms 1 ms
GetSystemTimeAsFileTime Windows Seven 16 ms ?
========================= ================ ========= =================== ========================= ================ ========= ===================
For CLOCK_REALTIME, the precision of this table is the result of For CLOCK_REALTIME, the precision of this table is the result of
@ -1026,15 +1026,15 @@ Process time
The process time cannot be set. It is not monotonic: the clocks stop The process time cannot be set. It is not monotonic: the clocks stop
while the process is idle. while the process is idle.
========================= =============== ============= ========================= ========== =============
Name Resolution Include sleep Name Resolution Include sleep
========================= =============== ============= ========================= ========== =============
GetProcessTimes() 100 ns No GetProcessTimes() 100 ns No
CLOCK_PROCESS_CPUTIME_ID 1 ns No CLOCK_PROCESS_CPUTIME_ID 1 ns No
getrusage() 1 µs No getrusage(RUSAGE_SELF) 1 µs No
times() \- No times() \- No
clock() \- No (*) clock() \- No (*)
========================= =============== ============= ========================= ========== =============
(*) On Windows, clock() does include time elapsed during a sleep. It does not (*) On Windows, clock() does include time elapsed during a sleep. It does not
on other operating systems. on other operating systems.
@ -1044,15 +1044,18 @@ Examples of clock precision on x86_64:
========================= ================ ========= =================== ========================= ================ ========= ===================
Name Operating system Precision Precision in Python Name Operating system Precision Precision in Python
========================= ================ ========= =================== ========================= ================ ========= ===================
getrusage(RUSAGE_SELF) FreeBSD 8.2 \- 1 µs
CLOCK_PROCESS_CPUTIME_ID Linux 3.2 1 ns 3 µs CLOCK_PROCESS_CPUTIME_ID Linux 3.2 1 ns 3 µs
clock() SunOS 5.11 1 µs ? getrusage(RUSAGE_SELF) SunOS 5.11 \- 3 µs
getrusage() Linux 3.0 4 ms 4 ms getrusage(RUSAGE_SELF) Linux 3.0 4 ms 4 ms
getrusage() FreeBSD 8.2 - 1 µs getrusage(RUSAGE_SELF) OpenBSD 5.0 \- 8 ms
clock() FreeBSD 8.2 8 ms 8 ms clock() FreeBSD 8.2 8 ms 8 ms
clock() Linux 3.2 1 µs 10 ms clock() Linux 3.2 1 µs 10 ms
times() Linux 3.0 10 ms 10 ms times() Linux 3.0 10 ms 10 ms
clock() OpenBSD 5.0 10 ms ? clock() OpenBSD 5.0 10 ms 10 ms
GetProcessTimes() Windows Seven 16 ms ? times() OpenBSD 5.0 10 ms 10 ms
GetProcessTimes() Windows Seven 16 ms 16 ms
clock() SunOS 5.11 1 µs 10 ms
========================= ================ ========= =================== ========================= ================ ========= ===================
The precision of clock() in this table is the result of 1 / The precision of clock() in this table is the result of 1 /
@ -1080,7 +1083,7 @@ Functions
program. program.
* times() * times()
* getrusage(): ru_utime and ru_stime fields * getrusage(RUSAGE_SELF): ru_utime and ru_stime fields
Python source code includes a portable library to get the process time (CPU Python source code includes a portable library to get the process time (CPU
time): `Tools/pybench/systimes.py time): `Tools/pybench/systimes.py
@ -1093,21 +1096,21 @@ Thread time
The thread time cannot be set. It is not monotonic: the clocks stop The thread time cannot be set. It is not monotonic: the clocks stop
while the thread is idle. while the thread is idle.
========================= =============== ========================= ==========
Name Resolution Name Resolution
========================= =============== ========================= ==========
GetThreadTimes() 100 ns CLOCK_THREAD_CPUTIME_ID 1 ns
CLOCK_THREAD_CPUTIME_ID 1 ns GetThreadTimes() 100 ns
========================= =============== ========================= ==========
Examples of clock precision on x86_64: Examples of clock precision on x86_64:
========================= ================ =============== =================== ========================= ================ =============== ===================
Name Operating system Precision Precision in Python Name Operating system Precision Precision in Python
========================= ================ =============== =================== ========================= ================ =============== ===================
CLOCK_THREAD_CPUTIME_ID Linux 3.2 1 ns 6 µs
CLOCK_THREAD_CPUTIME_ID FreeBSD 8.2 1 µs 1 µs CLOCK_THREAD_CPUTIME_ID FreeBSD 8.2 1 µs 1 µs
GetThreadTimes() Windows Seven 16 ms ? CLOCK_THREAD_CPUTIME_ID Linux 3.2 1 ns 6 µs
GetThreadTimes() Windows Seven 16 ms 16 ms
========================= ================ =============== =================== ========================= ================ =============== ===================
For CLOCK_THREAD_CPUTIME_ID, the precision of this table is the result For CLOCK_THREAD_CPUTIME_ID, the precision of this table is the result