From: Jeff King <peff@peff.net>
To: Theodore Tso <tytso@MIT.EDU>
Cc: Nick Edelen <sirnot@gmail.com>, Will Palmer <wmpalmer@gmail.com>,
Avery Pennarun <apenwarr@gmail.com>,
git@vger.kernel.org
Subject: Re: Why is "git tag --contains" so slow?
Date: Thu, 8 Jul 2010 07:31:51 -0400 [thread overview]
Message-ID: <20100708113151.GB2294@sigill.intra.peff.net> (raw)
In-Reply-To: <11D5771D-EB47-42E9-BCC3-69C8FE1999EC@MIT.EDU>
On Thu, Jul 08, 2010 at 06:29:04AM -0400, Theodore Tso wrote:
> On Jul 7, 2010, at 1:45 PM, Jeff King wrote:
>
> > And of course it's just complex, and I tend to shy away from
> > complexity when I can. The question to me comes back to (1) above.
> > Is massive clock skew a breakage that should produce a few
> > incorrect results, or is it something we should always handle?
>
> Going back to the question that kicked off this thread, I wonder if there
> is some way that cacheing could be used to speed up the all cases,
> or at lest the edge cases, without imposing as much latency as tracking
> the max skew? i.e., some thing like gitk's gitk.cache file. For bonus
> points, it could be a cache file that is used by both gitk and git tag
> --contains, git branch --contains, and git name-rev.
>
> Does that sound like reasonable idea?
It sounds reasonable to me. It just needs somebody to design and
implement it. :)
I don't know anything about how gitk.cache works. Caching tag refs is
not that hard, because the refs tend not to change. Doing arbitrary "X
contains Y" caching is much harder, and I think you would have to build
it on Nick's rev-cache work. Maybe he (cc'd) has some ideas.
-Peff
next prev parent reply other threads:[~2010-07-08 11:32 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-01 0:54 Why is "git tag --contains" so slow? Theodore Ts'o
2010-07-01 0:58 ` Shawn O. Pearce
2010-07-03 23:27 ` Sam Vilain
2010-07-01 1:00 ` Avery Pennarun
2010-07-01 12:17 ` tytso
2010-07-01 15:03 ` Jeff King
2010-07-01 15:38 ` Jeff King
2010-07-02 19:26 ` tytso
2010-07-03 8:06 ` Jeff King
2010-07-04 0:55 ` tytso
2010-07-05 12:27 ` Jeff King
2010-07-05 12:33 ` [RFC/PATCH 1/4] tag: speed up --contains calculation Jeff King
2010-10-13 22:07 ` Jonathan Nieder
2010-10-13 22:56 ` Clemens Buchacher
2011-02-23 15:51 ` Ævar Arnfjörð Bjarmason
2011-02-23 16:39 ` Jeff King
2010-07-05 12:34 ` [RFC/PATCH 2/4] limit "contains" traversals based on commit timestamp Jeff King
2010-10-13 23:21 ` Jonathan Nieder
2010-07-05 12:35 ` [RFC/PATCH 3/4] default core.clockskew variable to one day Jeff King
2010-07-05 12:36 ` [RFC/PATCH 4/4] name-rev: respect core.clockskew Jeff King
2010-07-05 12:39 ` Why is "git tag --contains" so slow? Jeff King
2010-10-14 18:59 ` Jonathan Nieder
2010-10-16 14:32 ` Clemens Buchacher
2010-10-27 17:11 ` Jeff King
2010-10-28 8:07 ` Clemens Buchacher
2010-07-05 14:10 ` tytso
2010-07-06 11:58 ` Jeff King
2010-07-06 15:31 ` Will Palmer
2010-07-06 16:53 ` tytso
2010-07-08 11:28 ` Jeff King
2010-07-08 13:21 ` Will Palmer
2010-07-08 13:54 ` tytso
2010-07-07 17:45 ` Jeff King
2010-07-08 10:29 ` Theodore Tso
2010-07-08 11:12 ` Jakub Narebski
2010-07-08 19:29 ` Nicolas Pitre
2010-07-08 19:39 ` Avery Pennarun
2010-07-08 20:13 ` Nicolas Pitre
2010-07-08 21:20 ` Jakub Narebski
2010-07-08 21:30 ` Sverre Rabbelier
2010-07-08 23:10 ` Nicolas Pitre
2010-07-08 23:15 ` Nicolas Pitre
2010-07-08 11:31 ` Jeff King [this message]
2010-07-08 14:35 ` Johan Herland
2010-07-08 19:06 ` Nicolas Pitre
2010-07-07 17:50 ` Jeff King
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