git@vger.kernel.org list mirror (unofficial, one of many)
 help / color / Atom feed
From: Eric Wong <e@80x24.org>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org
Subject: bitmaps by default? [was: prune: use bitmaps for reachability traversal]
Date: Sat, 9 Mar 2019 02:49:44 +0000
Message-ID: <20190309024944.zcbwgvn52jsw2a2e@dcvr> (raw)
In-Reply-To: <20190214043743.GB19183@sigill.intra.peff.net>

Jeff King <peff@peff.net> wrote:
> Pruning generally has to traverse the whole commit graph in order to
> see which objects are reachable. This is the exact problem that
> reachability bitmaps were meant to solve, so let's use them (if they're
> available, of course).

Perhaps this is good impetus for doing bitmaps by default?

It would make life easier for people new to hosting git servers
(and hopefully reduce centralization :)


I started working on it, but t0410-partial-clone.sh fails with
"Failed to write bitmap index. Packfile doesn't have full
closure"; so more work needs to be done w.r.t. default behavior
on partial clones...

Here's my WIP:

diff --git a/builtin/repack.c b/builtin/repack.c
index 67f8978043..ca98d32715 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -14,7 +14,7 @@
 
 static int delta_base_offset = 1;
 static int pack_kept_objects = -1;
-static int write_bitmaps;
+static int write_bitmaps = -1;
 static int use_delta_islands;
 static char *packdir, *packtmp;
 
@@ -344,10 +344,14 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 		die(_("--keep-unreachable and -A are incompatible"));
 
 	if (pack_kept_objects < 0)
-		pack_kept_objects = write_bitmaps;
+		pack_kept_objects = write_bitmaps > 0;
 
-	if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
-		die(_(incremental_bitmap_conflict_error));
+	if (!(pack_everything & ALL_INTO_ONE)) {
+		if (write_bitmaps > 0)
+			die(_(incremental_bitmap_conflict_error));
+	} else if (write_bitmaps < 0) {
+		write_bitmaps = 1;
+	}
 
 	packdir = mkpathdup("%s/pack", get_object_directory());
 	packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
@@ -368,7 +372,7 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	argv_array_push(&cmd.args, "--indexed-objects");
 	if (repository_format_partial_clone)
 		argv_array_push(&cmd.args, "--exclude-promisor-objects");
-	if (write_bitmaps)
+	if (write_bitmaps > 0)
 		argv_array_push(&cmd.args, "--write-bitmap-index");
 	if (use_delta_islands)
 		argv_array_push(&cmd.args, "--delta-islands");

  reply index

Thread overview: 57+ 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   ` Eric Wong [this message]
2019-03-10 23:39     ` bitmaps by default? [was: prune: use bitmaps for reachability traversal] 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
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
2019-05-23 11:30                     ` Jeff King
2019-05-23 12:53                       ` Derrick Stolee
2019-05-24  7:24                         ` Jeff King
2019-05-24 10:33                           ` Derrick Stolee
2019-05-23 19:26                       ` Ævar Arnfjörð Bjarmason
2019-05-24  7:27                         ` Jeff King
2019-05-24  7:55                           ` Ævar Arnfjörð Bjarmason
2019-05-24  8:26                             ` Jeff King
2019-05-24  9:01                               ` Ævar Arnfjörð Bjarmason
2019-05-24  9:29                                 ` SZEDER Gábor
2019-05-24 11:17                                   ` Ævar Arnfjörð Bjarmason
2019-05-24 11:41                                     ` SZEDER Gábor
2019-05-24 11:58                                       ` Ævar Arnfjörð Bjarmason
2019-05-24 12:34                                         ` SZEDER Gábor
2019-05-24 13:41                                           ` Ævar Arnfjörð Bjarmason
2019-05-24 11:31                       ` [PATCH] pack-bitmap: look for an uninteresting bitmap Derrick Stolee
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

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: http://vger.kernel.org/majordomo-info.html

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190309024944.zcbwgvn52jsw2a2e@dcvr \
    --to=e@80x24.org \
    --cc=git@vger.kernel.org \
    --cc=peff@peff.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

git@vger.kernel.org list mirror (unofficial, one of many)

Archives are clonable:
	git clone --mirror https://public-inbox.org/git
	git clone --mirror http://ou63pmih66umazou.onion/git
	git clone --mirror http://czquwvybam4bgbro.onion/git
	git clone --mirror http://hjrcffqmbrq6wope.onion/git

Example config snippet for mirrors

Newsgroups are available over NNTP:
	nntp://news.public-inbox.org/inbox.comp.version-control.git
	nntp://ou63pmih66umazou.onion/inbox.comp.version-control.git
	nntp://czquwvybam4bgbro.onion/inbox.comp.version-control.git
	nntp://hjrcffqmbrq6wope.onion/inbox.comp.version-control.git
	nntp://news.gmane.org/gmane.comp.version-control.git

 note: .onion URLs require Tor: https://www.torproject.org/

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git