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# encoding: utf-8
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"""
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Utilities for timing code execution.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import time
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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# If possible (Unix), use the resource module instead of time.clock()
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try:
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import resource
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def clocku():
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"""clocku() -> floating point number
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Return the *USER* CPU time in seconds since the start of the process.
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This is done via a call to resource.getrusage, so it avoids the
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wraparound problems in time.clock()."""
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return resource.getrusage(resource.RUSAGE_SELF)[0]
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def clocks():
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"""clocks() -> floating point number
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Return the *SYSTEM* CPU time in seconds since the start of the process.
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This is done via a call to resource.getrusage, so it avoids the
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wraparound problems in time.clock()."""
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return resource.getrusage(resource.RUSAGE_SELF)[1]
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def clock():
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"""clock() -> floating point number
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Return the *TOTAL USER+SYSTEM* CPU time in seconds since the start of
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the process. This is done via a call to resource.getrusage, so it
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avoids the wraparound problems in time.clock()."""
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u,s = resource.getrusage(resource.RUSAGE_SELF)[:2]
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return u+s
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def clock2():
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"""clock2() -> (t_user,t_system)
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Similar to clock(), but return a tuple of user/system times."""
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return resource.getrusage(resource.RUSAGE_SELF)[:2]
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except ImportError:
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# There is no distinction of user/system time under windows, so we just use
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# time.clock() for everything...
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clocku = clocks = clock = time.clock
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def clock2():
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"""Under windows, system CPU time can't be measured.
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This just returns clock() and zero."""
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return time.clock(),0.0
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def timings_out(reps,func,*args,**kw):
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"""timings_out(reps,func,*args,**kw) -> (t_total,t_per_call,output)
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Execute a function reps times, return a tuple with the elapsed total
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CPU time in seconds, the time per call and the function's output.
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Under Unix, the return value is the sum of user+system time consumed by
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the process, computed via the resource module. This prevents problems
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related to the wraparound effect which the time.clock() function has.
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Under Windows the return value is in wall clock seconds. See the
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documentation for the time module for more details."""
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reps = int(reps)
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assert reps >=1, 'reps must be >= 1'
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if reps==1:
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start = clock()
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out = func(*args,**kw)
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tot_time = clock()-start
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else:
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rng = xrange(reps-1) # the last time is executed separately to store output
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start = clock()
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for dummy in rng: func(*args,**kw)
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out = func(*args,**kw) # one last time
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tot_time = clock()-start
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av_time = tot_time / reps
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return tot_time,av_time,out
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def timings(reps,func,*args,**kw):
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"""timings(reps,func,*args,**kw) -> (t_total,t_per_call)
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Execute a function reps times, return a tuple with the elapsed total CPU
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time in seconds and the time per call. These are just the first two values
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in timings_out()."""
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return timings_out(reps,func,*args,**kw)[0:2]
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def timing(func,*args,**kw):
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"""timing(func,*args,**kw) -> t_total
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Execute a function once, return the elapsed total CPU time in
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seconds. This is just the first value in timings_out()."""
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return timings_out(1,func,*args,**kw)[0]
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