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From: Martin Fick <mfick@codeaurora.org>
To: Taylor Blau <me@ttaylorr.com>
Cc: Jeff King <peff@peff.net>, Junio C Hamano <gitster@pobox.com>,
	git@vger.kernel.org, dstolee@microsoft.com
Subject: Re: [PATCH v4 0/8] repack: support repacking into a geometric sequence
Date: Tue, 23 Feb 2021 14:57:25 -0700	[thread overview]
Message-ID: <2190798.zr6bNypoxz@mfick-lnx> (raw)
In-Reply-To: <YDVgPtkaTb9zNq0/@nand.local>

On Tuesday, February 23, 2021 3:06:22 PM MST Taylor Blau wrote:
> On Tue, Feb 23, 2021 at 12:54:56PM -0700, Martin Fick wrote:
> > Would it make sense to somehow detect all new packs since the last rollup
> > and always include them in the rollup no matter what their size? That is
> > one thing that my git-exproll script did.
> 
> I'm certainly not opposed, and this could certainly be done in an
> additive way (i.e., after this series). I think the current approach has
> nice properties, but I could also see "roll-up all packs that have
> mtimes after xyz timestamp" being useful.

Just to be clear, I meant to combine the two approaches. And yes, my 
suggestion would likely make more sense as an additive switch later on.
 
> It would even be possible to reuse a lot of the geometric repack
> machinery. Having a separate path to arrange packs by their mtimes and
> determine the "split" at pack whose mtime is nearest the provided one
> would do exactly what you want.

I was thinking to keep all of your geometric repack machinery and only looking 
for the split point starting at the right most pack which is newer than the 
provided mtime, and then possibly enhancing the approach with a clever way to 
use the mtime of the last consolidation (maybe by touching a pack/.geometric 
file?).

> (As a side-note, reading the original threads about your git-exproll was
> quite humbling, since it turns out all of the problems I thought were
> hard had already been discussed eight years ago!)

Thanks, but I think you have likely done a much better job than what I did. 
Your approach of using object counts is likely much better as it should be 
stable, using byte counts is not. You are also solving only one problem at a 
time, that's probably better than my hodge-podge of at least 3 different 
problems. And the most important part of your approach as I understand it, is 
that it actually saves CPU time whereas my approach only saved IO.

Cheers,

-Martin

-- 
The Qualcomm Innovation Center, Inc. is a member of Code 
Aurora Forum, hosted by The Linux Foundation


  reply	other threads:[~2021-02-23 21:59 UTC|newest]

Thread overview: 120+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-19 23:23 [PATCH 00/10] repack: support repacking into a geometric sequence Taylor Blau
2021-01-19 23:24 ` [PATCH 01/10] packfile: introduce 'find_kept_pack_entry()' Taylor Blau
2021-01-20 13:40   ` Derrick Stolee
2021-01-20 14:38     ` Taylor Blau
2021-01-29  2:33   ` Junio C Hamano
2021-01-29 18:38     ` Taylor Blau
2021-01-29 19:31     ` Jeff King
2021-01-29 20:20       ` Junio C Hamano
2021-01-19 23:24 ` [PATCH 02/10] revision: learn '--no-kept-objects' Taylor Blau
2021-01-29  3:10   ` Junio C Hamano
2021-01-29 19:13     ` Taylor Blau
2021-01-19 23:24 ` [PATCH 03/10] builtin/pack-objects.c: learn '--assume-kept-packs-closed' Taylor Blau
2021-01-29  3:21   ` Junio C Hamano
2021-01-29 19:19     ` Jeff King
2021-01-29 20:01       ` Taylor Blau
2021-01-29 20:25         ` Jeff King
2021-01-29 22:10           ` Taylor Blau
2021-01-29 22:57             ` Jeff King
2021-01-29 23:03             ` Junio C Hamano
2021-01-29 23:28               ` Taylor Blau
2021-02-02  3:04                 ` Taylor Blau
2021-01-29 23:31               ` Jeff King
2021-01-29 22:13           ` Junio C Hamano
2021-01-29 20:30       ` Junio C Hamano
2021-01-29 22:43         ` Jeff King
2021-01-29 22:53           ` Taylor Blau
2021-01-29 23:00             ` Jeff King
2021-01-29 23:10             ` Junio C Hamano
2021-01-19 23:24 ` [PATCH 04/10] p5303: add missing &&-chains Taylor Blau
2021-01-19 23:24 ` [PATCH 05/10] p5303: measure time to repack with keep Taylor Blau
2021-01-29  3:40   ` Junio C Hamano
2021-01-29 19:32     ` Jeff King
2021-01-29 20:04       ` [PATCH] p5303: avoid sed GNU-ism Jeff King
2021-01-29 20:19         ` Eric Sunshine
2021-01-29 20:27           ` Jeff King
2021-01-29 20:36             ` Eric Sunshine
2021-01-29 22:11               ` Taylor Blau
2021-01-29 20:38       ` [PATCH 05/10] p5303: measure time to repack with keep Junio C Hamano
2021-01-29 22:10         ` Jeff King
2021-01-29 23:12           ` Junio C Hamano
2021-01-19 23:24 ` [PATCH 06/10] pack-objects: rewrite honor-pack-keep logic Taylor Blau
2021-01-19 23:24 ` [PATCH 07/10] packfile: add kept-pack cache for find_kept_pack_entry() Taylor Blau
2021-01-19 23:24 ` [PATCH 08/10] builtin/pack-objects.c: teach '--keep-pack-stdin' Taylor Blau
2021-01-19 23:24 ` [PATCH 09/10] builtin/repack.c: extract loose object handling Taylor Blau
2021-01-20 13:59   ` Derrick Stolee
2021-01-20 14:34     ` Taylor Blau
2021-01-20 15:51       ` Derrick Stolee
2021-01-21  3:45     ` Junio C Hamano
2021-01-19 23:24 ` [PATCH 10/10] builtin/repack.c: add '--geometric' option Taylor Blau
2021-01-20 14:05 ` [PATCH 00/10] repack: support repacking into a geometric sequence Derrick Stolee
2021-02-04  3:58 ` [PATCH v2 0/8] " Taylor Blau
2021-02-04  3:58   ` [PATCH v2 1/8] packfile: introduce 'find_kept_pack_entry()' Taylor Blau
2021-02-16 21:42     ` Jeff King
2021-02-16 21:48       ` Taylor Blau
2021-02-04  3:58   ` [PATCH v2 2/8] revision: learn '--no-kept-objects' Taylor Blau
2021-02-16 23:17     ` Jeff King
2021-02-17 18:35       ` Taylor Blau
2021-02-04  3:59   ` [PATCH v2 3/8] builtin/pack-objects.c: add '--stdin-packs' option Taylor Blau
2021-02-16 23:46     ` Jeff King
2021-02-17 18:59       ` Taylor Blau
2021-02-17 19:21         ` Jeff King
2021-02-04  3:59   ` [PATCH v2 4/8] p5303: add missing &&-chains Taylor Blau
2021-02-04  3:59   ` [PATCH v2 5/8] p5303: measure time to repack with keep Taylor Blau
2021-02-16 23:58     ` Jeff King
2021-02-17  0:02       ` Jeff King
2021-02-17 19:13       ` Taylor Blau
2021-02-17 19:25         ` Jeff King
2021-02-04  3:59   ` [PATCH v2 6/8] builtin/pack-objects.c: rewrite honor-pack-keep logic Taylor Blau
2021-02-17 16:05     ` Jeff King
2021-02-17 19:23       ` Taylor Blau
2021-02-17 19:29         ` Jeff King
2021-02-04  3:59   ` [PATCH v2 7/8] packfile: add kept-pack cache for find_kept_pack_entry() Taylor Blau
2021-02-17 17:11     ` Jeff King
2021-02-17 19:54       ` Taylor Blau
2021-02-17 20:25         ` Jeff King
2021-02-17 20:29           ` Taylor Blau
2021-02-17 21:43             ` Jeff King
2021-02-04  3:59   ` [PATCH v2 8/8] builtin/repack.c: add '--geometric' option Taylor Blau
2021-02-17 18:17     ` Jeff King
2021-02-17 20:01       ` Taylor Blau
2021-02-17  0:01   ` [PATCH v2 0/8] repack: support repacking into a geometric sequence Jeff King
2021-02-17 18:18     ` Jeff King
2021-02-18  3:14 ` [PATCH v3 " Taylor Blau
2021-02-18  3:14   ` [PATCH v3 1/8] packfile: introduce 'find_kept_pack_entry()' Taylor Blau
2021-02-18  3:14   ` [PATCH v3 2/8] revision: learn '--no-kept-objects' Taylor Blau
2021-02-18  3:14   ` [PATCH v3 3/8] builtin/pack-objects.c: add '--stdin-packs' option Taylor Blau
2021-02-18  3:14   ` [PATCH v3 4/8] p5303: add missing &&-chains Taylor Blau
2021-02-18  3:14   ` [PATCH v3 5/8] p5303: measure time to repack with keep Taylor Blau
2021-02-18  3:14   ` [PATCH v3 6/8] builtin/pack-objects.c: rewrite honor-pack-keep logic Taylor Blau
2021-02-18  3:14   ` [PATCH v3 7/8] packfile: add kept-pack cache for find_kept_pack_entry() Taylor Blau
2021-02-18  3:14   ` [PATCH v3 8/8] builtin/repack.c: add '--geometric' option Taylor Blau
2021-02-23  0:31   ` [PATCH v3 0/8] repack: support repacking into a geometric sequence Jeff King
2021-02-23  1:06     ` Taylor Blau
2021-02-23  1:42       ` Jeff King
2021-02-23  2:24 ` [PATCH v4 " Taylor Blau
2021-02-23  2:25   ` [PATCH v4 1/8] packfile: introduce 'find_kept_pack_entry()' Taylor Blau
2021-02-23  2:25   ` [PATCH v4 2/8] revision: learn '--no-kept-objects' Taylor Blau
2021-02-23  2:25   ` [PATCH v4 3/8] builtin/pack-objects.c: add '--stdin-packs' option Taylor Blau
2021-02-23  8:07     ` Junio C Hamano
2021-02-23 18:51       ` Jeff King
2021-02-23  2:25   ` [PATCH v4 4/8] p5303: add missing &&-chains Taylor Blau
2021-02-23  2:25   ` [PATCH v4 5/8] p5303: measure time to repack with keep Taylor Blau
2021-02-23  2:25   ` [PATCH v4 6/8] builtin/pack-objects.c: rewrite honor-pack-keep logic Taylor Blau
2021-02-23  2:25   ` [PATCH v4 7/8] packfile: add kept-pack cache for find_kept_pack_entry() Taylor Blau
2021-02-23  2:25   ` [PATCH v4 8/8] builtin/repack.c: add '--geometric' option Taylor Blau
2021-02-24 23:19     ` Junio C Hamano
2021-02-24 23:43       ` Junio C Hamano
2021-03-04 21:40         ` Taylor Blau
2021-03-04 21:55       ` Taylor Blau
2021-02-23  3:39   ` [PATCH v4 0/8] repack: support repacking into a geometric sequence Jeff King
2021-02-23  7:43   ` Junio C Hamano
2021-02-23 18:44     ` Jeff King
2021-02-23 19:54       ` Martin Fick
2021-02-23 20:06         ` Taylor Blau
2021-02-23 21:57           ` Martin Fick [this message]
2021-02-23 20:15         ` Jeff King
2021-02-23 21:41           ` Martin Fick
2021-02-23 21:53             ` Jeff King
2021-02-24 18:13               ` Martin Fick
2021-02-26  6:23                 ` Jeff King

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