Re: [Gimp-print-devel] gs6.21 + gimp-print pre3.1.4 + STC900 problems

[Ron v. O. <R.A...@Wb...>]

Robert L Krawitz wrote:
> 
>    Date: Sat, 06 May 2000 14:37:35 +0200
>    From: Ron van Ostayen <R.A...@Wb...>
> 
>    As you can see, update_dither and print_color have been succesfully
>    inlined and more important the runtime is MUCH better.
>    However, the performance gain is smaller if you run code without debug
>    and profiling information.  The gain is about 30%.  But I think this is
>    substantial enough to put the change into the repository (Robert?).
> 
> If the gain is substantial when compiling optimized then it's worth
> doing.  Don't trust any gains made with anything not compiled with the
> appropriate -O flag.

These tests were performed using -O2 -pg.  
-O2 is the default ghostscript setting.

> 
> BTW, you might also want to try compiling -O6 -funroll-loops or some
> other options.

In my experience you can gain a few percent using agressive optimization
settings.
We're looking for algorithmic optimizations here in order to speed the
code up a lot more.

> 
>    Nevertheless I think the code would speed up a lot if all functions that
>    are called for every dot are inlined.
> 
> That's probably true.

Is this something you'll implement in upcoming releases?

Ron van Ostayen
R.A...@Wb...
Laboratory of Tribology
Department of Mechanical Engineering
University of Technology Delft