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Colin Stolley ec48540fe8 packfile.c: speed up loading lots of packfiles
When loading packfiles on start-up, we traverse the internal packfile
list once per file to avoid reloading packfiles that have already
been loaded. This check runs in quadratic time, so for poorly
maintained repos with a large number of packfiles, it can be pretty
slow.

Add a hashmap containing the packfile names as we load them so that
the average runtime cost of checking for already-loaded packs becomes
constant.

Add a perf test to p5303 to show speed-up.

The existing p5303 test runtimes are dominated by other factors and do
not show an appreciable speed-up. The new test in p5303 clearly exposes
a speed-up in bad cases. In this test we create 10,000 packfiles and
measure the start-up time of git rev-parse, which does little else
besides load in the packs.

Here are the numbers for the new p5303 test:

Test                         HEAD^             HEAD
---------------------------------------------------------------------
5303.12: load 10,000 packs   1.03(0.92+0.10)   0.12(0.02+0.09) -88.3%

Signed-off-by: Colin Stolley <cstolley@runbox.com>
Helped-by: Jeff King <peff@peff.net>
[jc: squashed the change to call hashmap in install_packed_git() by peff]
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-12-03 07:59:45 -08:00
.github
Documentation The first batch post 2.24 cycle 2019-11-10 18:02:17 +09:00
block-sha1
builtin Merge branch 'bc/hash-independent-tests-part-6' 2019-11-10 18:02:17 +09:00
ci Merge branch 'sg/ci-osx-gcc8-fix' 2019-10-24 13:34:03 +09:00
compat Merge branch 'js/mingw-needs-hiding-fix' 2019-10-30 15:13:13 +09:00
contrib Merge branch 'nr/diff-highlight-indent-fix' 2019-10-23 14:43:09 +09:00
ewah
git-gui Merge https://github.com/prati0100/git-gui 2019-11-04 13:29:38 +09:00
gitk-git
gitweb gitweb: correctly store previous rev in javascript-actions mode 2019-10-28 11:06:57 +09:00
mergetools
negotiator
perl
po l10n: zh_CN: for git v2.24.0 l10n round 1~2 2019-11-02 20:51:12 +08:00
ppc
refs
sha1collisiondetection@855827c583
sha1dc
sha256
t packfile.c: speed up loading lots of packfiles 2019-12-03 07:59:45 -08:00
templates
trace2
vcs-svn
xdiff xdiffi: fix typos and touch up comments 2019-10-09 10:58:34 +09:00
.clang-format
.editorconfig
.gitattributes
.gitignore Merge branch 'dl/honor-cflags-in-hdr-check' 2019-10-07 11:33:02 +09:00
.gitmodules
.mailmap
.travis.yml
.tsan-suppressions
CODE_OF_CONDUCT.md CODE_OF_CONDUCT: mention individual project-leader emails 2019-10-10 10:41:46 +09:00
COPYING
GIT-VERSION-GEN The first batch post 2.24 cycle 2019-11-10 18:02:17 +09:00
INSTALL
LGPL-2.1
Makefile Merge branch 'dl/allow-running-cocci-verbosely' 2019-10-18 11:40:48 +09:00
README.md git-gui: add a readme 2019-10-12 21:29:30 +05:30
RelNotes The first batch post 2.24 cycle 2019-11-10 18:02:17 +09:00
abspath.c
aclocal.m4
advice.c
advice.h
alias.c
alias.h
alloc.c
alloc.h
apply.c Merge branch 'dl/apply-3way-diff3' 2019-11-10 18:02:15 +09:00
apply.h
archive-tar.c
archive-zip.c
archive.c
archive.h
argv-array.c
argv-array.h
attr.c Merge branch 'ew/hashmap' 2019-10-15 13:48:02 +09:00
attr.h
azure-pipelines.yml Merge branch 'js/azure-pipelines-msvc' 2019-10-23 11:06:46 +09:00
banned.h
base85.c
bisect.c
bisect.h
blame.c Merge branch 'ew/hashmap' 2019-10-15 13:48:02 +09:00
blame.h
blob.c
blob.h
branch.c
branch.h
builtin.h
bulk-checkin.c
bulk-checkin.h
bundle.c
bundle.h
cache-tree.c Merge branch 'en/merge-recursive-cleanup' 2019-10-15 13:47:59 +09:00
cache-tree.h
cache.h Merge branch 'js/azure-pipelines-msvc' 2019-10-15 13:48:00 +09:00
chdir-notify.c
chdir-notify.h
check-builtins.sh
check_bindir
checkout.c
checkout.h
color.c
color.h
column.c column: use utf8_strnwidth() to strip out ANSI color escapes 2019-10-15 10:54:15 +09:00
column.h
combine-diff.c
command-list.txt
commit-graph.c Merge branch 'ds/commit-graph-on-fetch' 2019-11-04 13:33:06 +09:00
commit-graph.h
commit-reach.c commit-graph: fix writing first commit-graph during fetch 2019-10-25 11:19:16 +09:00
commit-reach.h
commit-slab-decl.h
commit-slab-impl.h
commit-slab.h
commit.c Merge branch 'pw/post-commit-from-sequencer' 2019-11-10 18:02:12 +09:00
commit.h
common-main.c
config.c Merge branch 'ew/hashmap' 2019-10-15 13:48:02 +09:00
config.h
config.mak.dev
config.mak.in
config.mak.uname
configure.ac
connect.c
connect.h
connected.c Merge branch 'bc/object-id-part17' 2019-10-11 14:24:46 +09:00
connected.h
convert.c Merge branch 'rs/convert-fix-utf-without-dash' 2019-10-09 14:01:00 +09:00
convert.h
copy.c
credential-cache--daemon.c
credential-cache.c
credential-store.c
credential.c
credential.h
csum-file.c
csum-file.h
ctype.c
daemon.c
date.c
decorate.c
decorate.h
delta-islands.c
delta-islands.h
delta.h
detect-compiler
diff-delta.c
diff-lib.c
diff-no-index.c
diff.c Merge branch 'ew/hashmap' 2019-10-15 13:48:02 +09:00
diff.h
diffcore-break.c
diffcore-delta.c
diffcore-order.c
diffcore-pickaxe.c
diffcore-rename.c Merge branch 'ew/hashmap' 2019-10-15 13:48:02 +09:00
diffcore.h
dir-iterator.c
dir-iterator.h
dir.c Merge branch 'en/clean-nested-with-ignored' 2019-10-11 14:24:46 +09:00
dir.h Merge branch 'en/clean-nested-with-ignored' 2019-10-11 14:24:46 +09:00
editor.c
entry.c
environment.c
exec-cmd.c
exec-cmd.h
fast-import.c Merge branch 'en/fast-imexport-nested-tags' 2019-10-15 13:48:00 +09:00
fetch-negotiator.c
fetch-negotiator.h
fetch-pack.c Merge branch 'jt/fetch-pack-record-refs-in-the-dot-promisor' 2019-11-10 18:02:10 +09:00
fetch-pack.h
fmt-merge-msg.h
fsck.c
fsck.h
fsmonitor.c fsmonitor: don't fill bitmap with entries to be removed 2019-10-12 10:16:11 +09:00
fsmonitor.h
fuzz-commit-graph.c
fuzz-pack-headers.c
fuzz-pack-idx.c
generate-cmdlist.sh
gettext.c
gettext.h
git-add--interactive.perl
git-archimport.perl
git-bisect.sh
git-compat-util.h Merge branch 'bb/compat-util-comment-fix' 2019-10-18 11:40:48 +09:00
git-cvsexportcommit.perl
git-cvsimport.perl
git-cvsserver.perl
git-difftool--helper.sh
git-filter-branch.sh
git-instaweb.sh
git-legacy-stash.sh Merge branch 'js/update-index-ignore-removal-for-skip-worktree' 2019-11-10 18:02:16 +09:00
git-merge-octopus.sh
git-merge-one-file.sh
git-merge-resolve.sh
git-mergetool--lib.sh
git-mergetool.sh
git-p4.py
git-parse-remote.sh
git-quiltimport.sh
git-rebase--preserve-merges.sh
git-request-pull.sh
git-send-email.perl
git-sh-i18n.sh
git-sh-setup.sh
git-submodule.sh
git-svn.perl
git-web--browse.sh
git.c
git.rc
gpg-interface.c
gpg-interface.h
graph.c
graph.h
grep.c Merge branch 'cb/pcre2-chartables-leakfix' 2019-10-23 14:43:11 +09:00
grep.h Merge branch 'cb/pcre2-chartables-leakfix' 2019-10-23 14:43:11 +09:00
hash.h
hashmap.c
hashmap.h
help.c
help.h
hex.c
http-backend.c
http-fetch.c
http-push.c http-push: simplify deleting a list item 2019-10-15 10:53:50 +09:00
http-walker.c
http.c
http.h
ident.c
imap-send.c
interdiff.c
interdiff.h
iterator.h
json-writer.c
json-writer.h
khash.h
kwset.c
kwset.h
levenshtein.c
levenshtein.h
line-log.c
line-log.h
line-range.c
line-range.h
linear-assignment.c
linear-assignment.h
list-objects-filter-options.c
list-objects-filter-options.h
list-objects-filter.c
list-objects-filter.h
list-objects.c
list-objects.h
list.h
ll-merge.c
ll-merge.h
lockfile.c
lockfile.h
log-tree.c
log-tree.h
ls-refs.c
ls-refs.h
mailinfo.c
mailinfo.h
mailmap.c
mailmap.h
match-trees.c
mem-pool.c
mem-pool.h
merge-blobs.c
merge-blobs.h
merge-recursive.c Merge branch 'en/merge-recursive-directory-rename-fixes' 2019-11-10 18:02:13 +09:00
merge-recursive.h
merge.c
mergesort.c
mergesort.h
midx.c midx: honor the MIDX_PROGRESS flag in midx_repack 2019-10-23 12:05:06 +09:00
midx.h midx: add MIDX_PROGRESS flag 2019-10-23 12:05:05 +09:00
name-hash.c
notes-cache.c
notes-cache.h
notes-merge.c
notes-merge.h
notes-utils.c
notes-utils.h
notes.c
notes.h
object-store.h packfile.c: speed up loading lots of packfiles 2019-12-03 07:59:45 -08:00
object.c packfile.c: speed up loading lots of packfiles 2019-12-03 07:59:45 -08:00
object.h commit-graph: fix writing first commit-graph during fetch 2019-10-25 11:19:16 +09:00
oidmap.c
oidmap.h
oidset.c
oidset.h
pack-bitmap-write.c
pack-bitmap.c
pack-bitmap.h
pack-check.c
pack-objects.c
pack-objects.h
pack-revindex.c
pack-revindex.h
pack-write.c
pack.h
packfile.c packfile.c: speed up loading lots of packfiles 2019-12-03 07:59:45 -08:00
packfile.h
pager.c
parse-options-cb.c
parse-options.c
parse-options.h
patch-delta.c
patch-ids.c
patch-ids.h
path.c Merge branch 'sg/dir-trie-fixes' 2019-11-10 18:02:14 +09:00
path.h
pathspec.c
pathspec.h
pkt-line.c
pkt-line.h
preload-index.c
pretty.c pretty: add "%aL" etc. to show local-part of email addresses 2019-10-30 11:49:41 +09:00
pretty.h
prio-queue.c
prio-queue.h
progress.c
progress.h
promisor-remote.c
promisor-remote.h Merge branch 'dl/honor-cflags-in-hdr-check' 2019-10-07 11:33:02 +09:00
prompt.c
prompt.h
protocol.c
protocol.h
quote.c Merge branch 'gs/sq-quote-buf-pretty' 2019-10-15 13:48:02 +09:00
quote.h
range-diff.c Merge branch 'ew/hashmap' 2019-10-15 13:48:02 +09:00
range-diff.h
reachable.c
reachable.h
read-cache.c Merge branch 'js/azure-pipelines-msvc' 2019-10-15 13:48:00 +09:00
rebase-interactive.c
rebase-interactive.h
ref-filter.c Merge branch 'ew/hashmap' 2019-10-15 13:48:02 +09:00
ref-filter.h
reflog-walk.c
reflog-walk.h
refs.c
refs.h
refspec.c
refspec.h
remote-curl.c Merge branch 'bc/smart-http-atomic-push' 2019-10-23 14:43:11 +09:00
remote-testsvn.c
remote.c
remote.h
replace-object.c
replace-object.h
repo-settings.c Merge branch 'ds/feature-macros' 2019-10-24 13:34:03 +09:00
repository.c
repository.h
rerere.c
rerere.h
resolve-undo.c
resolve-undo.h
revision.c Merge branch 'ew/hashmap' 2019-10-15 13:48:02 +09:00
revision.h
run-command.c
run-command.h
send-pack.c send-pack: never fetch when checking exclusions 2019-10-09 10:46:41 +09:00
send-pack.h
sequencer.c Merge branch 'pw/post-commit-from-sequencer' 2019-11-10 18:02:12 +09:00
sequencer.h Merge branch 'pw/post-commit-from-sequencer' 2019-11-10 18:02:12 +09:00
serve.c
serve.h
server-info.c
setup.c
sh-i18n--envsubst.c
sha1-array.c
sha1-array.h
sha1-file.c Merge branch 'bc/object-id-part17' 2019-10-11 14:24:46 +09:00
sha1-lookup.c Merge branch 'js/azure-pipelines-msvc' 2019-10-15 13:48:00 +09:00
sha1-lookup.h
sha1-name.c
sha1dc_git.c
sha1dc_git.h
shallow.c Merge branch 'rs/dedup-includes' 2019-10-11 14:24:48 +09:00
shell.c
shortlog.h
sideband.c
sideband.h
sigchain.c
sigchain.h
split-index.c
split-index.h
stable-qsort.c
strbuf.c
strbuf.h
streaming.c
streaming.h
string-list.c
string-list.h
sub-process.c
sub-process.h
submodule-config.c
submodule-config.h
submodule.c
submodule.h
symlinks.c
tag.c
tag.h
tar.h
tempfile.c
tempfile.h
thread-utils.c
thread-utils.h
tmp-objdir.c
tmp-objdir.h
trace.c
trace.h
trace2.c
trace2.h
trailer.c
trailer.h
transport-helper.c Merge branch 'bc/smart-http-atomic-push' 2019-10-23 14:43:11 +09:00
transport-internal.h
transport.c transport: push codepath can take arbitrary repository 2019-10-08 13:20:01 +09:00
transport.h remote-curl: pass on atomic capability to remote side 2019-10-17 16:08:22 +09:00
tree-diff.c
tree-walk.c
tree-walk.h
tree.c
tree.h
unicode-width.h
unimplemented.sh
unix-socket.c
unix-socket.h
unpack-trees.c
unpack-trees.h
upload-pack.c
upload-pack.h
url.c
url.h
urlmatch.c
urlmatch.h
usage.c
userdiff.c userdiff: fix some corner cases in dts regex 2019-10-21 17:44:12 +09:00
userdiff.h
utf8.c utf8: use ARRAY_SIZE() in git_wcwidth() 2019-10-12 10:57:39 +09:00
utf8.h
varint.c
varint.h
version.c
version.h
versioncmp.c
walker.c
walker.h
wildmatch.c
wildmatch.h
worktree.c
worktree.h
wrap-for-bin.sh
wrapper.c Merge branch 'ah/cleanups' 2019-10-09 14:01:00 +09:00
write-or-die.c
ws.c
wt-status.c Merge branch 'bc/object-id-part17' 2019-10-11 14:24:46 +09:00
wt-status.h
xdiff-interface.c
xdiff-interface.h
zlib.c

README.md

Build Status

Git - fast, scalable, distributed revision control system

Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.

See Documentation/gittutorial.txt to get started, then see Documentation/giteveryday.txt for a useful minimum set of commands, and Documentation/git-<commandname>.txt for documentation of each command. If git has been correctly installed, then the tutorial can also be read with man gittutorial or git help tutorial, and the documentation of each command with man git-<commandname> or git help <commandname>.

CVS users may also want to read Documentation/gitcvs-migration.txt (man gitcvs-migration or git help cvs-migration if git is installed).

The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission). To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org. The mailing list archives are available at https://public-inbox.org/git/, http://marc.info/?l=git and other archival sites.

Issues which are security relevant should be disclosed privately to the Git Security mailing list git-security@googlegroups.com.

The maintainer frequently sends the "What's cooking" reports that list the current status of various development topics to the mailing list. The discussion following them give a good reference for project status, development direction and remaining tasks.

The name "git" was given by Linus Torvalds when he wrote the very first version. He described the tool as "the stupid content tracker" and the name as (depending on your mood):

  • random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant.
  • stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
  • "global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
  • "goddamn idiotic truckload of sh*t": when it breaks