linux-kernel - Re: In response to kernel compression e-mail a few months ago.

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Message-Id: <200710161419.07975.vda.linux@googlemail.com>
Date:	Tue, 16 Oct 2007 14:19:07 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	Al Viro <viro@....linux.org.uk>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	linux-kernel@...r.kernel.org, apiszcz@...arrain.com
Subject: Re: In response to kernel compression e-mail a few months ago.

On Sunday 14 October 2007 21:58, Justin Piszcz wrote:
> 
> On Sun, 14 Oct 2007, Al Viro wrote:
> 
> > On Sun, Oct 14, 2007 at 09:46:15PM +0200, Jan Engelhardt wrote:
> >> (Obviously we shall pick .7z)
> >
> > The hell it is.  Take a look at memory footprint of those suckers...
> 
> For compression with -mx=9 it does use 500-900 MiB of RAM, that is true.
> For decompression, 50-70 MiB.

I'm with Al on this. 50 Mb for decompression?
Embedded and small device folks will not love this, I'm sure.
*Maybe* we can use lzma. Seems to use 8Mb on decompression:

  PID   VSZ*VSZRW   RSS (SHR) DIRTY (SHR) STACK COMMAND
30474 10708  8604  8760   392  8360     0     8 lzmacat pld-th-x86_64.tar.lzma

(pld-th-x86_64.tar.lzma is a random 40Mb .lzma file I found on the net)

Sizes in Kb again:

32392 linux-2.6.16.17.tar.7z
33520 linux-2.6.16.17.tar.lzma

P.S. sorting files by extension in tarball generally helps, but in case
of Linux kernel, they are all C code anyway, so no measurable gain there.
--
vda
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