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From: Jeff King <peff@peff.net>
To: Eric Wong <e@80x24.org>
Cc: git@vger.kernel.org, Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Subject: Re: [PATCH] repack: enable bitmaps by default on bare repos
Date: Wed, 13 Mar 2019 10:54:17 -0400
Message-ID: <20190313145417.GA24101@sigill.intra.peff.net> (raw)
In-Reply-To: <20190313015133.n7f7lyujnlwfytre@dcvr>

On Wed, Mar 13, 2019 at 01:51:33AM +0000, Eric Wong wrote:

> But I did find Ævar's forgotten gitperformance doc and thread
> where the topic was brought up:
> 
>   https://public-inbox.org/git/20170403211644.26814-1-avarab@gmail.com/

One thing that thread reminded me of: we probably also want to default
pack.writebitmaphashcache on. Otherwise the time saved during the object
enumeration can backfire when we spend much more time trying delta
compression (because we don't know the pathnames of any objects).

The reason it defaults to off is for on-disk compatibility with JGit.
But I have very little experience running without the hash-cache on. We
added it very early on because we found performance was not great
without it (I don't know if people running JGit have run into the same
problem and if not, why not).

> ------------8<---------
> Subject: [PATCH] repack: enable bitmaps by default on bare repos
> 
> A typical use case for bare repos is for serving clones and
> fetches to clients.  Enable bitmaps by default on bare repos to
> make it easier for admins to host git repos in a performant way.

This looks good to me, with one minor nit:

> +test_expect_success 'incremental repack does not complain' '
> +	git -C bare.git repack -q 2>repack.err &&
> +	! test -s repack.err
> +'

This last line could use "test_must_be_empty".

-Peff

  reply index

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-14  4:31 [PATCH 0/3] some prune optimizations Jeff King
2019-02-14  4:35 ` [PATCH 1/3] prune: lazily perform reachability traversal Jeff King
2019-02-14 10:54   ` Eric Sunshine
2019-02-14 11:07     ` Jeff King
2019-02-14  4:37 ` [PATCH 2/3] prune: use bitmaps for " Jeff King
2019-03-09  2:49   ` bitmaps by default? [was: prune: use bitmaps for reachability traversal] Eric Wong
2019-03-10 23:39     ` Jeff King
2019-03-12  3:13       ` [PATCH] repack: enable bitmaps by default on bare repos Eric Wong
2019-03-12  9:07         ` Ævar Arnfjörð Bjarmason
2019-03-12 10:49         ` Jeff King
2019-03-12 12:05           ` Jeff King
2019-03-13  1:51           ` Eric Wong
2019-03-13 14:54             ` Jeff King [this message]
2019-03-14  9:12               ` [PATCH v3] " Eric Wong
2019-03-14 16:02                 ` Jeff King
2019-03-15  6:21                   ` [PATCH 0/2] enable bitmap hash-cache by default Jeff King
2019-03-15  6:22                     ` [PATCH 1/2] t5310: correctly remove bitmaps for jgit test Jeff King
2019-03-15 13:25                       ` SZEDER Gábor
2019-03-15 18:36                         ` Jeff King
2019-03-15  6:25                     ` [PATCH 2/2] pack-objects: default to writing bitmap hash-cache Jeff King
2019-04-09 15:10                 ` [PATCH v3] repack: enable bitmaps by default on bare repos Ævar Arnfjörð Bjarmason
2019-04-10 22:57                   ` Jeff King
2019-04-25  7:16                     ` Junio C Hamano
2019-05-04  1:37                       ` Jeff King
2019-05-04  6:52                         ` Ævar Arnfjörð Bjarmason
2019-05-04 13:23                           ` SZEDER Gábor
2019-05-08 20:17                             ` Ævar Arnfjörð Bjarmason
2019-05-09  4:24                               ` Junio C Hamano
2019-05-07  7:45                           ` Jeff King
2019-05-07  8:12                             ` Ævar Arnfjörð Bjarmason
2019-05-08  7:11                               ` Jeff King
2019-05-08 14:20                                 ` Derrick Stolee
2019-05-08 16:13                                 ` Ævar Arnfjörð Bjarmason
2019-05-08 22:25                                   ` Jeff King
2019-04-15 15:00   ` [PATCH 2/3] prune: use bitmaps for reachability traversal Derrick Stolee
2019-04-18 19:49     ` Jeff King
2019-04-18 20:08       ` [PATCH] t5304: add a test for pruning with bitmaps Jeff King
2019-04-20  1:01         ` Derrick Stolee
2019-04-20  3:24           ` Jeff King
2019-04-20 21:01             ` Derrick Stolee
2019-02-14  4:38 ` [PATCH 3/3] prune: check SEEN flag for reachability Jeff King

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