How to determine if printing is being a bottleneck in my code?

Roy Smith roy at
Wed Dec 5 03:36:35 CET 2012

In article <29c74a30-f017-44b5-8a3d-a3c0d659277d at>,
 SherjilOzair <sherjilozair at> wrote:

> Hello list,
> When it comes to printing things while some computation is being done, there 
> are 2 extremes.
> 1. printing speed is slower than data-to-print generation speed. In this 
> case, printing is a bottleneck. Examples: "for i in xrange(2**30): print i". 
> Without the print, this code would be much faster.
> 2. data-to-print generation speed is slower than printing speed. So, this 
> case, printing does now slow you down much. Example: for m in matrices: print 
> m.inverse() # inverse is a time-taking function
> These two cases are pretty easy. But, my question is, how to draw the line? 
> How do I know that print is slowing me down, and I should probably remove 
> some of them? Is there a scientific way to do this, rather than just 
> intuition and guesswork?
> I can clarify, if needed.
> Thanks,
> Sherjil Ozair

The profiler ( is your 

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