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From: Alan Mackenzie <acm@muc.de>
To: emacs-devel@gnu.org
Subject: Lexical binding: why?
Date: Tue, 28 May 2019 10:08:50 +0000	[thread overview]
Message-ID: <20190528100850.GA5296@ACM> (raw)

Hello, Emacs.

What is the purpose of converting Lisp files to use lexical binding?

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.

Have I, perhaps, made some mistake somewhere?  Does anybody else see
significant speed increases through the use of lexical binding?

-- 
Alan Mackenzie (Nuremberg, Germany).



             reply	other threads:[~2019-05-28 10:08 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-28 10:08 Alan Mackenzie [this message]
2019-05-28 12:01 ` Lexical binding: why? Tadeus Prastowo
2019-05-28 12:26 ` Stefan Monnier
2019-05-28 13:02   ` Dmitry Gutov
2019-05-28 13:25     ` Stefan Monnier
2019-05-28 13:46       ` Dmitry Gutov
2019-05-28 13:44   ` Alan Mackenzie
2019-05-28 17:21     ` Stefan Monnier
2019-05-28 17:41       ` Alan Mackenzie
2019-05-28 17:58         ` Stefan Monnier
2019-05-28 15:19 ` John Wiegley

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