Date: Thu, 14 Nov 2002 14:57:39 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: sobomax@FreeBSD.ORG, silby@silby.com, njl@FreeBSD.ORG, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/bin/sleep sleep.c Message-ID: <200211142257.gAEMvdxX071776@apollo.backplane.com> References: <200211132012.gADKCQxr062768@repoman.freebsd.org> <Pine.BSF.4.44.0211131528010.32919-100000@niwun.pair.com> <20021113204503.GI9006@vega.vega.com> <20021113.215346.90827277.imp@bsdimp.com>
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I think the real issue is the bloat in libc. printf() eats 20K, basic
stdio eats 5K. You get 15K of bloat just with a blank main(), a good
chunk of that being malloc() (reasonable in larger programs, ridiculous
in tiny programs where you don't care about malloc() efficiency).
(static link output)
-rwxr-xr-x 1 dillon dillon 52873 Nov 14 14:36 x printf("X\n");
-rwxr-xr-x 1 dillon dillon 21493 Nov 14 14:36 x puts("X");
-rwxr-xr-x 1 dillon dillon 21493 Nov 14 14:36 x puts("X");
-rwxr-xr-x 1 dillon dillon 15109 Nov 14 14:38 x main()
-rwxr-xr-x 1 dillon dillon 959 Nov 14 14:55 x _start() / no libc
-rwxr-xr-x 1 dillon dillon 959 Nov 14 14:55 x _start() + phk malloc
-rwxr-xr-x 1 dillon dillon 13409 Nov 14 14:56 x
My zalloc implementation, which I could turn into a poor-man's malloc
in 10 seconds (and is used in libstand) eats 1.7K. My *printf()
core (pfmt) from DICE, which handles 95% of the capabilities of *printf,
is 1.9K. I could adapt the stdio library from DICE to fit in probably
less then 2K, assuming one actually referenced every single function.
Why not create a mini-libc? No language-aware character conversions,
no efficient string or memory functions, no floating point. Just a basic
implementation of the core functionality required for stdio, malloc,
*printf(), string functions, and system calls (which will simply be
borrowed from libc), sufficient for simple binaries. It could be made
compatible with our standard includes (structural bloat != code bloat,
so who cares).
I could whip this up in a day or two. I'm not kidding. I already have
most of the necessary pieces from my embedded libraries and DICE
libraries.
-Matt
Matthew Dillon
<dillon@backplane.com>
:
:In message: <20021113204503.GI9006@vega.vega.com>
: Maxim Sobolev <sobomax@FreeBSD.org> writes:
:: On Wed, Nov 13, 2002 at 03:32:13PM -0500, Mike Silbersack wrote:
:: >
:: > On Wed, 13 Nov 2002, Nate Lawson wrote:
:: >
:: > > njl 2002/11/13 12:12:26 PST
:: > >
:: > > Modified files:
:: > > bin/sleep sleep.c
:: > > Log:
:: > > Remove getopt and strtol dependencies, reducing size of static exe.
:: > > Preserve older desired behavior, accept [+-]*[0-9]*\.[0-9]*
:: > > Remove a few unnecessary casts.
:: >
:: > Please don't commit crap like this. While having smaller binaries might
:: > be nice, being entered into an obfuscated C contest is not one of the
:: > goals of FreeBSD.
::
:: I fully agree - HDD space is pretty cheap today, while embedded folks
:: should use other means to reduce footprint (e.g crunchgen). Actually
:: in the case of crunchgen this commit worsens situation, as the code
:: is no longer shared.
:
:It also makes the dynamic binary larger for the folks that have / and
:/usr on the same partition and dynamically link /sbin and /bin. Much
:more bang for the buck that these silly micro-optimizations. So this
:is a negative thing as far as I'm concerned. :-(
:
:Warner
:
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