You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
124 lines
4.1 KiB
Python
124 lines
4.1 KiB
Python
2 years ago
|
# encoding: utf-8
|
||
|
|
"""
|
||
|
|
Utilities for timing code execution.
|
||
|
|
"""
|
||
|
|
|
||
|
|
#-----------------------------------------------------------------------------
|
||
|
|
# Copyright (C) 2008-2011 The IPython Development Team
|
||
|
|
#
|
||
|
|
# Distributed under the terms of the BSD License. The full license is in
|
||
|
|
# the file COPYING, distributed as part of this software.
|
||
|
|
#-----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
#-----------------------------------------------------------------------------
|
||
|
|
# Imports
|
||
|
|
#-----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
import time
|
||
|
|
|
||
|
|
#-----------------------------------------------------------------------------
|
||
|
|
# Code
|
||
|
|
#-----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
# If possible (Unix), use the resource module instead of time.clock()
|
||
|
|
try:
|
||
|
|
import resource
|
||
|
|
except ImportError:
|
||
|
|
resource = None
|
||
|
|
|
||
|
|
# Some implementations (like jyputerlite) don't have getrusage
|
||
|
|
if resource is not None and hasattr(resource, "getrusage"):
|
||
|
|
def clocku():
|
||
|
|
"""clocku() -> floating point number
|
||
|
|
|
||
|
|
Return the *USER* CPU time in seconds since the start of the process.
|
||
|
|
This is done via a call to resource.getrusage, so it avoids the
|
||
|
|
wraparound problems in time.clock()."""
|
||
|
|
|
||
|
|
return resource.getrusage(resource.RUSAGE_SELF)[0]
|
||
|
|
|
||
|
|
def clocks():
|
||
|
|
"""clocks() -> floating point number
|
||
|
|
|
||
|
|
Return the *SYSTEM* CPU time in seconds since the start of the process.
|
||
|
|
This is done via a call to resource.getrusage, so it avoids the
|
||
|
|
wraparound problems in time.clock()."""
|
||
|
|
|
||
|
|
return resource.getrusage(resource.RUSAGE_SELF)[1]
|
||
|
|
|
||
|
|
def clock():
|
||
|
|
"""clock() -> floating point number
|
||
|
|
|
||
|
|
Return the *TOTAL USER+SYSTEM* CPU time in seconds since the start of
|
||
|
|
the process. This is done via a call to resource.getrusage, so it
|
||
|
|
avoids the wraparound problems in time.clock()."""
|
||
|
|
|
||
|
|
u,s = resource.getrusage(resource.RUSAGE_SELF)[:2]
|
||
|
|
return u+s
|
||
|
|
|
||
|
|
def clock2():
|
||
|
|
"""clock2() -> (t_user,t_system)
|
||
|
|
|
||
|
|
Similar to clock(), but return a tuple of user/system times."""
|
||
|
|
return resource.getrusage(resource.RUSAGE_SELF)[:2]
|
||
|
|
|
||
|
|
else:
|
||
|
|
# There is no distinction of user/system time under windows, so we just use
|
||
|
|
# time.process_time() for everything...
|
||
|
|
clocku = clocks = clock = time.process_time
|
||
|
|
|
||
|
|
def clock2():
|
||
|
|
"""Under windows, system CPU time can't be measured.
|
||
|
|
|
||
|
|
This just returns process_time() and zero."""
|
||
|
|
return time.process_time(), 0.0
|
||
|
|
|
||
|
|
|
||
|
|
def timings_out(reps,func,*args,**kw):
|
||
|
|
"""timings_out(reps,func,*args,**kw) -> (t_total,t_per_call,output)
|
||
|
|
|
||
|
|
Execute a function reps times, return a tuple with the elapsed total
|
||
|
|
CPU time in seconds, the time per call and the function's output.
|
||
|
|
|
||
|
|
Under Unix, the return value is the sum of user+system time consumed by
|
||
|
|
the process, computed via the resource module. This prevents problems
|
||
|
|
related to the wraparound effect which the time.clock() function has.
|
||
|
|
|
||
|
|
Under Windows the return value is in wall clock seconds. See the
|
||
|
|
documentation for the time module for more details."""
|
||
|
|
|
||
|
|
reps = int(reps)
|
||
|
|
assert reps >=1, 'reps must be >= 1'
|
||
|
|
if reps==1:
|
||
|
|
start = clock()
|
||
|
|
out = func(*args,**kw)
|
||
|
|
tot_time = clock()-start
|
||
|
|
else:
|
||
|
|
rng = range(reps-1) # the last time is executed separately to store output
|
||
|
|
start = clock()
|
||
|
|
for dummy in rng: func(*args,**kw)
|
||
|
|
out = func(*args,**kw) # one last time
|
||
|
|
tot_time = clock()-start
|
||
|
|
av_time = tot_time / reps
|
||
|
|
return tot_time,av_time,out
|
||
|
|
|
||
|
|
|
||
|
|
def timings(reps,func,*args,**kw):
|
||
|
|
"""timings(reps,func,*args,**kw) -> (t_total,t_per_call)
|
||
|
|
|
||
|
|
Execute a function reps times, return a tuple with the elapsed total CPU
|
||
|
|
time in seconds and the time per call. These are just the first two values
|
||
|
|
in timings_out()."""
|
||
|
|
|
||
|
|
return timings_out(reps,func,*args,**kw)[0:2]
|
||
|
|
|
||
|
|
|
||
|
|
def timing(func,*args,**kw):
|
||
|
|
"""timing(func,*args,**kw) -> t_total
|
||
|
|
|
||
|
|
Execute a function once, return the elapsed total CPU time in
|
||
|
|
seconds. This is just the first value in timings_out()."""
|
||
|
|
|
||
|
|
return timings_out(1,func,*args,**kw)[0]
|
||
|
|
|