Re: measuring a function time
In article 4c5178ae$0$11091$c3e8...@news.astraweb.com, Steven D'Aprano st...@remove-this-cybersource.com.au wrote: On Thu, 29 Jul 2010 14:42:58 +0200, Matteo Landi wrote: This should be enough import time tic = time.time() function() toc = time.time() print toc - tic You're typing that in the interactive interpreter, which means the timer is counting the seconds while you're typing subsequent commands. At the very least, you need to put that code into a function. There is an alternative, for once the semicolon comes in handy: from time import * x=time(); function(); print time()-x 6.551980773430 The best way to time small code snippets and fast functions is with the timeit module. -- Steven Groetjes Albert -- -- Albert van der Horst, UTRECHT,THE NETHERLANDS Economic growth -- being exponential -- ultimately falters. alb...@spearc.xs4all.nl =n http://home.hccnet.nl/a.w.m.van.der.horst -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
Steven D'Aprano st...@remove-this-cybersource.com.au writes: On Thu, 29 Jul 2010 14:42:58 +0200, Matteo Landi wrote: This should be enough import time tic = time.time() function() toc = time.time() print toc - tic You're typing that in the interactive interpreter, which means the timer is counting the seconds while you're typing subsequent commands. At the very least, you need to put that code into a function. Or, trivially improved as follows: t0 = time.time(); function(); t1 = time.time() print t1 - t0 This technique, while nowhere nearly as thorough as the timeit module, still gives useful results for simple measurements. -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
On Fri, 2010-07-30 at 14:28 +0200, Hrvoje Niksic wrote: Steven D'Aprano st...@remove-this-cybersource.com.au writes: On Thu, 29 Jul 2010 14:42:58 +0200, Matteo Landi wrote: This should be enough import time tic = time.time() function() toc = time.time() print toc - tic You're typing that in the interactive interpreter, which means the timer is counting the seconds while you're typing subsequent commands. At the very least, you need to put that code into a function. Or, trivially improved as follows: t0 = time.time(); function(); t1 = time.time() print t1 - t0 I'll just throw this out. I sometimes use a decorator to keep track of a functions execution times: def timed_function(f): Function decorator that records the execution time of a function import time def funct(*args, **kwargs): __starttime = time.time() result = f(*args, **kwargs) __endtime = time.time() funct.runtime = __endtime - __starttime return result return funct Then from goodies import timed_function from time import sleep @timed_function ... def test(n): ... sleep(n) ... test(4) test.runtime 4.003864049911499 Works for simple stuff anyway. -a -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
Albert Hopkins wrote: On Fri, 2010-07-30 at 14:28 +0200, Hrvoje Niksic wrote: Steven D'Aprano st...@remove-this-cybersource.com.au writes: On Thu, 29 Jul 2010 14:42:58 +0200, Matteo Landi wrote: This should be enough import time tic = time.time() function() toc = time.time() print toc - tic You're typing that in the interactive interpreter, which means the timer is counting the seconds while you're typing subsequent commands. At the very least, you need to put that code into a function. Or, trivially improved as follows: t0 = time.time(); function(); t1 = time.time() print t1 - t0 I'll just throw this out. I sometimes use a decorator to keep track of a functions execution times: def timed_function(f): Function decorator that records the execution time of a function import time def funct(*args, **kwargs): __starttime = time.time() result = f(*args, **kwargs) __endtime = time.time() funct.runtime = __endtime - __starttime return result return funct Then from goodies import timed_function from time import sleep @timed_function ... def test(n): ... sleep(n) ... test(4) test.runtime 4.003864049911499 Works for simple stuff anyway. That won't work very well for functions which don't run for long. You could fix that by adding a counter for the number of times it's run and the total time. -- http://mail.python.org/mailman/listinfo/python-list
measuring a function time
Hi, I want to measure a function run time. I read http://docs.python.org/library/time.html but I am confused and don't know which one is suitable. I don't know is daylight timing important or not or is Y2K issue important for my case or not I also don't know how epoch time is related to my work. I just want to do this (pseudocode): start_time = get_current_time; function(); end_time = get_current_time; print (end_time - start_time) the output should be 7600 (s) for example. What is the best and easiest way to do that? Thanks, // Naderan *Mahmood; -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
This should be enough import time tic = time.time() function() toc = time.time() print toc - tic On Thu, Jul 29, 2010 at 2:34 PM, Mahmood Naderan nt_mahm...@yahoo.com wrote: Hi, I want to measure a function run time. I read http://docs.python.org/library/time.html but I am confused and don't know which one is suitable. I don't know is daylight timing important or not or is Y2K issue important for my case or not I also don't know how epoch time is related to my work. I just want to do this (pseudocode): start_time = get_current_time; function(); end_time = get_current_time; print (end_time - start_time) the output should be 7600 (s) for example. What is the best and easiest way to do that? Thanks, // Naderan *Mahmood; -- http://mail.python.org/mailman/listinfo/python-list -- Matteo Landi http://www.matteolandi.net/ -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
On Thu, Jul 29, 2010 at 8:34 AM, Mahmood Naderan nt_mahm...@yahoo.com wrote: the output should be 7600 (s) for example. What is the best and easiest way to do that? Take a look at time.clock() http://docs.python.org/library/time.html#time.clock this is the function to use for benchmarking Python or timing algorithms. -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
On Thu, 29 Jul 2010 14:42:58 +0200, Matteo Landi wrote: This should be enough import time tic = time.time() function() toc = time.time() print toc - tic You're typing that in the interactive interpreter, which means the timer is counting the seconds while you're typing subsequent commands. At the very least, you need to put that code into a function. More importantly, the above technique is acceptable if function() is very long-running (multiple seconds, at least). If it is quick, or a code- snippet, the time you measure will be dominated by random chance. The best way to time small code snippets and fast functions is with the timeit module. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
Thanks, the first method worked. However clock() doesn't. tic = time.time() time.sleep( 2 ) toc = time.time() print toc - tic Result: 2.00269889832 Take a look at time.clock() tic = time.clock() time.sleep( 2 ) toc = time.clock() print toc - tic result: 0.0 More importantly, the above technique is acceptable if function() is very long-running (multiple seconds, at least). yes, the code is long running. Thanks // Naderan *Mahmood; From: Matteo Landi landima...@gmail.com To: Mahmood Naderan nt_mahm...@yahoo.com Cc: python mailing list python-list@python.org Sent: Thu, July 29, 2010 5:12:58 PM Subject: Re: measuring a function time This should be enough import time tic = time.time() function() toc = time.time() print toc - tic On Thu, Jul 29, 2010 at 2:34 PM, Mahmood Naderan nt_mahm...@yahoo.com wrote: Hi, I want to measure a function run time. I read http://docs.python.org/library/time.html but I am confused and don't know which one is suitable. I don't know is daylight timing important or not or is Y2K issue important for my case or not I also don't know how epoch time is related to my work. I just want to do this (pseudocode): start_time = get_current_time; function(); end_time = get_current_time; print (end_time - start_time) the output should be 7600 (s) for example. What is the best and easiest way to do that? Thanks, // Naderan *Mahmood; -- http://mail.python.org/mailman/listinfo/python-list -- Matteo Landi http://www.matteolandi.net/ -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
On Thu, 29 Jul 2010 08:45:23 -0400 Joe Riopel goo...@gmail.com wrote: On Thu, Jul 29, 2010 at 8:34 AM, Mahmood Naderan nt_mahm...@yahoo.com wrote: the output should be 7600 (s) for example. What is the best and easiest way to do that? Take a look at time.clock() I don't know if that's what he wants. The clock() method returns processor time, not wall time. Python 2.6.5 (r265:79063, Jul 8 2010, 16:01:18) [GCC 4.1.3 20080704 prerelease (NetBSD nb2 20081120)] on netbsd5 Type help, copyright, credits or license for more information. from time import time, clock, sleep t = time() print time() - t, clock() 0.000596046447754 0.03 sleep(3) print time() - t, clock() 3.03474903107 0.03 x = open(BIGFILE).read() print time() - t, clock() 10.2008538246 1.42 -- D'Arcy J.M. Cain da...@druid.net | Democracy is three wolves http://www.druid.net/darcy/| and a sheep voting on +1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner. -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
I just use ipython's functions (that are themselves just calls to the time module functions) for timing my functions... Enter: %timeit? or %time At the Ipython command prompt to get started. Ben R. On Jul 29, 2010, at 7:43 AM, D'Arcy J.M. Cain wrote: On Thu, 29 Jul 2010 08:45:23 -0400 Joe Riopel goo...@gmail.com wrote: On Thu, Jul 29, 2010 at 8:34 AM, Mahmood Naderan nt_mahm...@yahoo.com wrote: the output should be 7600 (s) for example. What is the best and easiest way to do that? Take a look at time.clock() I don't know if that's what he wants. The clock() method returns processor time, not wall time. Python 2.6.5 (r265:79063, Jul 8 2010, 16:01:18) [GCC 4.1.3 20080704 prerelease (NetBSD nb2 20081120)] on netbsd5 Type help, copyright, credits or license for more information. from time import time, clock, sleep t = time() print time() - t, clock() 0.000596046447754 0.03 sleep(3) print time() - t, clock() 3.03474903107 0.03 x = open(BIGFILE).read() print time() - t, clock() 10.2008538246 1.42 -- D'Arcy J.M. Cain da...@druid.net | Democracy is three wolves http://www.druid.net/darcy/| and a sheep voting on +1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: measuring a function time
Someone should port Perl's Benchmark.pm module to python that's such a useful module to measure a functions execution time and CPU usage. Sent from my iPhone 4. On Jul 29, 2010, at 3:43 PM, Benjamin J. Racine bjrac...@glosten.com wrote: I just use ipython's functions (that are themselves just calls to the time module functions) for timing my functions... Enter: %timeit? or %time At the Ipython command prompt to get started. Ben R. On Jul 29, 2010, at 7:43 AM, D'Arcy J.M. Cain wrote: On Thu, 29 Jul 2010 08:45:23 -0400 Joe Riopel goo...@gmail.com wrote: On Thu, Jul 29, 2010 at 8:34 AM, Mahmood Naderan nt_mahm...@yahoo.com wrote: the output should be 7600 (s) for example. What is the best and easiest way to do that? Take a look at time.clock() I don't know if that's what he wants. The clock() method returns processor time, not wall time. Python 2.6.5 (r265:79063, Jul 8 2010, 16:01:18) [GCC 4.1.3 20080704 prerelease (NetBSD nb2 20081120)] on netbsd5 Type help, copyright, credits or license for more information. from time import time, clock, sleep t = time() print time() - t, clock() 0.000596046447754 0.03 sleep(3) print time() - t, clock() 3.03474903107 0.03 x = open(BIGFILE).read() print time() - t, clock() 10.2008538246 1.42 -- D'Arcy J.M. Cain da...@druid.net | Democracy is three wolves http://www.druid.net/darcy/| and a sheep voting on +1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
