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Re: Lexical binding: why?

From: Tadeus Prastowo
Subject: Re: Lexical binding: why?
Date: Tue, 28 May 2019 14:01:27 +0200

Hi Alan,

On Tue, May 28, 2019 at 12:53 PM Alan Mackenzie <address@hidden> 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,

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