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From: Jeff King <peff@peff.net>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>,
	"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
Subject: [RFC/PATCH 0/5] generation numbers for faster traversals
Date: Mon, 11 Jul 2011 12:13:32 -0400	[thread overview]
Message-ID: <20110711161332.GA10057@sigill.intra.peff.net> (raw)

So here's my series for using cached generations with "tag --contains".
I already posted some numbers here:

  http://article.gmane.org/gmane.comp.version-control.git/176807

But to recap, this seems to be about as fast as limiting by timestamp,
but without the skew issues. It uses 24 bytes per commit of disk
storage for the cache (about 6 megabytes for linux-2.6).

If we like this approach, we could do something similar for "branch
--contains", and possibly move "name-rev" to use generations instead of
timestamps with a timestamp slop.

These patches are built on top of ffc4b80 (tag: speed up --contains
calculation, 2011-06-11), the first commit from jk/tag-contains-ab.

  [1/5]: decorate: allow storing values instead of pointers
  [2/5]: add object-cache infrastructure
  [3/5]: commit: add commit_generation function
  [4/5]: pretty: support %G to show the generation number of a commit
  [5/5]: limit "contains" traversals based on commit generation

-Peff

             reply	other threads:[~2011-07-11 16:13 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-11 16:13 Jeff King [this message]
2011-07-11 16:16 ` [PATCH 1/5] decorate: allow storing values instead of pointers Jeff King
2011-07-11 16:39   ` Jeff King
2011-07-11 19:06   ` Junio C Hamano
2011-07-11 21:20     ` Jeff King
2011-07-11 16:17 ` [PATCH 2/5] add object-cache infrastructure Jeff King
2011-07-11 16:46   ` Jeff King
2011-07-11 16:58     ` Shawn Pearce
2011-07-11 19:17   ` Junio C Hamano
2011-07-11 22:01     ` Jeff King
2011-07-11 23:21       ` Junio C Hamano
2011-07-11 23:42         ` Junio C Hamano
2011-07-12  0:03         ` Jeff King
2011-07-12 19:38           ` Clemens Buchacher
2011-07-12 19:45             ` Jeff King
2011-07-12 21:07               ` Clemens Buchacher
2011-07-12 21:15                 ` Clemens Buchacher
2011-07-12 21:36                 ` Jeff King
2011-07-14  8:04                   ` Clemens Buchacher
2011-07-14 16:26                     ` Illia Bobyr
2011-07-13  1:33                 ` John Szakmeister
2011-07-12  0:14         ` Illia Bobyr
2011-07-12  5:35           ` Jeff King
2011-07-12 21:52             ` Illia Bobyr
2011-07-12  6:36       ` Miles Bader
2011-07-12 10:41   ` Jakub Narebski
2011-07-12 17:57     ` Jeff King
2011-07-12 18:41       ` Junio C Hamano
2011-07-13  6:37         ` Jeff King
2011-07-13 17:49           ` Junio C Hamano
2011-07-11 16:18 ` [PATCH 3/5] commit: add commit_generation function Jeff King
2011-07-11 17:57   ` Clemens Buchacher
2011-07-11 21:10     ` Jeff King
2011-07-11 16:18 ` [PATCH 4/5] pretty: support %G to show the generation number of a commit Jeff King
2011-07-11 16:18 ` [PATCH 5/5] limit "contains" traversals based on commit generation Jeff King

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