[Python-checkins] cpython: Issue #14428: Use the new time.perf_counter() and time.process_time() functions
victor.stinner
python-checkins at python.org
Sun Apr 29 03:04:16 CEST 2012
http://hg.python.org/cpython/rev/bd195749c0a2
changeset: 76599:bd195749c0a2
user: Victor Stinner <victor.stinner at gmail.com>
date: Sun Apr 29 03:01:20 2012 +0200
summary:
Issue #14428: Use the new time.perf_counter() and time.process_time() functions
* Replace "time.clock on windows, or time.time" with time.perf_counter()
* profile module: only use time.process_time() instead of trying different
functions providing the process time
* timeit module: use time.perf_counter() by default, time.time() and
time.clock() can still be used using --time and --clock options
* pybench program: use time.perf_counter() by default, add support for
the new time.process_time() and time.perf_counter() functions, but stay
backward compatible. Use also time.get_clock_info() to display information
of the timer.
files:
Doc/includes/mp_benchmarks.py | 6 +---
Lib/idlelib/ColorDelegator.py | 4 +-
Lib/profile.py | 36 +---------------------
Lib/test/reperf.py | 4 +-
Lib/test/sortperf.py | 4 +-
Lib/timeit.py | 12 +-----
Tools/pybench/pybench.py | 21 ++++++++++++-
7 files changed, 32 insertions(+), 55 deletions(-)
diff --git a/Doc/includes/mp_benchmarks.py b/Doc/includes/mp_benchmarks.py
--- a/Doc/includes/mp_benchmarks.py
+++ b/Doc/includes/mp_benchmarks.py
@@ -6,16 +6,12 @@
#
import time
-import sys
import multiprocessing
import threading
import queue
import gc
-if sys.platform == 'win32':
- _timer = time.clock
-else:
- _timer = time.time
+_timer = time.perf_counter
delta = 1
diff --git a/Lib/idlelib/ColorDelegator.py b/Lib/idlelib/ColorDelegator.py
--- a/Lib/idlelib/ColorDelegator.py
+++ b/Lib/idlelib/ColorDelegator.py
@@ -149,9 +149,9 @@
self.stop_colorizing = False
self.colorizing = True
if DEBUG: print("colorizing...")
- t0 = time.clock()
+ t0 = time.perf_counter()
self.recolorize_main()
- t1 = time.clock()
+ t1 = time.perf_counter()
if DEBUG: print("%.3f seconds" % (t1-t0))
finally:
self.colorizing = False
diff --git a/Lib/profile.py b/Lib/profile.py
--- a/Lib/profile.py
+++ b/Lib/profile.py
@@ -83,26 +83,6 @@
else:
return prof.print_stats(sort)
-if hasattr(os, "times"):
- def _get_time_times(timer=os.times):
- t = timer()
- return t[0] + t[1]
-
-# Using getrusage(3) is better than clock(3) if available:
-# on some systems (e.g. FreeBSD), getrusage has a higher resolution
-# Furthermore, on a POSIX system, returns microseconds, which
-# wrap around after 36min.
-_has_res = 0
-try:
- import resource
- resgetrusage = lambda: resource.getrusage(resource.RUSAGE_SELF)
- def _get_time_resource(timer=resgetrusage):
- t = timer()
- return t[0] + t[1]
- _has_res = 1
-except ImportError:
- pass
-
class Profile:
"""Profiler class.
@@ -155,20 +135,8 @@
self.bias = bias # Materialize in local dict for lookup speed.
if not timer:
- if _has_res:
- self.timer = resgetrusage
- self.dispatcher = self.trace_dispatch
- self.get_time = _get_time_resource
- elif hasattr(time, 'clock'):
- self.timer = self.get_time = time.clock
- self.dispatcher = self.trace_dispatch_i
- elif hasattr(os, 'times'):
- self.timer = os.times
- self.dispatcher = self.trace_dispatch
- self.get_time = _get_time_times
- else:
- self.timer = self.get_time = time.time
- self.dispatcher = self.trace_dispatch_i
+ self.timer = self.get_time = time.process_time
+ self.dispatcher = self.trace_dispatch_i
else:
self.timer = timer
t = self.timer() # test out timer function
diff --git a/Lib/test/reperf.py b/Lib/test/reperf.py
--- a/Lib/test/reperf.py
+++ b/Lib/test/reperf.py
@@ -9,13 +9,13 @@
timefunc(10, p.findall, s)
def timefunc(n, func, *args, **kw):
- t0 = time.clock()
+ t0 = time.perf_counter()
try:
for i in range(n):
result = func(*args, **kw)
return result
finally:
- t1 = time.clock()
+ t1 = time.perf_counter()
if n > 1:
print(n, "times", end=' ')
print(func.__name__, "%.3f" % (t1-t0), "CPU seconds")
diff --git a/Lib/test/sortperf.py b/Lib/test/sortperf.py
--- a/Lib/test/sortperf.py
+++ b/Lib/test/sortperf.py
@@ -57,9 +57,9 @@
sys.stdout.flush()
def doit(L):
- t0 = time.clock()
+ t0 = time.perf_counter()
L.sort()
- t1 = time.clock()
+ t1 = time.perf_counter()
print("%6.2f" % (t1-t0), end=' ')
flush()
diff --git a/Lib/timeit.py b/Lib/timeit.py
--- a/Lib/timeit.py
+++ b/Lib/timeit.py
@@ -15,8 +15,8 @@
-n/--number N: how many times to execute 'statement' (default: see below)
-r/--repeat N: how many times to repeat the timer (default 3)
-s/--setup S: statement to be executed once initially (default 'pass')
- -t/--time: use time.time() (default on Unix)
- -c/--clock: use time.clock() (default on Windows)
+ -t/--time: use time.time()
+ -c/--clock: use time.clock()
-v/--verbose: print raw timing results; repeat for more digits precision
-h/--help: print this usage message and exit
--: separate options from statement, use when statement starts with -
@@ -66,13 +66,7 @@
dummy_src_name = "<timeit-src>"
default_number = 1000000
default_repeat = 3
-
-if sys.platform == "win32":
- # On Windows, the best timer is time.clock()
- default_timer = time.clock
-else:
- # On most other platforms the best timer is time.time()
- default_timer = time.time
+default_timer = time.perf_counter
# Don't change the indentation of the template; the reindent() calls
# in Timer.__init__() depend on setup being indented 4 spaces and stmt
diff --git a/Tools/pybench/pybench.py b/Tools/pybench/pybench.py
--- a/Tools/pybench/pybench.py
+++ b/Tools/pybench/pybench.py
@@ -73,11 +73,15 @@
# Timer types
TIMER_TIME_TIME = 'time.time'
+TIMER_TIME_PROCESS_TIME = 'time.process_time'
+TIMER_TIME_PERF_COUNTER = 'time.perf_counter'
TIMER_TIME_CLOCK = 'time.clock'
TIMER_SYSTIMES_PROCESSTIME = 'systimes.processtime'
# Choose platform default timer
-if sys.platform[:3] == 'win':
+if hasattr(time, 'perf_counter'):
+ TIMER_PLATFORM_DEFAULT = TIMER_TIME_PERF_COUNTER
+elif sys.platform[:3] == 'win':
# On WinXP this has 2.5ms resolution
TIMER_PLATFORM_DEFAULT = TIMER_TIME_CLOCK
else:
@@ -93,6 +97,10 @@
if timertype == TIMER_TIME_TIME:
return time.time
+ elif timertype == TIMER_TIME_PROCESS_TIME:
+ return time.process_time
+ elif timertype == TIMER_TIME_PERF_COUNTER:
+ return time.perf_counter
elif timertype == TIMER_TIME_CLOCK:
return time.clock
elif timertype == TIMER_SYSTIMES_PROCESSTIME:
@@ -866,7 +874,18 @@
print('* using timer: systimes.processtime (%s)' % \
systimes.SYSTIMES_IMPLEMENTATION)
else:
+ # Check that the clock function does exist
+ try:
+ get_timer(timer)
+ except TypeError:
+ print("* Error: Unknown timer: %s" % timer)
+ return
+
print('* using timer: %s' % timer)
+ if hasattr(time, 'get_clock_info'):
+ info = time.get_clock_info(timer[5:])
+ print('* timer: resolution=%s, implementation=%s'
+ % (info.resolution, info.implementation))
print()
--
Repository URL: http://hg.python.org/cpython
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