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Re: How to make this faster

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On Sat, 06 Jul 2013 03:05:30 +0000, Steven D'Aprano wrote:

> That doesn't explain how you time it, only that you have a loop executing 
> 100 times. Are you using time.time, or time.clock? (I trust you're not 
> measuring times by hand with a stop watch.)
> 
> I expect you're probably doing something like this:
> 
> start = time.time()

I have been using  time.process_time

 
>> If the timing version, which executes function "Solve" one hundred
>> times, runs about 80-100 seconds without a significant variation, then
>> taking the mean is mathematically correct.


> For longer running code, like this, you might also like this:
> http://code.activestate.com/recipes/577896/


Thanks for the pointer.


> If the best you can say is it takes "80-100 seconds", that's pretty 
> significant variation, of the order of 20%.

That's not a variation of a SINGLE variant. One variant takes 80 seconds
and the other variant to be compared with takes 100 seconds.

> 
> In this case, with times of the order of a second per loop, it may be 
> reasonable to say "in this specific case, the error is too small to care 
> about", or "I just don't care about the error, since it will be about the 
> same for different variations of my solve function". But in that case, 
> why bother looping 100 times?
> 
> 
>> I can't take the minimum
>> since I don't measure the time a single call takes.
> 
> Then perhaps you should.

Many thanks,
Helmut

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Thread

How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 08:22 +0000
  Re: How to make this faster Fábio Santos <fabiosantosart@gmail.com> - 2013-07-05 10:38 +0100
  Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 10:07 +0000
  Re: How to make this faster Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-07-05 11:13 +0100
  Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 10:53 +0000
    Re: How to make this faster Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-05 12:02 +0000
    Re: How to make this faster Fábio Santos <fabiosantosart@gmail.com> - 2013-07-05 13:44 +0100
    Re: How to make this faster Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-07-05 14:41 +0100
    Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 14:28 +0000
      Re: How to make this faster Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-07-05 15:45 +0100
    Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 14:48 +0000
      Re: How to make this faster Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-07-05 16:26 +0100
    Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 14:54 +0000
      Re: How to make this faster Fábio Santos <fabiosantosart@gmail.com> - 2013-07-05 16:18 +0100
      Re: How to make this faster Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-05 16:24 +0000
    Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 15:17 +0000
      Re: How to make this faster Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-07-05 16:38 +0100
      Re: How to make this faster MRAB <python@mrabarnett.plus.com> - 2013-07-05 17:25 +0100
      Re: How to make this faster Joshua Landau <joshua.landau.ws@gmail.com> - 2013-07-06 02:45 +0100
    Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 15:47 +0000
      Re: How to make this faster Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-05 16:52 +0000
    Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 16:07 +0000
      Re: How to make this faster Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-05 16:50 +0000
        Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 18:39 +0000
          Re: How to make this faster Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-06 03:05 +0000
          Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-06 07:25 +0000
    Re: How to make this faster Helmut Jarausch <jarausch@igpm.rwth-aachen.de> - 2013-07-05 18:42 +0000

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