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Re: Two strange messages while building Emacs on MS-Windows

From: Óscar Fuentes
Subject: Re: Two strange messages while building Emacs on MS-Windows
Date: Sun, 09 Dec 2012 20:31:51 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

>> Starting an Emacs process for byte-compiling one .el file is *much*
>> slower on MSWindows than on GNU/Linux. In general, starting a process is
>> much slower on Windows than *nix
> Do you have any numbers to put "slow" and "fast" into perspective?

Good question. This is on the same machine, average of five runs
after warming the cache with one run:

time emacs --batch --eval '(message "Hello")'

Kubuntu 12.10 x86_64  : 0.026 s
Windows XP SP3 32 bits: 0.240 s

Bootstrapping compiles ~1400 el files. The difference on process startup
accounts for >5 minutes. And that's only for byte-compiling. Add
invocations to gcc, make, cmd, fileutils, etc.

Still, most of the difference on bootstrap time is unexplained. Maybe
it's the filesystem, maybe Emacs is super-optimized for GNU/Linux and
not so much for MSWindows...

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