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From: "Shawn O. Pearce" <spearce@spearce.org>
To: Junio C Hamano <gitster@pobox.com>
Cc: Nicolas Pitre <nico@cam.org>, Nix <nix@esperi.org.uk>,
	Steven Grimm <koreth@midwinter.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Git Mailing List <git@vger.kernel.org>
Subject: Re: People unaware of the importance of "git gc"?
Date: Wed, 5 Sep 2007 22:45:55 -0400	[thread overview]
Message-ID: <20070906024555.GJ18160@spearce.org> (raw)
In-Reply-To: <7vr6lcj2zi.fsf@gitster.siamese.dyndns.org>

Junio C Hamano <gitster@pobox.com> wrote:
> Implement git gc --auto
... 

Danger...  If the user sets `gc.auto` to a low enough value and
they are also unlucky enough to have a few truely unreachable (thus
pruneable) objects in .git/objects/17/ then this is going to run
a bunch of gc work on every commit they make.

I'm actually running into this problem in git-gui.  On Windows
it suggests a repack if there is one object in .git/objects/42/.
Some users have been unlucky enough to stage a file, have it
hash into that directory, then restage a different version of it.
The prior one is never considered reachable (it was never committed),
but will now *always* cause git-gui to suggest a repack on every
startup.  For all time.

Yea, I need to fix that.

But this suffers from the same fate if the user sets gc.auto too
small and doesn't realize that the reason Git is always repacking
is because over the last 6 months they have been unlucky enough to
stage the magic number of unreachable blobs into the 17 directory
and they have *never* run `git gc --prune` because the auto thing
is working just fine for them and they don't realize they need to
prune every once in a blue moon.

-- 
Shawn.

  parent reply	other threads:[~2007-09-06  2:46 UTC|newest]

Thread overview: 97+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-09-05  7:09 People unaware of the importance of "git gc"? Linus Torvalds
2007-09-05  7:21 ` Martin Langhoff
2007-09-05  7:37   ` Karl Hasselström
2007-09-05  7:30 ` Junio C Hamano
2007-09-05  7:26   ` Tomash Brechko
2007-09-05  8:13   ` Johan Herland
2007-09-05  8:39     ` Matthieu Moy
2007-09-05  8:41       ` Johan Herland
2007-09-05  8:47         ` David Kastrup
2007-09-05  8:51       ` Pierre Habouzit
2007-09-05  9:02         ` David Kastrup
2007-09-05  9:04         ` Matthieu Moy
2007-09-05  8:51   ` Wincent Colaiuta
2007-09-05  7:42 ` Pierre Habouzit
2007-09-05  8:16   ` Junio C Hamano
2007-09-05  8:50   ` Steven Grimm
     [not found]     ` <86ps0xcwxo.fsf@lola.quinscape.zz>
2007-09-05  9:07       ` Steven Grimm
2007-09-05  9:13         ` David Kastrup
2007-09-05  9:07     ` Junio C Hamano
2007-09-05  9:27       ` Martin Langhoff
2007-09-05  9:33         ` Matthieu Moy
2007-09-05 14:17           ` Johan De Messemaeker
2007-09-05 17:31             ` Matthieu Moy
2007-09-05 23:56               ` Jeff King
2007-09-05  9:13     ` David Kastrup
2007-09-05  9:14     ` Pierre Habouzit
2007-09-05 17:51   ` Nix
2007-09-05 18:14     ` Steven Grimm
2007-09-05 18:22       ` Nix
2007-09-05 18:54         ` Nicolas Pitre
2007-09-05 20:01           ` Junio C Hamano
2007-09-05 20:35             ` Nicolas Pitre
2007-09-05 21:14               ` Nix
2007-09-05 21:46               ` Junio C Hamano
2007-09-05 23:04                 ` Nicolas Pitre
2007-09-05 23:42                   ` Junio C Hamano
2007-09-06  0:27                     ` Carlos Rica
2007-09-06  5:55                 ` David Kastrup
2007-09-05 21:49               ` Junio C Hamano
2007-09-05 21:59                 ` Invoke "git gc --auto" from commit, merge, am and rebase Junio C Hamano
2007-09-06  2:39                   ` Shawn O. Pearce
2007-09-05 20:37             ` [PATCH] Invoke "git gc --auto" from "git add" and "git fetch" Junio C Hamano
     [not found]               ` <69b0c0350709051357ifa547aarfe3e0b36cf9be98f@mail.gmail.com>
2007-09-05 20:59                 ` Fwd: " Govind Salinas
2007-09-06 12:02               ` Johannes Schindelin
2007-09-05 21:18             ` People unaware of the importance of "git gc"? Alex Riesen
2007-09-06  2:44             ` Russ Dill
2007-09-06  2:52               ` Shawn O. Pearce
2007-09-06  9:28               ` Andreas Ericsson
2007-09-06  2:45             ` Shawn O. Pearce [this message]
2007-09-06  2:49               ` Steven Grimm
2007-09-06  2:56                 ` Shawn O. Pearce
2007-09-06 15:54             ` Johannes Schindelin
2007-09-06 17:49               ` Junio C Hamano
2007-09-06 18:15                 ` Linus Torvalds
2007-09-06 18:29                   ` Steven Grimm
2007-09-06 23:12                   ` Subject: [PATCH] git-merge-pack Junio C Hamano
2007-09-06 23:35                     ` Linus Torvalds
2007-09-07  0:51                     ` Nicolas Pitre
2007-09-07  1:58                       ` Junio C Hamano
2007-09-07  2:32                         ` Nicolas Pitre
2007-09-07  4:07                       ` Shawn O. Pearce
2007-09-07  4:43                       ` Junio C Hamano
2007-09-08  9:50                         ` [PATCH] make sha1_file.c::matches_pack_name() available to others Junio C Hamano
2007-09-08 10:01                         ` [PATCH] pack-objects --repack-unpacked Junio C Hamano
2007-09-07  7:11                     ` Subject: [PATCH] git-merge-pack Johannes Sixt
2007-09-07  7:34                       ` Junio C Hamano
2007-09-07  7:24                     ` Andy Parkins
2007-09-07  4:48                 ` People unaware of the importance of "git gc"? Shawn O. Pearce
2007-09-07 10:12                 ` Johannes Schindelin
2018-10-07 18:28           ` What's so special about objects/17/ ? Ævar Arnfjörð Bjarmason
2018-10-07 18:35             ` Johannes Sixt
2018-10-07 19:06               ` Ævar Arnfjörð Bjarmason
2018-10-07 22:39                 ` Johannes Sixt
2018-10-08  0:54                   ` Junio C Hamano
2018-10-07 19:46             ` Junio C Hamano
2018-10-07 20:07               ` Junio C Hamano
2018-10-08 19:17                 ` Stefan Beller
2018-10-09  1:03                   ` Junio C Hamano
2018-10-09 17:37                     ` Stefan Beller
2018-10-10  1:10                       ` Junio C Hamano
2018-10-10 19:08                         ` Stefan Beller
2018-10-08 10:36               ` Ævar Arnfjörð Bjarmason
2018-10-09  1:07                 ` Junio C Hamano
2018-10-09 17:40                   ` Stefan Beller
2007-09-05  8:16 ` People unaware of the importance of "git gc"? David Kastrup
2007-09-05 16:47 ` Govind Salinas
2007-09-05 17:19   ` Carl Worth
2007-09-05 17:55     ` Jing Xue
2007-09-05 17:35   ` Steven Grimm
2007-09-05 18:28     ` Nix
2007-09-05 17:44 ` J. Bruce Fields
2007-09-05 18:46   ` Brandon Casey
2007-09-05 19:09     ` David Kastrup
2007-09-05 19:13       ` J. Bruce Fields
2007-09-05 19:43         ` David Kastrup
2007-09-05 19:20       ` Mike Hommey
2007-09-05 21:07 ` Alex Riesen

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