Date: Wed, 2 Apr 2014 12:33:50 -0400 From: Glen Barber <gjb@FreeBSD.org> To: Nikolai Lifanov <lifanov@mail.lifanov.com> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, Brooks Davis <brooks@freebsd.org>, src-committers@freebsd.org Subject: Re: svn commit: r264027 - in head: release share/man/man7 Message-ID: <20140402163350.GI14379@glenbarber.us> In-Reply-To: <533C3992.9030203@mail.lifanov.com> References: <201404012241.s31MfRW6020684@svn.freebsd.org> <20140402154022.GA70867@lor.one-eyed-alien.net> <20140402155134.GG14379@glenbarber.us> <533C32F5.9050809@mail.lifanov.com> <20140402160650.GH14379@glenbarber.us> <533C3992.9030203@mail.lifanov.com>
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--yzvKDKJiLNESc64M Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Apr 02, 2014 at 12:23:46PM -0400, Nikolai Lifanov wrote: > On 04/02/14 12:06, Glen Barber wrote: > > On Wed, Apr 02, 2014 at 11:55:33AM -0400, Nikolai Lifanov wrote: > >> On 04/02/14 11:51, Glen Barber wrote: > >>> On Wed, Apr 02, 2014 at 10:40:22AM -0500, Brooks Davis wrote: > >>>> On Tue, Apr 01, 2014 at 10:41:27PM +0000, Glen Barber wrote: > >>>>> Author: gjb > >>>>> Date: Tue Apr 1 22:41:26 2014 > >>>>> New Revision: 264027 > >>>>> URL: http://svnweb.freebsd.org/changeset/base/264027 > >>>>> > >>>>> Log: > >>>>> Add a new release build variable, WITH_COMPRESSED_IMAGES. > >>>>> =20 > >>>>> When set to a non-empty value, the installation medium is > >>>>> compressed with gzip(1) as part of the 'install' target in > >>>>> the release/ directory. > >>>>> =20 > >>>>> With gzip(1) compression, downloadable image are reduced in > >>>>> size quite significantly. Build test against head@263927 > >>>>> shows the following: > >>>>> =20 > >>>>> bootonly.iso: 64% smaller > >>>>> disc1.iso: 44% smaller > >>>>> memstick.img: 47% smaller > >>>>> mini-memstick.img: 65% smaller > >>>>> dvd1.iso: untested > >>>>> =20 > >>>>> This option is off by default, I would eventually like to > >>>>> turn it on by default, and remove the '-k' flag to gzip(1) > >>>>> so only compressed images are published on FTP. > >>>> > >>>> I'd recommend testing xz compression as well. With UFS images of a = full > >>>> world the savings vs gzip are significant (more than 30% IIRC, but i= t's > >>>> need more than a year since I checked so I'm a bit unsure of the exa= ct > >>>> numbers). > >>>> > >>> > >>> delphij also brought this up. > >>> > >>> I have concerns with xz(1), since there was mention in IRC that Windo= ws > >>> users may have problems decompressing xz-compressed images. So, gzip= (1) > >>> is used because it seems to be the more commonly-supported archive > >>> mechanisms. > >>> > >>> The benefit of xz(1) over gzip(1) was only 50M-ish. > >>> > >>> -rw-r--r-- 1 root wheel 601M Mar 28 20:18 disc1.iso > >>> -rw-r--r-- 1 root wheel 381M Mar 28 20:18 disc1.iso.bz2 > >>> -rw-r--r-- 1 root wheel 392M Mar 28 20:18 disc1.iso.gz > >>> -rw-r--r-- 1 root wheel 348M Mar 28 20:18 disc1.iso.xz > >>> > >>> Glen > >>> > >> > >> How about 7zip (Windows program, not file format)? What would a Windows > >> user use that can decompress gzip and not xz? It was a problem around > >> ~2007, but xz support is no longer rare or exotic. > >> > >=20 > > I don't know, to be honest. I have no Windows machines to test, so > > I can only go by what I am told. > >=20 > > Glen > >=20 >=20 > I just verified it with 7zip for Windows version 9.22. It extracts > .tar.xz archives and decompresses .xz images. >=20 Great, thank you for confirming. So, the question I have now is, considering the time it takes to compress the image with xz(1) compared to gzip(1), is that worth saving the 50MB space? I do not object to using xz(1), but the compression time difference was quite significant. (I do not have numbers off-hand, but can run the compression again.) Glen --yzvKDKJiLNESc64M Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQIcBAEBCAAGBQJTPDvuAAoJELls3eqvi17QM1UP/1Je9M++uGqBmut+6mkMK2SW mickD3VWcx+XYhJ1obj2OlkaIfykbElz++uHlbrVMc5BVHbaV/K5WI1TO95XOdeP U/HlKNYXN+/yxq/bmAiYGl03/Qa9LbvAnd5wwqWQPpU+G2erzSYrz/lvS9Hau6EO ZF897QfAlxOq9lAEVZbIw6RKARFKZ0uUcCnJnrelHRMGg4RqQC6pguUKyA2uZ+QJ 9dS4f3tCF3q0mpBa6KdHzR9LqG8lr68oflTpgOoFp7WUGpoR5aPU01NFvbrZtXjd Zrk7Eds9daf5/W2D7WJtNk+FyauJqGqECtNZyMLXjlA/38kBBy6dI23ThF0pYMK3 J/zUKIfvS4RmUN6JxIZImJSBlUVo61dK8zQ6qJGSvBgZVgFQt8GrgGIJDKRR6roW swy/EzH0k/GlN7BVLkTi3os11p7Zz1+oxC8UnIQUq/WBUkj863Jzx8SwDGgvzqiw wWV+uwVPbKKC61gGHvuUGJiDf+dA6ZRob1SVHLoa4w3H6x0u7PnOShNpsRYCBkeg 3HRRX+U0/BkrIJhuVrRHSrm7zmivzfkPwqGytGHFdyUcPMEbJ/Z7CI8YI/jMbxNy kOysZKzwe6pkmbx9Ri8yY0j7MOYMvdVl6t1yLllitJCvZUoYGac883lWmbSM8bP+ d70lJSV1FQASKRVKrmjN =t7oh -----END PGP SIGNATURE----- --yzvKDKJiLNESc64M--
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