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Re: Does py2app improves speed?

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On 11/24/2011 9:27 AM, Dave Angel wrote:
...
> Several ways to speed up code.
>
> 1) use language features to best advantage
> 2) use 3rd party libraries that do certain things well
> 3) use best algorithms, subject to #1 and #2
> 4) have someone else review the code (perhaps on the list, perhaps
> within your own organization)
> 5) measure (eg. profile it)
> 6) use optimizing tools, such as pypy or Cython.
> 7) rewrite parts of it in another language
> 8) get a faster processor
> 9) rewrite it all in another language
>
> It takes experience to choose between these, and each project is
> different. But even the most experienced developers will frequently
> guess entirely wrong where the bottleneck is, which is why you measure
> if you care.

I agree that measuring (profiling) is the most critical.

As you say, even the most experienced programmers can guess wrong.  The 
first time I used a profiler a couple of decades ago I was egotistical 
enough to wonder how this thing could help me.  After all, I wrote the 
code.  I knew what it did.  The profiler wasn't going to tell me 
anything I didn't know.

I learned  a little humility after reading the profiler output.  The 
program was spending most of its time in a place that I never dreamed 
was a problem, and a 10 minute fix cut run times in half.

In that particular case there wasn't even a design problem, it was just 
a procedure call inside a tight loop that executed far more often than I 
imagined and could be replaced with a few lines of inline code.

I think the rest of your list is excellent too.

     Alan

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Re: Does py2app improves speed? Dave Angel <d@davea.name> - 2011-11-24 09:27 -0500
  Re: Does py2app improves speed? Alan Meyer <ameyer2@yahoo.com> - 2011-11-28 15:03 -0500
    Re: Does py2app improves speed? Dave Angel <d@davea.name> - 2011-11-28 22:53 -0500

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