* Byte-compiling and lexical scoping for performance
@ 2016-12-12 14:51 Clément Pit--Claudel
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From: Clément Pit--Claudel @ 2016-12-12 14:51 UTC (permalink / raw)
To: Emacs developers
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Hi emacs-devel,
The article at http://nullprogram.com/blog/2016/12/11/ is an interesting read:
> Faster Elfeed Search Through JIT Byte-code Compilation
>
> Today I pushed an update for Elfeed that doubles the speed of the
> search filter in the worse case. […]
>
> There’s one last thing to watch out for. Everything so far has been
> compiled with lexical scope. […]
>
> Lexical scope has better performance. Here are all the benchmarks
> with the default dynamic scope: […]
>
> It halves the performance […] Under dynamic scope, local variables
> use the varref opcode — a global variable lookup — instead of the
> stack-ref opcode — a simple array index.
(sending this here and not to -discuss because IIRC we have few examples of lexical binding being used for performance — json.el is the only one I remember)
Cheers,
Clément.
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2016-12-12 14:51 Byte-compiling and lexical scoping for performance Clément Pit--Claudel
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