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From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: "Jakub Narebski" <jnareb@gmail.com>, "Ted Ts'o" <tytso@mit.edu>,
	"Jonathan Nieder" <jrnieder@gmail.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
	"Clemens Buchacher" <drizzd@aon.at>,
	git@vger.kernel.org, "Junio C Hamano" <gitster@pobox.com>
Subject: Re: generation numbers
Date: Thu, 07 Jul 2011 12:34:37 -0700	[thread overview]
Message-ID: <7vliw9hoky.fsf@alter.siamese.dyndns.org> (raw)
In-Reply-To: <20110707185908.GB12044@sigill.intra.peff.net> (Jeff King's message of "Thu, 7 Jul 2011 14:59:08 -0400")

Jeff King <peff@peff.net> writes:

> You could "cheat" and instead of storing the sha1 of a blob object in
> the notes tree, use the lower 32 bits to store an actual value. I don't
> think that currently breaks any assumptions in the notes code, but it
> definitely is against the intent of it.

I highly suspect that it would break fsck rather badly.  You may not even
be able to repack a repository with such a notes tree.

> For a local lookup cache, I would use a fixed-size binary integer just
> to keep the lookup data structure simple (then you know the width of
> each record ahead of time). For a generation commit header, obviously we
> would go with the ascii representation as we do for other headers.

Yes.

  reply	other threads:[~2011-07-07 19:34 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-11 19:04 [PATCH 0/4] Speed up git tag --contains Ævar Arnfjörð Bjarmason
2011-06-11 19:04 ` [PATCH 1/4] tag: speed up --contains calculation Ævar Arnfjörð Bjarmason
2011-06-11 19:04 ` [PATCH 2/4] limit "contains" traversals based on commit timestamp Ævar Arnfjörð Bjarmason
2011-06-11 19:04 ` [PATCH 3/4] default core.clockskew variable to one day Ævar Arnfjörð Bjarmason
2011-06-11 19:04 ` [PATCH 4/4] Why is "git tag --contains" so slow? Ævar Arnfjörð Bjarmason
2011-07-06  6:40 ` [PATCH 0/4] Speed up git tag --contains Jeff King
2011-07-06  6:54   ` Jeff King
2011-07-06 19:06     ` Clemens Buchacher
2011-07-06  6:56   ` Jonathan Nieder
2011-07-06  7:03     ` Jeff King
2011-07-06 14:26       ` generation numbers (was: [PATCH 0/4] Speed up git tag --contains) Jakub Narebski
2011-07-06 15:01         ` Ted Ts'o
2011-07-06 18:12           ` Jeff King
2011-07-06 18:46             ` Jakub Narebski
2011-07-07 18:59               ` Jeff King
2011-07-07 19:34                 ` Junio C Hamano [this message]
2011-07-07 20:31                   ` generation numbers Jakub Narebski
2011-07-07 20:52                     ` A Large Angry SCM
2011-07-08  0:29                       ` Junio C Hamano
2011-07-08 22:57                   ` Jeff King
2011-07-06 23:22             ` Junio C Hamano
2011-07-07 19:08               ` Jeff King
2011-07-07 20:10                 ` Jakub Narebski
2018-01-12 18:56   ` [PATCH 0/4] Speed up git tag --contains csilvers
2018-03-03  5:15     ` Jeff King
2018-03-08 23:05       ` csilvers
2018-03-12 13:45       ` Derrick Stolee
2018-03-12 23:59         ` Jeff King

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