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Jeff King c291293b2e everything_local: use "quick" object existence check
In b495697b82 (fetch-pack: avoid repeatedly re-scanning pack
directory, 2013-01-26), we noticed that everything_local()
could waste time trying to find and parse objects which we
_expect_ to be missing. The solution was to put
has_sha1_file() in front of parse_object() to skip the
more-expensive parse attempt.

That optimization was negated later when has_sha1_file()
learned to do the same re-scan in 45e8a74873 (has_sha1_file:
re-check pack directory before giving up, 2013-08-30).

We can restore it by using the "quick" flag to tell
has_sha1_file (actually has_object_file these days) that we
prefer speed to thoroughness for this call.  See also the
fixes in 5827a0354 and 0eeb077be7 for prior art and
discussion on using the "quick" flag for these cases.

The recently-added performance regression test in p5551
demonstrates the problem. You can see the original fix:

  Test            b495697b82^       b495697b82
  --------------------------------------------------------
  5551.4: fetch   1.68(1.33+0.35)   0.87(0.69+0.18) -48.2%

and then the regression:

  Test            45e8a74873^       45e8a74873
  ---------------------------------------------------------
  5551.4: fetch   0.96(0.77+0.19)   2.55(2.04+0.50) +165.6%

and now our fix:

  Test            HEAD^             HEAD
  --------------------------------------------------------
  5551.4: fetch   7.21(6.58+0.63)   5.47(5.04+0.43) -24.1%

You can also see that other things have gotten a lot slower
since 2013. We'll deal with those in separate patches.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-21 11:30:41 +09:00
.github
Documentation Git 2.14.3 2017-10-23 14:44:17 +09:00
block-sha1
builtin Merge branch 'jk/write-in-full-fix' into maint 2017-10-23 14:37:22 +09:00
ci travis-ci: fix "skip_branch_tip_with_tag()" string comparison 2017-09-22 10:58:29 +09:00
compat Merge branch 'rb/compat-poll-fix' into maint 2017-10-18 14:19:05 +09:00
contrib Merge branch 'tb/complete-describe' into maint 2017-10-18 14:19:14 +09:00
ewah
git-gui Merge branch 'js/msgfmt-on-windows' of ../git-gui into js/git-gui-msgfmt-on-windows 2017-07-25 13:42:41 -07:00
gitk-git
gitweb Merge branch 'hb/gitweb-project-list' into maint 2017-08-23 14:33:44 -07:00
mergetools
perl Merge branch 'jc/perl-git-comment-typofix' into maint 2017-09-10 17:02:57 +09:00
po l10n: zh_CN: review for git v2.14.0 l10n 2017-08-02 08:02:37 +08:00
ppc
refs convert less-trivial versions of "write_in_full() != len" 2017-09-14 15:17:59 +09:00
sha1collisiondetection@19d97bf5af
sha1dc
t p5551: add a script to test fetch pack-dir rescans 2017-11-21 11:08:20 +09:00
templates
vcs-svn Merge branch 'jn/vcs-svn-cleanup' into maint 2017-09-10 17:03:09 +09:00
xdiff
.gitattributes
.gitignore
.gitmodules
.mailmap .mailmap: normalize name for René Scharfe 2017-10-06 11:31:41 +09:00
.travis.yml travis-ci: move Travis CI code into dedicated scripts 2017-09-11 09:54:08 +09:00
.tsan-suppressions ThreadSanitizer: add suppressions 2017-08-23 10:38:56 -07:00
COPYING
GIT-VERSION-GEN Git 2.14.3 2017-10-23 14:44:17 +09:00
INSTALL
LGPL-2.1
Makefile Merge branch 'jn/vcs-svn-cleanup' into maint 2017-09-10 17:03:09 +09:00
README.md
RelNotes Prepare for 2.14.3 2017-10-18 14:24:09 +09:00
abspath.c
aclocal.m4
advice.c
advice.h
alias.c Merge branch 'js/alias-case-sensitivity' 2017-07-20 16:29:59 -07:00
alloc.c
apply.c Merge branch 'rs/apply-lose-prefix-length' into maint 2017-09-10 17:03:01 +09:00
apply.h apply: remove prefix_length member from apply_state 2017-08-09 10:21:45 -07:00
archive-tar.c
archive-zip.c
archive.c archive: don't add empty directories to archives 2017-09-14 15:08:22 +09:00
archive.h
argv-array.c
argv-array.h
attr.c
attr.h
base85.c
bisect.c
bisect.h
blame.c Merge branch 'js/blame-lib' 2017-07-31 13:05:15 -07:00
blame.h
blob.c
blob.h
branch.c Merge branch 'nd/worktree-kill-parse-ref' into maint 2017-10-23 14:14:16 +09:00
branch.h
builtin.h git.c: provide setup_auto_pager() 2017-08-03 11:08:10 -07:00
bulk-checkin.c
bulk-checkin.h
bundle.c
bundle.h
cache-tree.c use MOVE_ARRAY 2017-07-17 14:54:56 -07:00
cache-tree.h
cache.h cache.h: hex2chr() - avoid -Wsign-compare warnings 2017-09-22 13:00:38 +09:00
check-builtins.sh
check-racy.c
check_bindir
color.c Revert "color: check color.ui in git_default_config()" 2017-10-17 15:09:52 +09:00
color.h
column.c
column.h
combine-diff.c
command-list.txt
commit-slab.h commit-slab.h: avoid -Wsign-compare warnings 2017-09-22 13:00:36 +09:00
commit.c use MOVE_ARRAY 2017-07-17 14:54:56 -07:00
commit.h commit: remove unused inline function single_parent() 2017-08-19 09:24:05 -07:00
common-main.c
config.c Merge branch 'jk/write-in-full-fix' into maint 2017-10-23 14:37:22 +09:00
config.h
config.mak.in
config.mak.uname config.mak.uname: set FREAD_READS_DIRECTORIES for cygwin 2017-07-21 11:58:06 -07:00
configure.ac
connect.c Git 2.13.5 2017-08-04 12:40:37 -07:00
connect.h
connected.c
connected.h
convert.c Merge branch 'ma/ts-cleanups' into maint 2017-10-23 14:19:02 +09:00
convert.h Merge branch 'tb/apply-with-crlf' into maint 2017-09-10 17:02:55 +09:00
copy.c
credential-cache--daemon.c
credential-cache.c Merge branch 'dl/credential-cache-socket-in-xdg-cache' into maint 2017-08-23 14:33:45 -07:00
credential-store.c
credential.c
credential.h
csum-file.c
csum-file.h
ctype.c
daemon.c
date.c
decorate.c
decorate.h
delta.h
diff-delta.c
diff-lib.c
diff-no-index.c
diff.c Merge branch 'jk/write-in-full-fix' into maint 2017-10-23 14:37:22 +09:00
diff.h
diffcore-break.c
diffcore-delta.c
diffcore-order.c
diffcore-pickaxe.c
diffcore-rename.c
diffcore.h
dir-iterator.c
dir-iterator.h
dir.c Merge branch 'rs/stat-data-unaligned-reads-fix' into maint 2017-08-23 14:33:48 -07:00
dir.h
editor.c
entry.c convert less-trivial versions of "write_in_full() != len" 2017-09-14 15:17:59 +09:00
environment.c
exec_cmd.c git_extract_argv0_path: do nothing without RUNTIME_PREFIX 2017-09-07 09:41:14 +09:00
exec_cmd.h
fast-import.c Merge branch 'jk/write-in-full-fix' into maint 2017-10-23 14:37:22 +09:00
fetch-pack.c everything_local: use "quick" object existence check 2017-11-21 11:30:41 +09:00
fetch-pack.h
fmt-merge-msg.h
fsck.c fsck: handle NULL return of lookup_blob() and lookup_tree() 2017-10-06 11:04:34 +09:00
fsck.h
generate-cmdlist.sh
gettext.c
gettext.h
git-add--interactive.perl Merge branch 'pw/unquote-path-in-git-pm' into maint 2017-07-31 13:51:05 -07:00
git-archimport.perl archimport: use safe_pipe_capture for user input 2017-09-12 11:08:15 +09:00
git-bisect.sh
git-compat-util.h git-compat-util.h: xsize_t() - avoid -Wsign-compare warnings 2017-09-22 13:00:33 +09:00
git-cvsexportcommit.perl
git-cvsimport.perl cvsimport: shell-quote variable used in backticks 2017-09-12 11:10:22 +09:00
git-cvsserver.perl cvsserver: use safe_pipe_capture for `constant commands` as well 2017-09-11 14:52:29 +09:00
git-difftool--helper.sh
git-filter-branch.sh
git-instaweb.sh
git-merge-octopus.sh scripts: use "git foo" not "git-foo" 2017-08-07 12:04:45 -07:00
git-merge-one-file.sh scripts: use "git foo" not "git-foo" 2017-08-07 12:04:45 -07:00
git-merge-resolve.sh scripts: use "git foo" not "git-foo" 2017-08-07 12:04:45 -07:00
git-mergetool--lib.sh
git-mergetool.sh
git-p4.py
git-parse-remote.sh
git-quiltimport.sh
git-rebase--am.sh rebase: honor --rerere-autoupdate 2017-08-02 15:16:09 -07:00
git-rebase--interactive.sh rebase -i: honor --rerere-autoupdate 2017-08-02 15:16:09 -07:00
git-rebase--merge.sh
git-rebase.sh
git-remote-testgit.sh
git-request-pull.sh request-pull: capitalise "Git" to make it a proper noun 2017-10-03 13:11:57 +09:00
git-send-email.perl send-email: don't use Mail::Address, even if available 2017-08-24 14:40:17 -07:00
git-sh-i18n.sh
git-sh-setup.sh
git-stash.sh Merge branch 'mf/no-dashed-subcommands' into maint 2017-09-10 17:02:56 +09:00
git-submodule.sh Merge branch 'sb/submodule-parallel-update' into maint 2017-09-10 17:03:06 +09:00
git-svn.perl
git-web--browse.sh
git.c git.c: ignore pager.* when launching builtin as dashed external 2017-08-03 11:08:11 -07:00
git.rc
gpg-interface.c
gpg-interface.h
graph.c
graph.h
grep.c Merge branch 'as/grep-quiet-no-match-exit-code-fix' into maint 2017-09-10 17:02:55 +09:00
grep.h
hash.h
hashmap.c
hashmap.h
help.c
help.h
hex.c
http-backend.c avoid "write_in_full(fd, buf, len) != len" pattern 2017-09-14 15:17:59 +09:00
http-fetch.c
http-push.c http-push: fix construction of hex value from path 2017-10-04 13:48:35 +09:00
http-walker.c
http.c Merge branch 'jc/http-sslkey-and-ssl-cert-are-paths' into maint 2017-08-23 14:33:43 -07:00
http.h
ident.c
imap-send.c
iterator.h
khash.h
kwset.c
kwset.h
levenshtein.c
levenshtein.h
line-log.c ALLOC_GROW: avoid -Wsign-compare warnings 2017-09-22 13:21:11 +09:00
line-log.h ALLOC_GROW: avoid -Wsign-compare warnings 2017-09-22 13:21:11 +09:00
line-range.c
line-range.h
list-objects.c
list-objects.h
list.h
ll-merge.c avoid "write_in_full(fd, buf, len) != len" pattern 2017-09-14 15:17:59 +09:00
ll-merge.h
lockfile.c
lockfile.h
log-tree.c
log-tree.h
mailinfo.c Merge branch 'rs/mailinfo-qp-decode-fix' into maint 2017-10-18 14:19:03 +09:00
mailinfo.h
mailmap.c
mailmap.h
match-trees.c
merge-blobs.c
merge-blobs.h
merge-recursive.c
merge-recursive.h
merge.c
mergesort.c
mergesort.h
mru.c
mru.h
name-hash.c
notes-cache.c
notes-cache.h
notes-merge.c notes-merge: use ssize_t for write_in_full() return value 2017-09-14 15:17:59 +09:00
notes-merge.h
notes-utils.c
notes-utils.h
notes.c
notes.h
object.c object: remove "used" field from struct object 2017-07-20 14:54:08 -07:00
object.h object: remove "used" field from struct object 2017-07-20 14:54:08 -07:00
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
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 'jk/validate-headref-fix' into maint 2017-10-18 14:19:12 +09:00
path.h
pathspec.c
pathspec.h
pkt-line.c Merge branch 'jk/write-in-full-fix' into maint 2017-10-23 14:37:22 +09:00
pkt-line.h sub-process: refactor handshake to common function 2017-07-26 13:00:40 -07:00
preload-index.c
pretty.c
prio-queue.c
prio-queue.h
progress.c
progress.h
prompt.c
prompt.h
quote.c
quote.h
reachable.c
reachable.h
read-cache.c avoid "write_in_full(fd, buf, len) != len" pattern 2017-09-14 15:17:59 +09:00
ref-filter.c ref-filter.c: pass empty-string as NULL to atom parsers 2017-10-05 10:41:57 +09:00
ref-filter.h
reflog-walk.c use MOVE_ARRAY 2017-07-17 14:54:56 -07:00
reflog-walk.h
refs.c Merge branch 'jk/write-in-full-fix' into maint 2017-10-23 14:37:22 +09:00
refs.h refs: strip out not allowed flags from ref_transaction_update 2017-09-14 14:46:05 +09:00
remote-curl.c
remote-testsvn.c
remote.c
remote.h
replace_object.c
repository.c
repository.h
rerere.c avoid "write_in_full(fd, buf, len) != len" pattern 2017-09-14 15:17:59 +09:00
rerere.h
resolve-undo.c
resolve-undo.h
revision.c ALLOC_GROW: avoid -Wsign-compare warnings 2017-09-22 13:21:11 +09:00
revision.h revision: add rev_input_given flag 2017-08-02 15:45:20 -07:00
run-command.c run-command: use ALLOC_ARRAY 2017-10-03 08:42:57 +09:00
run-command.h
send-pack.c
send-pack.h
sequencer.c cherry-pick/revert: remember --rerere-autoupdate 2017-08-02 15:16:09 -07:00
sequencer.h
server-info.c
setup.c
sh-i18n--envsubst.c
sha1-array.c
sha1-array.h
sha1-lookup.c sha1_file: drop experimental GIT_USE_LOOKUP search 2017-08-09 11:03:35 -07:00
sha1-lookup.h sha1-lookup: remove sha1_entry_pos() from header file 2017-08-25 09:54:26 -07:00
sha1_file.c Merge branch 'jk/info-alternates-fix' into maint 2017-10-23 14:40:00 +09:00
sha1_name.c
sha1dc_git.c
sha1dc_git.h
shallow.c avoid "write_in_full(fd, buf, len) != len" pattern 2017-09-14 15:17:59 +09:00
shell.c shell: drop git-cvsserver support by default 2017-09-12 11:05:58 +09:00
shortlog.h
show-index.c
sideband.c
sideband.h
sigchain.c
sigchain.h
split-index.c
split-index.h
strbuf.c Merge branch 'rs/strbuf-getwholeline-fix' into maint 2017-10-18 14:18:58 +09:00
strbuf.h Merge branch 'ma/ts-cleanups' into maint 2017-10-23 14:19:02 +09:00
streaming.c convert less-trivial versions of "write_in_full() != len" 2017-09-14 15:17:59 +09:00
streaming.h
string-list.c use MOVE_ARRAY 2017-07-17 14:54:56 -07:00
string-list.h for_each_string_list_item: avoid undefined behavior for empty list 2017-09-20 14:41:08 +09:00
sub-process.c Merge branch 'cc/subprocess-handshake-missing-capabilities' into maint 2017-10-18 14:19:10 +09:00
sub-process.h sub-process: refactor handshake to common function 2017-07-26 13:00:40 -07:00
submodule-config.c
submodule-config.h
submodule.c Merge branch 'bw/push-options-recursively-to-submodules' into maint 2017-09-10 17:02:49 +09:00
submodule.h submodule.h: typofix 2017-09-22 10:59:52 +09:00
symlinks.c
tag.c tag: avoid NULL pointer arithmetic 2017-10-02 13:14:33 +09:00
tag.h
tar.h
tempfile.c
tempfile.h
thread-utils.c
thread-utils.h
tmp-objdir.c
tmp-objdir.h
trace.c
trace.h
trailer.c
trailer.h
transport-helper.c Merge branch 'jk/write-in-full-fix' into maint 2017-10-23 14:37:22 +09:00
transport.c
transport.h
tree-diff.c
tree-walk.c ALLOC_GROW: avoid -Wsign-compare warnings 2017-09-22 13:21:11 +09:00
tree-walk.h
tree.c
tree.h
unicode_width.h
unimplemented.sh
unix-socket.c
unix-socket.h
unpack-trees.c Merge branch 'ls/filter-process-delayed' into jt/subprocess-handshake 2017-07-26 12:56:19 -07:00
unpack-trees.h
upload-pack.c
url.c
url.h
urlmatch.c
urlmatch.h
usage.c
userdiff.c Merge branch 'ik/userdiff-html-h-element-fix' into maint 2017-10-18 14:19:02 +09:00
userdiff.h
utf8.c
utf8.h
varint.c
varint.h
version.c
version.h
versioncmp.c
walker.c
walker.h
wildmatch.c
wildmatch.h
worktree.c Merge branch 'nd/worktree-kill-parse-ref' into maint 2017-10-23 14:14:16 +09:00
worktree.h
wrap-for-bin.sh
wrapper.c avoid "write_in_full(fd, buf, len) != len" pattern 2017-09-14 15:17:59 +09:00
write_or_die.c
ws.c
wt-status.c
wt-status.h
xdiff-interface.c
xdiff-interface.h
zlib.c

README.md

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-.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.

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