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From: Derrick Stolee <stolee@gmail.com>
To: Jeff King <peff@peff.net>
Cc: Constantine <hi-angel@yandex.ru>,
	Junio C Hamano <gitster@pobox.com>,
	Christian Couder <christian.couder@gmail.com>,
	Mike Hommey <mh@glandium.org>, git <git@vger.kernel.org>
Subject: Re: git-clone causes out of memory
Date: Fri, 13 Oct 2017 10:30:48 -0400
Message-ID: <c4b88c7e-7be3-6acb-71f9-fb0185dc0b7d@gmail.com> (raw)
In-Reply-To: <20171013142646.evapso5uxzvh2r2p@sigill.intra.peff.net>

On 10/13/2017 10:26 AM, Jeff King wrote:
> On Fri, Oct 13, 2017 at 10:25:10AM -0400, Derrick Stolee wrote:
>
>> This does appear to be the problem. The missing DIFF_OPT_HAS_CHANGES is
>> causing diff_can_quit_early() to return false. Due to the corner-case of the
>> bug it seems it will not be a huge performance improvement in most cases.
>> Still worth fixing and I'm looking at your suggestions to try and learn this
>> area better.
> Yeah, I just timed some pathspec limits on linux.git, and it makes at
> best a fraction of a percent improvement (but any improvement is well
> within run-to-run noise). Which is not surprising.
>
> I agree it's worth fixing, though.
>
> -Peff

I just ran a first-level folder history in the Windows repository and 
`git rev-list HEAD -- windows >/dev/null` went from 0.43s to 0.04s. So, 
a good percentage improvement but even on this enormous repo the bug 
doesn't present an issue to human users.

Thanks,
-Stolee

  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-13  9:51 Constantine
2017-10-13 10:06 ` Mike Hommey
2017-10-13 10:26   ` Christian Couder
2017-10-13 10:37     ` Mike Hommey
2017-10-13 10:44       ` Christian Couder
2017-10-13 12:04         ` Junio C Hamano
2017-10-13 12:12           ` Constantine
2017-10-13 12:44             ` Jeff King
2017-10-13 13:15               ` Derrick Stolee
2017-10-13 13:39                 ` Derrick Stolee
2017-10-13 13:50                   ` Jeff King
2017-10-13 13:55                     ` Derrick Stolee
2017-10-13 13:56                       ` Jeff King
2017-10-13 14:10                         ` Jeff King
2017-10-13 14:20                           ` Jeff King
2017-10-13 14:25                             ` Derrick Stolee
2017-10-13 14:26                               ` Jeff King
2017-10-13 14:30                                 ` Derrick Stolee [this message]
2017-10-13 15:27                                 ` [PATCH] revision: quit pruning diff more quickly when possible Jeff King
2017-10-13 15:37                                   ` Derrick Stolee
2017-10-13 15:44                                     ` Jeff King
2017-10-14  2:43                                   ` Junio C Hamano
2017-10-13 12:35   ` git-clone causes out of memory Jeff King

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