From: Ryan Davis <ryand-ruby@...>
Date: 2005-04-05T06:59:42+09:00
Subject: Re: Extension question


On Apr 4, 2005, at 10:54 AM, Joe Van Dyk wrote:

> And to expand the question...
>
> I'm using the GD library to create the image.  I'm creating the image
> by reading binary data from a file and looping through some
> predetermined width and height and setting each pixel of the picture
> based on the data from the file.
>
> Which parts of this should go in the C extension and which parts
> should stay Ruby?  I'm really scratching my head over this one.

Here is what we suggest in the readme of ruby inline:

** PROFILING STRATEGY:

0) Always keep a log of your progress and changes.
1) Run code with 'time' and large dataset.
2) Run code with '-rprofile' and smaller dataset, large enough to get  
good #s.
3) Examine profile output and translate 1 bottleneck to C.
4) Run new code with 'time' and large dataset. Repeat 2-3 if  
unsatisfied.
5) Run final code with 'time' and compare to the first run.