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Ævar Arnfjörð Bjarmason 48de2a768c grep: remove the kwset optimization A later change will replace this optimization with optimistic use of PCRE v2. I'm completely removing it as an intermediate step, as opposed to replacing it with PCRE v2, to demonstrate that no grep semantics depend on this (or any other) optimization for the fixed backend anymore. For now this is mostly (but not entirely) a performance regression, as shown by this hacky one-liner: for opt in '' ' -i' do GIT_PERF_7821_GREP_OPTS=$opt GIT_PERF_REPEAT_COUNT=10 GIT_PERF_LARGE_REPO=~/g/linux GIT_PERF_MAKE_OPTS='-j8 CFLAGS=-O3 USE_LIBPCRE=YesPlease' ./run origin/master HEAD -- p7821-grep-engines-fixed.sh done && for opt in '' ' -i' do GIT_PERF_4221_LOG_OPTS=$opt GIT_PERF_REPEAT_COUNT=10 GIT_PERF_LARGE_REPO=~/g/linux GIT_PERF_MAKE_OPTS='-j8 CFLAGS=-O3 USE_LIBPCRE=YesPlease' ./run origin/master HEAD -- p4221-log-grep-engines-fixed.sh done Which produces: plain grep: Test origin/master HEAD ------------------------------------------------------------------------- 7821.1: fixed grep int 0.55(1.60+0.63) 0.82(3.11+0.51) +49.1% 7821.2: basic grep int 0.62(1.68+0.49) 0.85(3.02+0.52) +37.1% 7821.3: extended grep int 0.61(1.63+0.53) 0.91(3.09+0.44) +49.2% 7821.4: perl grep int 0.55(1.60+0.57) 0.41(0.93+0.57) -25.5% 7821.6: fixed grep uncommon 0.20(0.50+0.44) 0.35(1.27+0.42) +75.0% 7821.7: basic grep uncommon 0.20(0.49+0.45) 0.35(1.29+0.41) +75.0% 7821.8: extended grep uncommon 0.20(0.45+0.48) 0.35(1.25+0.44) +75.0% 7821.9: perl grep uncommon 0.20(0.53+0.41) 0.16(0.24+0.49) -20.0% 7821.11: fixed grep æ 0.35(1.27+0.40) 0.25(0.82+0.39) -28.6% 7821.12: basic grep æ 0.35(1.28+0.38) 0.25(0.75+0.44) -28.6% 7821.13: extended grep æ 0.36(1.21+0.46) 0.25(0.86+0.35) -30.6% 7821.14: perl grep æ 0.35(1.33+0.34) 0.16(0.26+0.47) -54.3% grep with -i: Test origin/master HEAD ----------------------------------------------------------------------------- 7821.1: fixed grep -i int 0.61(1.84+0.64) 1.11(4.12+0.64) +82.0% 7821.2: basic grep -i int 0.72(1.86+0.57) 1.15(4.48+0.49) +59.7% 7821.3: extended grep -i int 0.94(1.83+0.60) 1.53(4.12+0.58) +62.8% 7821.4: perl grep -i int 0.66(1.82+0.59) 0.55(1.08+0.58) -16.7% 7821.6: fixed grep -i uncommon 0.21(0.51+0.44) 0.44(1.74+0.34) +109.5% 7821.7: basic grep -i uncommon 0.21(0.55+0.41) 0.44(1.72+0.40) +109.5% 7821.8: extended grep -i uncommon 0.21(0.57+0.39) 0.42(1.64+0.45) +100.0% 7821.9: perl grep -i uncommon 0.21(0.48+0.48) 0.17(0.30+0.45) -19.0% 7821.11: fixed grep -i æ 0.25(0.73+0.45) 0.25(0.75+0.45) +0.0% 7821.12: basic grep -i æ 0.25(0.71+0.49) 0.26(0.77+0.44) +4.0% 7821.13: extended grep -i æ 0.25(0.75+0.44) 0.25(0.74+0.46) +0.0% 7821.14: perl grep -i æ 0.17(0.26+0.48) 0.16(0.20+0.52) -5.9% plain log: Test origin/master HEAD --------------------------------------------------------------------------------- 4221.1: fixed log --grep='int' 7.31(7.06+0.21) 8.11(7.85+0.20) +10.9% 4221.2: basic log --grep='int' 7.30(6.94+0.27) 8.16(7.89+0.19) +11.8% 4221.3: extended log --grep='int' 7.34(7.05+0.21) 8.08(7.76+0.25) +10.1% 4221.4: perl log --grep='int' 7.27(6.94+0.24) 7.05(6.76+0.25) -3.0% 4221.6: fixed log --grep='uncommon' 6.97(6.62+0.32) 7.86(7.51+0.30) +12.8% 4221.7: basic log --grep='uncommon' 7.05(6.69+0.29) 7.89(7.60+0.28) +11.9% 4221.8: extended log --grep='uncommon' 6.89(6.56+0.32) 7.99(7.66+0.24) +16.0% 4221.9: perl log --grep='uncommon' 7.02(6.66+0.33) 6.97(6.54+0.36) -0.7% 4221.11: fixed log --grep='æ' 7.37(7.03+0.33) 7.67(7.30+0.31) +4.1% 4221.12: basic log --grep='æ' 7.41(7.00+0.31) 7.60(7.28+0.26) +2.6% 4221.13: extended log --grep='æ' 7.35(6.96+0.38) 7.73(7.31+0.34) +5.2% 4221.14: perl log --grep='æ' 7.43(7.10+0.32) 6.95(6.61+0.27) -6.5% log with -i: Test origin/master HEAD ------------------------------------------------------------------------------------ 4221.1: fixed log -i --grep='int' 7.40(7.05+0.23) 8.66(8.38+0.20) +17.0% 4221.2: basic log -i --grep='int' 7.39(7.09+0.23) 8.67(8.39+0.20) +17.3% 4221.3: extended log -i --grep='int' 7.29(6.99+0.26) 8.69(8.31+0.26) +19.2% 4221.4: perl log -i --grep='int' 7.42(7.16+0.21) 7.14(6.80+0.24) -3.8% 4221.6: fixed log -i --grep='uncommon' 6.94(6.58+0.35) 8.43(8.04+0.30) +21.5% 4221.7: basic log -i --grep='uncommon' 6.95(6.62+0.31) 8.34(7.93+0.32) +20.0% 4221.8: extended log -i --grep='uncommon' 7.06(6.75+0.25) 8.32(7.98+0.31) +17.8% 4221.9: perl log -i --grep='uncommon' 6.96(6.69+0.26) 7.04(6.64+0.32) +1.1% 4221.11: fixed log -i --grep='æ' 7.92(7.55+0.33) 7.86(7.44+0.34) -0.8% 4221.12: basic log -i --grep='æ' 7.88(7.49+0.32) 7.84(7.46+0.34) -0.5% 4221.13: extended log -i --grep='æ' 7.91(7.51+0.32) 7.87(7.48+0.32) -0.5% 4221.14: perl log -i --grep='æ' 7.01(6.59+0.35) 6.99(6.64+0.28) -0.3% Some of those, as noted in [1] are because PCRE is faster at finding fixed strings. This looks bad for some engines, but in the next change we'll optimistically use PCRE v2 for all of these, so it'll look better. 1. https://public-inbox.org/git/87v9x793qi.fsf@evledraar.gmail.com/ Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>		2019-07-01 14:33:14 -07:00
.github	…
Documentation	grep: make the behavior for NUL-byte in patterns sane	2019-07-01 14:33:14 -07:00
block-sha1	…
builtin	Merge branch 'jt/partial-clone-missing-ref-delta-base'	2019-06-21 11:24:09 -07:00
ci	…
compat	…
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git-gui	…
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t	grep: drop support for \0 in --fixed-strings <pattern>	2019-07-01 14:33:14 -07:00
templates	…
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GIT-VERSION-GEN	The first batch after 2.22	2019-06-13 13:23:03 -07:00
INSTALL	…
LGPL-2.1	…
Makefile	Merge branch 'ab/deprecate-R-for-dynpath'	2019-06-13 13:19:43 -07:00
README.md	…
RelNotes	The first batch after 2.22	2019-06-13 13:23:03 -07:00
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advice.c	…
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branch.c	Merge branch 'nd/merge-quit'	2019-06-13 13:19:41 -07:00
branch.h	Merge branch 'nd/merge-quit'	2019-06-13 13:19:41 -07:00
builtin.h	…
bulk-checkin.c	…
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check-builtins.sh	…
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commit.c	…
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common-main.c	…
config.c	…
config.h	…
config.mak.dev	…
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configure.ac	…
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convert.c	…
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csum-file.c	…
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ctype.c	…
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date.c	…
decorate.c	…
decorate.h	…
delta-islands.c	…
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delta.h	…
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fmt-merge-msg.h	…
fsck.c	…
fsck.h	…
fsmonitor.c	…
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	…
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git-cvsserver.perl	…
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git-filter-branch.sh	…
git-instaweb.sh	…
git-legacy-stash.sh	…
git-merge-octopus.sh	…
git-merge-one-file.sh	…
git-merge-resolve.sh	…
git-mergetool--lib.sh	…
git-mergetool.sh	…
git-p4.py	Merge branch 'mm/p4-unshelve-windows-fix'	2019-06-17 10:15:19 -07:00
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	Merge branch 'po/git-help-on-git-itself'	2019-06-17 10:15:19 -07:00
git.rc	…
gpg-interface.c	…
gpg-interface.h	…
graph.c	…
graph.h	…
grep.c	grep: remove the kwset optimization	2019-07-01 14:33:14 -07:00
grep.h	grep: remove the kwset optimization	2019-07-01 14:33:14 -07:00
hash.h	…
hashmap.c	…
hashmap.h	…
help.c	Merge branch 'jk/help-unknown-ref-fix'	2019-06-13 13:19:42 -07:00
help.h	…
hex.c	…
http-backend.c	…
http-fetch.c	…
http-push.c	…
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	Merge branch 'md/list-objects-filter-parse-msgfix'	2019-06-21 11:24:10 -07:00
list-objects-filter-options.h	…
list-objects-filter.c	Merge branch 'md/list-objects-filter-memfix'	2019-06-21 11:24:09 -07:00
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-recursive.h	…
merge.c	…
mergesort.c	…
mergesort.h	…
midx.c	…
midx.h	…
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	Merge branch 'ds/object-info-for-prefetch-fix'	2019-06-17 10:15:14 -07:00
object.c	…
object.h	…
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	Merge branch 'mh/import-transport-fd-fix'	2019-06-13 13:19:43 -07:00
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	…
path.h	…
pathspec.c	…
pathspec.h	…
pkt-line.c	…
pkt-line.h	…
preload-index.c	…
pretty.c	…
pretty.h	…
prio-queue.c	…
prio-queue.h	…
progress.c	…
progress.h	…
prompt.c	…
prompt.h	…
protocol.c	…
protocol.h	…
quote.c	…
quote.h	…
range-diff.c	…
range-diff.h	…
reachable.c	…
reachable.h	…
read-cache.c	Merge branch 'js/fsmonitor-unflake'	2019-06-17 10:15:18 -07:00
rebase-interactive.c	…
rebase-interactive.h	…
ref-filter.c	…
ref-filter.h	…
reflog-walk.c	…
reflog-walk.h	…
refs.c	Merge branch 'nd/worktree-name-sanitization'	2019-06-13 13:19:40 -07:00
refs.h	Merge branch 'nd/worktree-name-sanitization'	2019-06-13 13:19:40 -07:00
refspec.c	…
refspec.h	…
remote-curl.c	…
remote-testsvn.c	…
remote.c	…
remote.h	…
replace-object.c	…
replace-object.h	…
repository.c	…
repository.h	…
rerere.c	…
rerere.h	…
resolve-undo.c	…
resolve-undo.h	…
revision.c	grep: don't use PCRE2?_UTF8 with "log --encoding=<non-utf8>"	2019-06-28 09:11:09 -07:00
revision.h	…
run-command.c	…
run-command.h	…
send-pack.c	…
send-pack.h	…
sequencer.c	Merge branch 'pw/rebase-edit-message-for-replayed-merge'	2019-06-13 13:19:43 -07:00
sequencer.h	…
serve.c	…
serve.h	…
server-info.c	Merge branch 'ew/server-info-remove-crufts'	2019-06-17 10:15:15 -07:00
setup.c	…
sh-i18n--envsubst.c	…
sha1-array.c	…
sha1-array.h	…
sha1-file.c	Merge branch 'ds/object-info-for-prefetch-fix'	2019-06-17 10:15:14 -07:00
sha1-lookup.c	…
sha1-lookup.h	…
sha1-name.c	…
sha1dc_git.c	…
sha1dc_git.h	…
shallow.c	…
shell.c	…
shortlog.h	…
sideband.c	…
sideband.h	…
sigchain.c	…
sigchain.h	…
split-index.c	…
split-index.h	…
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 'mh/import-transport-fd-fix'	2019-06-13 13:19:43 -07:00
transport-internal.h	…
transport.c	…
transport.h	…
tree-diff.c	…
tree-walk.c	…
tree-walk.h	…
tree.c	…
tree.h	…
unicode-width.h	Merge branch 'bb/unicode-12.1-reiwa'	2019-06-17 10:15:18 -07:00
unimplemented.sh	…
unix-socket.c	…
unix-socket.h	…
unpack-trees.c	…
unpack-trees.h	…
upload-pack.c	Merge branch 'jk/HEAD-symref-in-xfer-namespaces'	2019-06-17 10:15:15 -07:00
upload-pack.h	…
url.c	…
url.h	…
urlmatch.c	…
urlmatch.h	…
usage.c	…
userdiff.c	Merge branch 'ml/userdiff-rust'	2019-06-21 11:24:08 -07:00
userdiff.h	…
utf8.c	…
utf8.h	…
varint.c	…
varint.h	…
version.c	…
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versioncmp.c	…
walker.c	…
walker.h	…
wildmatch.c	…
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worktree.c	Merge branch 'nd/corrupt-worktrees'	2019-06-13 13:19:41 -07:00
worktree.h	…
wrap-for-bin.sh	…
wrapper.c	…
write-or-die.c	…
ws.c	…
wt-status.c	Merge branch 'jk/unused-params-final-batch'	2019-06-13 13:19:34 -07:00
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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.

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