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From: Taylor Blau <me@ttaylorr.com>
To: "SZEDER Gábor" <szeder.dev@gmail.com>
Cc: Jeff King <peff@peff.net>, Taylor Blau <me@ttaylorr.com>,
	git@vger.kernel.org, dstolee@microsoft.com
Subject: Re: [PATCH 1/1] commit-graph.c: avoid unnecessary tag dereference when merging
Date: Mon, 23 Mar 2020 14:15:25 -0600	[thread overview]
Message-ID: <20200323201525.GA98905@syl.local> (raw)
In-Reply-To: <20200322110424.GC2224@szeder.dev>

On Sun, Mar 22, 2020 at 12:04:24PM +0100, SZEDER Gábor wrote:
> On Sun, Mar 22, 2020 at 01:36:35AM -0400, Jeff King wrote:
> > The "--input=none" option
> > isn't "no input"; it's actually "take all existing graphed objects as
> > input" (i.e., it implies --append). So each of those objects will
> > already have been examined in an earlier stage.
>
> Yeah, we discussed it earlier that '--input=none' doesn't properly
> describe what it tries to accomplish, and suggested '--input=exists'
> (or was it 'existing'?) instead.

Good idea. I don't remember discussing '--input=exist{s,ing}',
specifically, but I do think that '--input=none' is not as clear as it
could be.

I sent [1], which I think may be a step in the right direction. I'll
look forward to your thoughts.

> > > Where the last step is taking all commits listed in any pack, which is
> > > cheap to iterate.
> >
> > I'm not sure it's all that cheap. It has to find the type of every
> > object in every pack. And finding types involves walking delta chains.
>
> Indeed, that's just about the most expensive way to find all commits,
> in my experience it can be well over a magnitude slower than
> '--reachable'.

Thanks,
Taylor

[1]: https://lore.kernel.org/git/e0f42a2f3c0162a5d43bb2bce0f69264b59f92e9.1584994172.git.me@ttaylorr.com/

  parent reply	other threads:[~2020-03-23 20:15 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-21  3:44 [PATCH 0/1] commit-graph: avoid unnecessary tag deference when merging Taylor Blau
2020-03-21  3:44 ` [PATCH 1/1] commit-graph.c: avoid unnecessary tag dereference " Taylor Blau
2020-03-21  5:00   ` Jeff King
2020-03-21  6:11     ` Taylor Blau
2020-03-21  6:24       ` Taylor Blau
2020-03-21  7:03       ` Jeff King
2020-03-21 17:27         ` Taylor Blau
2020-03-22  5:36           ` Jeff King
2020-03-22 11:04             ` SZEDER Gábor
2020-03-22 18:45               ` looking up object types quickly, was " Jeff King
2020-03-22 19:18                 ` Jeff King
2020-03-23 20:15               ` Taylor Blau [this message]
2020-03-22 16:45             ` Taylor Blau
2020-03-24  6:06               ` Jeff King
2020-03-21 18:50         ` Junio C Hamano
2020-03-22  0:03           ` Derrick Stolee
2020-03-22  0:20             ` Taylor Blau
2020-03-22  0:23               ` Derrick Stolee
2020-03-22  5:49                 ` Jeff King
2020-03-22  6:04                   ` Jeff King
2020-03-22 15:47                     ` Taylor Blau
2020-03-24  6:11                       ` Jeff King
2020-03-24 23:08                         ` Taylor Blau
2020-03-27  8:42                           ` Jeff King
2020-03-27 15:03                             ` Taylor Blau
2020-03-22 15:44                   ` Taylor Blau
2020-03-24  6:14                     ` Jeff King
2020-03-21  5:01   ` Junio C Hamano
2020-03-21  4:56 ` [PATCH 0/1] commit-graph: avoid unnecessary tag deference " Junio C Hamano
2020-03-21  5:04   ` Jeff King
2020-03-21  6:12     ` Taylor Blau

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