Re: Lexical binding: why?

[Tadeus Prastowo <tadeus.prastowo@unitn.it>]

Hi Alan,

On Tue, May 28, 2019 at 12:53 PM Alan Mackenzie <acm@muc.de> wrote:
>
> Hello, Emacs.
>
> What is the purpose of converting Lisp files to use lexical binding?

AFAIK, the primary objective is to allow a multi-threaded Emacs.

> I always thought the idea was to speed the SW up.  However, when I tried
> converting CC Mode to lexical binding, I got the following timings for
> two of my personal benchmarks:
>
>                   Dynamic binding             Lexical binding
>
> Benchmark 1           7.249s                      7.423s
>
> Benchmark 2          16.743s                     16.691s
>
> .  I thus see no speedup from the use of lexical binding.

Perhaps it is because a multi-threaded Emacs has not arrived yet?

> Have I, perhaps, made some mistake somewhere?  Does anybody else see
> significant speed increases through the use of lexical binding?
>
> --
> Alan Mackenzie (Nuremberg, Germany).

-- 
Best regards,
Tadeus