From: Derrick Stolee <stolee@gmail.com>
To: Jeff King <peff@peff.net>, git@vger.kernel.org
Cc: Christian Couder <chriscool@tuxfamily.org>,
Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH 0/3] delta-island fixes
Date: Tue, 20 Nov 2018 10:06:57 -0500 [thread overview]
Message-ID: <778f1fcb-8988-de42-8264-d4394ede8540@gmail.com> (raw)
In-Reply-To: <20181120094451.GA21725@sigill.intra.peff.net>
On 11/20/2018 4:44 AM, Jeff King wrote:
> In cases like this I think it's often a good idea to have a perf test.
> Those are expensive anyway, and we'd have the double benefit of
> exercising the code and showing off the performance improvement. But the
> delta-island code only makes sense on a very specialized repo: one where
> you have multiple related but diverging histories. You could simulate
> that by picking two branches in a repository, but the effect is going to
> be miniscule.
The changes in this series look correct. Too bad it is difficult to test.
Perhaps we should add a performance test for the --delta-islands check
that would trigger the failure (and maybe a clone afterwards). There are
lots of freely available forks of git.git that present interesting fork
structure. Here are three that would suffice to make this interesting:
https://github.com/git/git
https://github.com/git-for-windows/git
https://github.com/microsoft/git
Of course, running it on a specific repo is up to the person running the
perf suite.
Thanks,
-Stolee
next prev parent reply other threads:[~2018-11-20 15:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-20 9:44 [PATCH 0/3] delta-island fixes Jeff King
2018-11-20 9:46 ` [PATCH 1/3] pack-objects: fix tree_depth and layer invariants Jeff King
2018-11-20 16:37 ` Duy Nguyen
2018-11-22 16:50 ` Jeff King
2018-11-21 4:52 ` Junio C Hamano
2018-11-20 9:48 ` [PATCH 2/3] pack-objects: zero-initialize tree_depth/layer arrays Jeff King
2018-11-20 9:50 ` [PATCH 3/3] pack-objects: fix off-by-one in delta-island tree-depth computation Jeff King
2018-11-20 15:06 ` Derrick Stolee [this message]
2018-11-22 16:43 ` [PATCH 0/3] delta-island fixes Jeff King
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