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To: gentoo-dev@g.o
From: Zac Medico <zmedico@g.o>
Subject: Re: metadata/md5-cache
Date: Sat, 02 Jun 2012 17:54:15 -0700
On 06/02/2012 05:32 PM, James Cloos wrote:
> What's up with md5-cache?
> 
> Every syn has to pull the entire md5-cache hierarchy over again, as if
> some daemon re-creates every file every day, rather than only re-writing
> those files which need updates and adding/removing those which need that.

We had a bug about that [1] when we first deployed md5-cache, but it's
supposed to have been fixed.

> Even if only the files metatdata changes, that still adds a significant
> cost to an rsync.
> 
> It is important that md5-cache files which do not require change be left
> alone.

There's code in portage to avoid redundant cache writes [2]. Eclass
modifications can still trigger lots of cache changes though, especially
eutils.eclass (which most ebuilds inherit).

> Not everyone has gobs of network bandwidth available.
> 
> -JimC

[1] https://bugs.gentoo.org/show_bug.cgi?id=410505
[2]
http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=0e120da008c9d0d41c9372c81145c6e153028a6d
-- 
Thanks,
Zac


Replies:
Re: metadata/md5-cache
-- James Cloos
References:
metadata/md5-cache
-- James Cloos
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Updated Jun 29, 2012

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