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Message-ID: <004701c56f79$1eb791c0$d119fea9@pcdahl4201>
From: "Thorsten Dahlheimer" <thorsten DOT dahlheimer AT gmx DOT net>
To: <cygwin AT cygwin DOT com>
References:  <20050610150729 DOT GA13181 AT trixie DOT casa DOT cgf DOT cx> <20050610231343 DOT 6A12713C0A7 AT cgf DOT cx> <20050611003817 DOT GB1106 AT trixie DOT casa DOT cgf DOT cx> <d8egni$vd3$1 AT sea DOT gmane DOT org>
Subject: Re: Making /bin/sh == bash.  Has the time come?
Date: Sun, 12 Jun 2005 20:03:41 +0200
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Krzysztof Duleba wrote:
> Christopher Faylor wrote:
> > On Fri, Jun 10, 2005 at 06:13:31PM -0500, Gary R. Van Sickle wrote:
> > >Configuring wxWindows from cvs, on a 3.4GHz P4:
> > >
> > >Sh = Ash:
> > >real    3m55.351s
> > >user    5m8.610s
> > >sys     1m53.240s
> > >
> > >Sh = Bash:
> > >real    3m41.850s
> > >user    5m6.220s
> > >sys     1m53.426s
> > >
> > >Looks like the time has come.
> > 
> > Wow.  I never expected that bash would actually be faster.
> > 
> > I would appreciate getting a few more benchmarks for other packages.
> > If this holds out then moving to bash is a no-brainer.
> 
> Similar results here. Configuring on Athlon 2200 gives
> 
> 1. octave 2.1.57:
> sh = ash
> real    2m48.347s
> user    4m13.299s
> sys     1m25.203s
> 
> sh = bash
> real    2m38.129s
> user    4m11.777s
> sys     1m23.915s
> 
> 2. netcat 0.7.1
> sh = ash
> real    0m56.847s
> user    1m29.808s
> sys     0m30.186s
> 
> sh = bash
> real    0m57.015s
> user    1m28.878s
> sys     0m29.338s
> 
> 3. mc 4.6.1-pre4
> sh = ash
> real    2m13.248s
> user    3m31.685s
> sys     1m9.772s
> 
> sh = bash
> real    2m10.112s
> user    3m30.198s
> sys     1m10.563s

Are you sure you didn't actually measure bash's performance twice?
If you simply run configure with ash, it will effectively do an

    exec /bin/bash "$0" "$@"

at the beginning, unless you force it to stick with ash by setting
CONFIG_SHELL=/bin/sh.

FWIW, I did find that the configure scripts I tested ran faster
under ash than under bash, but only by 4% to 8%.

Regards
Thorsten Dahlheimer

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