Vicent Marti ae4f07fbcc pack-bitmap: implement optional name_hash cache ... When we use pack bitmaps rather than walking the object graph, we end up with the list of objects to include in the packfile, but we do not know the path at which any tree or blob objects would be found. In a recently packed repository, this is fine. A fetch would use the paths only as a heuristic in the delta compression phase, and a fully packed repository should not need to do much delta compression. As time passes, though, we may acquire more objects on top of our large bitmapped pack. If clients fetch frequently, then they never even look at the bitmapped history, and all works as usual. However, a client who has not fetched since the last bitmap repack will have "have" tips in the bitmapped history, but "want" newer objects. The bitmaps themselves degrade gracefully in this circumstance. We manually walk the more recent bits of history, and then use bitmaps when we hit them. But we would also like to perform delta compression between the newer objects and the bitmapped objects (both to delta against what we know the user already has, but also between "new" and "old" objects that the user is fetching). The lack of pathnames makes our delta heuristics much less effective. This patch adds an optional cache of the 32-bit name_hash values to the end of the bitmap file. If present, a reader can use it to match bitmapped and non-bitmapped names during delta compression. Here are perf results for p5310: Test origin/master HEAD^ HEAD ------------------------------------------------------------------------------------------------- 5310.2: repack to disk 36.81(37.82+1.43) 47.70(48.74+1.41) +29.6% 47.75(48.70+1.51) +29.7% 5310.3: simulated clone 30.78(29.70+2.14) 1.08(0.97+0.10) -96.5% 1.07(0.94+0.12) -96.5% 5310.4: simulated fetch 3.16(6.10+0.08) 3.54(10.65+0.06) +12.0% 1.70(3.07+0.06) -46.2% 5310.6: partial bitmap 36.76(43.19+1.81) 6.71(11.25+0.76) -81.7% 4.08(6.26+0.46) -88.9% You can see that the time spent on an incremental fetch goes down, as our delta heuristics are able to do their work. And we save time on the partial bitmap clone for the same reason. Signed-off-by: Vicent Marti <tanoku@gmail.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>		2013-12-30 12:19:23 -08:00
..
RelNotes	Update draft release notes to 1.8.5	2013-10-23 13:37:27 -07:00
howto	Merge branch 'rj/doc-formatting-fix'	2013-10-14 11:07:50 -07:00
technical	pack-bitmap: implement optional name_hash cache	2013-12-30 12:19:23 -08:00
.gitattributes	…
.gitignore	…
CodingGuidelines	CodingGuidelines: style for multi-line comments	2013-10-14 12:48:06 -07:00
Makefile	Documentation/Makefile: make AsciiDoc dblatex dir configurable	2013-10-03 12:21:19 -07:00
SubmittingPatches	Provide some linguistic guidance for the documentation.	2013-08-01 13:13:52 -07:00
asciidoc.conf	…
blame-options.txt	blame: document multiple -L support	2013-08-06 14:34:43 -07:00
build-docdep.perl	…
cat-texi.perl	…
cmd-list.perl	…
config.txt	pack-bitmap: implement optional name_hash cache	2013-12-30 12:19:23 -08:00
date-formats.txt	…
diff-config.txt	Improve documentation concerning the status.submodulesummary setting	2013-09-11 12:20:41 -07:00
diff-format.txt	…
diff-generate-patch.txt	…
diff-options.txt	Merge branch 'mm/diff-no-patch-synonym-to-s'	2013-07-22 11:23:27 -07:00
docbook-xsl.css	…
docbook.xsl	…
everyday.txt	Documentation: make AsciiDoc links always point to HTML files	2013-09-06 14:49:06 -07:00
fetch-options.txt	Merge branch 'rr/maint-fetch-tag-doc-asterisks' into maint	2013-07-21 22:51:45 -07:00
fix-texi.perl	…
git-add.txt	…
git-am.txt	am: replace uses of --resolved with --continue	2013-06-27 09:37:12 -07:00
git-annotate.txt	…
git-apply.txt	…
git-archimport.txt	…
git-archive.txt	…
git-bisect-lk2009.txt	typofix: documentation	2013-07-22 16:06:48 -07:00
git-bisect.txt	…
git-blame.txt	blame: document multiple -L support	2013-08-06 14:34:43 -07:00
git-branch.txt	Refer to branch.<name>.remote/merge when documenting --track	2013-09-09 11:03:01 -07:00
git-bundle.txt	…
git-cat-file.txt	Merge branch 'rh/ishes-doc'	2013-09-17 11:42:51 -07:00
git-check-attr.txt	Merge branch 'jc/check-x-z'	2013-09-04 12:23:25 -07:00
git-check-ignore.txt	check-ignore: Add option to ignore index contents	2013-09-12 15:40:29 -07:00
git-check-mailmap.txt	builtin: add git-check-mailmap command	2013-07-13 10:19:37 -07:00
git-check-ref-format.txt	Add new @ shortcut for HEAD	2013-09-12 14:39:34 -07:00
git-checkout-index.txt	…
git-checkout.txt	checkout: update synopsys and documentation on detaching HEAD	2013-09-11 12:32:01 -07:00
git-cherry-pick.txt	…
git-cherry.txt	doc: don't claim that cherry calls patch-id	2013-09-24 15:54:48 -07:00
git-citool.txt	…
git-clean.txt	Documentation/git-clean: fix description for range	2013-07-24 19:16:13 -07:00
git-clone.txt	Revert "git-clone.txt: remove the restriction on pushing from a shallow clone"	2013-07-15 08:35:32 -07:00
git-column.txt	…
git-commit-tree.txt	…
git-commit.txt	…
git-config.txt	Merge branch 'jc/url-match'	2013-09-09 14:50:36 -07:00
git-count-objects.txt	…
git-credential-cache--daemon.txt	…
git-credential-cache.txt	…
git-credential-store.txt	…
git-credential.txt	Documentation: make AsciiDoc links always point to HTML files	2013-09-06 14:49:06 -07:00
git-cvsexportcommit.txt	…
git-cvsimport.txt	…
git-cvsserver.txt	…
git-daemon.txt	…
git-describe.txt	use 'commit-ish' instead of 'committish'	2013-09-04 15:03:03 -07:00
git-diff-files.txt	…
git-diff-index.txt	…
git-diff-tree.txt	…
git-diff.txt	diff --no-index: describe in a separate paragraph	2013-08-28 15:17:18 -07:00
git-difftool.txt	…
git-fast-export.txt	Documentation: Update 'linux-2.6.git' -> 'linux.git'	2013-06-22 23:36:48 -07:00
git-fast-import.txt	Merge branch 'rh/ishes-doc'	2013-09-17 11:42:51 -07:00
git-fetch-pack.txt	Merge branch 'nd/clone-connectivity-shortcut'	2013-09-09 14:30:01 -07:00
git-fetch.txt	…
git-filter-branch.txt	…
git-fmt-merge-msg.txt	…
git-for-each-ref.txt	…
git-format-patch.txt	format-patch doc: Thunderbird wraps lines unless mailnews.wraplength=0	2013-10-14 16:20:01 -07:00
git-fsck-objects.txt	…
git-fsck.txt	…
git-gc.txt	Merge branch 'nd/gc-lock-against-each-other'	2013-09-04 12:35:34 -07:00
git-get-tar-commit-id.txt	…
git-grep.txt	Merge branch 'mg/more-textconv'	2013-10-23 13:21:31 -07:00
git-gui.txt	…
git-hash-object.txt	…
git-help.txt	…
git-http-backend.txt	…
git-http-fetch.txt	…
git-http-push.txt	…
git-imap-send.txt	…
git-index-pack.txt	…
git-init-db.txt	…
git-init.txt	…
git-instaweb.txt	…
git-log.txt	line-range-format.txt: clarify -L:regex usage form	2013-08-06 14:26:26 -07:00
git-lost-found.txt	…
git-ls-files.txt	…
git-ls-remote.txt	ls-remote doc: don't encourage use of branches-file	2013-06-23 00:33:58 -07:00
git-ls-tree.txt	…
git-mailinfo.txt	…
git-mailsplit.txt	…
git-merge-base.txt	…
git-merge-file.txt	Documentation/git-merge-file: document option "--diff3"	2013-08-09 14:19:59 -07:00
git-merge-index.txt	…
git-merge-one-file.txt	…
git-merge-tree.txt	use 'tree-ish' instead of 'treeish'	2013-09-04 15:02:56 -07:00
git-merge.txt	git-merge: document the -S option	2013-10-18 12:47:33 -07:00
git-mergetool--lib.txt	…
git-mergetool.txt	…
git-mktag.txt	…
git-mktree.txt	…
git-mv.txt	mv: update the path entry in .gitmodules for moved submodules	2013-08-06 14:10:35 -07:00
git-name-rev.txt	use 'commit-ish' instead of 'committish'	2013-09-04 15:03:03 -07:00
git-notes.txt	…
git-p4.txt	Change "remote tracking" to "remote-tracking"	2013-07-03 13:27:15 -07:00
git-pack-objects.txt	…
git-pack-redundant.txt	…
git-pack-refs.txt	Documentation: remove --prune from pack-refs examples	2013-07-18 16:23:46 -07:00
git-parse-remote.txt	…
git-patch-id.txt	…
git-peek-remote.txt	…
git-prune-packed.txt	git-prune-packed.txt: fix reference to GIT_OBJECT_DIRECTORY	2013-10-15 16:01:22 -07:00
git-prune.txt	Documentation: fix git-prune example usage	2013-07-18 16:23:51 -07:00
git-pull.txt	pull: allow pull to preserve merges when rebasing	2013-09-04 12:45:48 -07:00
git-push.txt	Merge branch 'rh/ishes-doc'	2013-09-17 11:42:51 -07:00
git-quiltimport.txt	…
git-read-tree.txt	…
git-rebase.txt	Documentation: make AsciiDoc links always point to HTML files	2013-09-06 14:49:06 -07:00
git-receive-pack.txt	…
git-reflog.txt	…
git-relink.txt	…
git-remote-ext.txt	…
git-remote-fd.txt	…
git-remote-helpers.txto	…
git-remote-testgit.txt	…
git-remote.txt	remote doc: document long forms of set-head options	2013-09-27 16:49:18 -07:00
git-repack.txt	repack: consider bitmaps when performing repacks	2013-12-30 12:19:23 -08:00
git-replace.txt	Doc: 'replace' merge and non-merge commits	2013-09-09 08:16:30 -07:00
git-repo-config.txt	…
git-request-pull.txt	…
git-rerere.txt	…
git-reset.txt	Documentation: "git reset <tree-ish> <pathspec>" takes a tree-ish, not tree-sh	2013-07-19 10:15:09 -07:00
git-rev-list.txt	rev-list: add bitmap mode to speed up object lists	2013-12-30 12:19:22 -08:00
git-rev-parse.txt	Merge branch 'rj/doc-rev-parse'	2013-08-30 10:08:13 -07:00
git-revert.txt	Documentation: make AsciiDoc links always point to HTML files	2013-09-06 14:49:06 -07:00
git-rm.txt	rm: delete .gitmodules entry of submodules removed from the work tree	2013-08-06 14:11:00 -07:00
git-send-email.txt	send-email: be explicit with SSL certificate verification	2013-07-18 16:01:30 -07:00
git-send-pack.txt	…
git-sh-i18n--envsubst.txt	…
git-sh-i18n.txt	…
git-sh-setup.txt	Merge branch 'jc/reflog-doc'	2013-10-18 13:50:12 -07:00
git-shell.txt	…
git-shortlog.txt	…
git-show-branch.txt	…
git-show-index.txt	…
git-show-ref.txt	Merge branch 'db/show-ref-head'	2013-07-22 11:23:56 -07:00
git-show.txt	Documentation/git-show.txt: include common diff options, like git-log.txt	2013-07-17 17:50:56 -07:00
git-stage.txt	…
git-stash.txt	Revert "git stash: avoid data loss when "git stash save" kills a directory"	2013-08-14 09:53:43 -07:00
git-status.txt	Improve documentation concerning the status.submodulesummary setting	2013-09-11 12:20:41 -07:00
git-stripspace.txt	…
git-submodule.txt	Merge branch 'fg/submodule-clone-depth'	2013-07-15 10:28:48 -07:00
git-svn.txt	git-svn: Warn about changing default for --prefix in Git v2.0	2013-10-12 22:30:53 +00:00
git-symbolic-ref.txt	…
git-tag.txt	Merge branch 'ds/doc-two-kinds-of-tags'	2013-07-31 12:38:21 -07:00
git-tar-tree.txt	…
git-tools.txt	…
git-unpack-file.txt	…
git-unpack-objects.txt	…
git-update-index.txt	…
git-update-ref.txt	update-ref: support multiple simultaneous updates	2013-09-09 09:54:37 -07:00
git-update-server-info.txt	…
git-upload-archive.txt	…
git-upload-pack.txt	…
git-var.txt	…
git-verify-pack.txt	…
git-verify-tag.txt	…
git-web--browse.txt	web--browse: support /usr/bin/cygstart on Cygwin	2013-06-21 09:05:15 -07:00
git-whatchanged.txt	whatchanged: document its historical nature	2013-08-13 09:01:54 -07:00
git-write-tree.txt	…
git.txt	Merge branch 'jc/reflog-doc'	2013-10-18 13:50:12 -07:00
gitattributes.txt	…
gitcli.txt	Merge branch 'po/dot-url'	2013-10-23 13:21:48 -07:00
gitcore-tutorial.txt	core-tutorial: trim the section on Inspecting Changes	2013-08-13 09:01:52 -07:00
gitcredentials.txt	…
gitcvs-migration.txt	Documentation: make AsciiDoc links always point to HTML files	2013-09-06 14:49:06 -07:00
gitdiffcore.txt	…
gitglossary.txt	…
githooks.txt	…
gitignore.txt	…
gitk.txt	…
gitmodules.txt	Improve documentation concerning the status.submodulesummary setting	2013-09-11 12:20:41 -07:00
gitnamespaces.txt	…
gitremote-helpers.txt	Merge branch 'mm/remote-helpers-doc'	2013-09-12 14:41:50 -07:00
gitrepository-layout.txt	…
gitrevisions.txt	…
gittutorial-2.txt	…
gittutorial.txt	…
gitweb.conf.txt	gitweb: allow extra breadcrumbs to prefix the trail	2013-07-04 21:52:15 -07:00
gitweb.txt	typofix: documentation	2013-07-22 16:06:48 -07:00
gitworkflows.txt	…
glossary-content.txt	Merge branch 'rh/ishes-doc'	2013-09-17 11:42:51 -07:00
howto-index.sh	…
i18n.txt	…
install-doc-quick.sh	…
install-webdoc.sh	…
line-range-format.txt	line-range: teach -L^:RE to search from start of file	2013-08-06 14:48:02 -07:00
mailmap.txt	…
manpage-1.72.xsl	…
manpage-base-url.xsl.in	…
manpage-base.xsl	…
manpage-bold-literal.xsl	…
manpage-normal.xsl	…
manpage-quote-apos.xsl	…
manpage-suppress-sp.xsl	…
merge-config.txt	…
merge-options.txt	Merge branch 'rh/merge-options-doc-fix' into maint	2013-07-03 15:36:30 -07:00
merge-strategies.txt	…
pretty-formats.txt	…
pretty-options.txt	log doc: the argument to --encoding is not optional	2013-08-05 08:19:47 -07:00
pull-fetch-param.txt	…
rev-list-options.txt	rev-list: add bitmap mode to speed up object lists	2013-12-30 12:19:22 -08:00
revisions.txt	Merge branch 'fc/at-head'	2013-09-20 12:38:10 -07:00
sequencer.txt	…
urls-remotes.txt	…
urls.txt	Merge branch 'ft/doc-git-transport' into maint	2013-07-21 22:51:24 -07:00
user-manual.conf	…
user-manual.txt	Merge branch 'ss/doclinks'	2013-09-17 11:42:54 -07:00