How to make this faster

[Helmut Jarausch]

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