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Date: Wed, 25 Feb 2009 15:30:23 +0000
From: Ciaran McCreesh <ciaran.mccreesh@googlemail.com>
To: gentoo-dev@lists.gentoo.org
Subject: Re: [gentoo-dev] Issues regarding glep-55 (Was: [gentoo-council]
Re: Preliminary Meeting-Topics for 12 February 2009)
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On Wed, 25 Feb 2009 09:33:44 +0100
Alexis Ballier <aballier@gentoo.org> wrote:
> That sounds like an implementation detail that you could solve by
> using something else than a flat file database for metadata if
> open()/read() calls are the slow part.
Metadata's shipped with the tree. It's a PMS detail.
If we didn't care about package manager performance, we wouldn't be
shipping metadata with the tree at all...
> > > I would be very surprised if that "2 times" factor happens to be
> > > true, because finding a string in a file is an order of magnitude
> > > simpler than sourcing said file with bash. Moreover this doesn't
> > > take into account disk and os cache.
> >=20
> > No no no. *Opening* the file is the slow part, not searching. The
> > file wouldn't otherwise be opened at all.
>=20
> Thus the only drawback is when you open a file, see there that you
> can't handle the eapi, then close it and open an older one.
Uh. No. The drawback is that you're opening around ten thousand files
that would otherwise not be opened. That's a huge cost.
--=20
Ciaran McCreesh
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