GNU bug report logs - #18752
24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?

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Message #20 received at 18752 <at> debbugs.gnu.org (full text, mbox):

From: Fabrice Niessen <fni-news <at> pirilampo.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 18752 <at> debbugs.gnu.org, cygwin <at> cygwin.com, dmoncayo <at> gmail.com
Subject: Re: bug#18752: 24.3.94;
 Why is Cygwin Emacs 2x quicker than Windows Emacs?
Date: Sat, 18 Oct 2014 08:51:12 +0200

Eli Zaretskii wrote:
> Fabrice Niessen wrote:
>> 
>>> You also forgot to tell what compiler options were used for each
>>> build.  E.g., if the Cygwin build is optimized, whereas the MinGW
>>> build is not, the twofold speedup is expected (I generally see
>>> a factor of 2.5 between an optimized and unoptimized build).
>> 
>> I have no idea how Cygwin Emacs gets compiled, nor Windows Emacs
>> (done by Dani). Putting them in Cc.
>
> As Ken points out, the variable system-configuration-options is the
> way to tell.

On my Windows Emacs:

"--enable-checking 'CFLAGS=-O0 -g3' CPPFLAGS=-DGLYPH_DEBUG=1"

> Given that the Cygwin build is optimized, it suffices to show that the
> MinGW one isn't, to explain the difference in speed.

Dani, can you build an optimized version as well next time?

Thanks!

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