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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Derrick Stolee <stolee@gmail.com>
Cc: git@vger.kernel.org, dstolee@microsoft.com,
	git@jeffhostetler.com, peff@peff.net, gitster@pobox.com,
	johannes.schindelin@gmx.de, jrnieder@gmail.com
Subject: Re: [RFC PATCH 00/18] Multi-pack index (MIDX)
Date: Mon, 08 Jan 2018 12:43:25 +0100	[thread overview]
Message-ID: <87fu7gbmoy.fsf@evledraar.gmail.com> (raw)
In-Reply-To: <c08416f1-bbec-2037-34a6-f454d85de439@gmail.com>


On Mon, Jan 08 2018, Derrick Stolee jotted:

> On 1/7/2018 5:42 PM, Ævar Arnfjörð Bjarmason wrote:
>> If something cares about both throughput and e.g. is saving the
>> abbreviated SHA-1s isn't it better off picking some arbitrary size
>> (e.g. --abbrev=20), after all the default abbreviation is going to show
>> something as small as possible, which may soon become ambigous after the
>> next commit.
>
> Unfortunately, with the way the abbreviation algorithms work, using
> --abbrev=20 will have similar performance problems because you still
> need to inspect all packfiles to ensure there isn't a collision in the
> first 20 hex characters.

I meant (but forgot to write) that this would be some new mode,
e.g. --abbrev=20 --no-abbrev-check which would just perform a substr()
of the 40 character SHA-1. It might be interesting to add that for
reasons completely unrelated to your series.

Thanks for answering the rest.

  parent reply	other threads:[~2018-01-08 11:43 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-07 18:14 [RFC PATCH 00/18] Multi-pack index (MIDX) Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 01/18] docs: Multi-Pack Index (MIDX) Design Notes Derrick Stolee
2018-01-08 19:32   ` Jonathan Tan
2018-01-08 20:35     ` Derrick Stolee
2018-01-08 22:06       ` Jonathan Tan
2018-01-07 18:14 ` [RFC PATCH 02/18] midx: specify midx file format Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 03/18] midx: create core.midx config setting Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 04/18] midx: write multi-pack indexes for an object list Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 05/18] midx: create midx builtin with --write mode Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 06/18] midx: add t5318-midx.sh test script Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 07/18] midx: teach midx --write to update midx-head Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 08/18] midx: teach git-midx to read midx file details Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 09/18] midx: find details of nth object in midx Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 10/18] midx: use existing midx when writing Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 11/18] midx: teach git-midx to clear midx files Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 12/18] midx: teach git-midx to delete expired files Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 13/18] t5318-midx.h: confirm git actions are stable Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 14/18] midx: load midx files when loading packs Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 15/18] midx: use midx for approximate object count Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 16/18] midx: nth_midxed_object_oid() and bsearch_midx() Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 17/18] sha1_name: use midx for abbreviations Derrick Stolee
2018-01-07 18:14 ` [RFC PATCH 18/18] packfile: use midx for object loads Derrick Stolee
2018-01-07 22:42 ` [RFC PATCH 00/18] Multi-pack index (MIDX) Ævar Arnfjörð Bjarmason
2018-01-08  0:08   ` Derrick Stolee
2018-01-08 10:20     ` Jeff King
2018-01-08 10:27       ` Jeff King
2018-01-08 12:28         ` Ævar Arnfjörð Bjarmason
2018-01-08 13:43       ` Johannes Schindelin
2018-01-09  6:50         ` Jeff King
2018-01-09 13:05           ` Johannes Schindelin
2018-01-09 19:51             ` Stefan Beller
2018-01-09 20:12               ` Junio C Hamano
2018-01-09 20:16                 ` Stefan Beller
2018-01-09 21:31                   ` Junio C Hamano
2018-01-10 17:05               ` Johannes Schindelin
2018-01-10 10:57             ` Jeff King
2018-01-08 13:43       ` Derrick Stolee
2018-01-09  7:12         ` Jeff King
2018-01-08 11:43     ` Ævar Arnfjörð Bjarmason [this message]
2018-06-06  8:13     ` Ævar Arnfjörð Bjarmason
2018-06-06 10:27       ` [RFC PATCH 0/2] unconditional O(1) SHA-1 abbreviation Ævar Arnfjörð Bjarmason
2018-06-06 10:27       ` [RFC PATCH 1/2] config.c: use braces on multiple conditional arms Ævar Arnfjörð Bjarmason
2018-06-06 10:27       ` [RFC PATCH 2/2] sha1-name: add core.validateAbbrev & relative core.abbrev Ævar Arnfjörð Bjarmason
2018-06-06 12:04         ` Christian Couder
2018-06-06 11:24       ` [RFC PATCH 00/18] Multi-pack index (MIDX) Derrick Stolee
2018-01-10 18:25 ` Martin Fick
2018-01-10 19:39   ` Derrick Stolee
2018-01-10 21:01     ` Martin Fick

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