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Johannes Schindelin b819f1d2ce ci: parallelize testing on Windows
The fact that Git's test suite is implemented in Unix shell script that
is as portable as we can muster, combined with the fact that Unix shell
scripting is foreign to Windows (and therefore has to be emulated),
results in pretty abysmal speed of the test suite on that platform, for
pretty much no other reason than that language choice.

For comparison: while the Linux build & test is typically done within
about 8 minutes, the Windows build & test typically lasts about 80
minutes in Azure Pipelines.

To help with that, let's use the Azure Pipeline feature where you can
parallelize jobs, make jobs depend on each other, and pass artifacts
between them.

The tests are distributed using the following heuristic: listing all
test scripts ordered by size in descending order (as a cheap way to
estimate the overall run time), every Nth script is run (where N is the
total number of parallel jobs), starting at the index corresponding to
the parallel job. This slicing is performed by a new function that is
added to the `test-tool`.

To optimize the overall runtime of the entire Pipeline, we need to move
the Windows jobs to the beginning (otherwise there would be a very
decent chance for the Pipeline to be run only the Windows build, while
all the parallel Windows test jobs wait for this single one).

We use Azure Pipelines Artifacts for both the minimal Git for Windows
SDK as well as the built executables, as deduplication and caching close
to the agents makes that really fast. For comparison: while downloading
and unpacking the minimal Git for Windows SDK via PowerShell takes only
one minute (down from anywhere between 2.5 to 7 when using a shallow
clone), uploading it as Pipeline Artifact takes less than 30s and
downloading and unpacking less than 20s (sometimes even as little as
only twelve seconds).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-01-29 09:26:47 -08:00
.github
block-sha1
builtin Merge branch 'js/gc-repack-close-before-remove' 2019-01-18 13:49:57 -08:00
ci ci: parallelize testing on Windows 2019-01-29 09:26:47 -08:00
compat mingw: be more generous when wrapping up the setitimer() emulation 2019-01-29 09:26:46 -08:00
contrib Merge branch 'mm/multimail-1.5' 2019-01-18 13:49:55 -08:00
Documentation Third batch after 2.20 2019-01-18 13:56:54 -08:00
ewah
git-gui
gitk-git
gitweb
mergetools
negotiator
perl
po
ppc
refs
sha1collisiondetection@232357eb2e
sha1dc
t ci: parallelize testing on Windows 2019-01-29 09:26:47 -08:00
templates
vcs-svn
xdiff
.clang-format
.editorconfig
.gitattributes Merge branch 'ds/hash-independent-tests-fix' into maint 2018-12-15 12:24:32 +09:00
.gitignore
.gitmodules
.mailmap
.travis.yml
.tsan-suppressions
abspath.c
aclocal.m4
advice.c
advice.h
alias.c
alias.h
alloc.c
alloc.h
apply.c Merge branch 'nd/checkout-noisy' 2019-01-14 15:29:29 -08:00
apply.h
archive-tar.c
archive-zip.c
archive.c Merge branch 'nd/indentation-fix' 2019-01-14 15:29:32 -08:00
archive.h
argv-array.c
argv-array.h
attr.c Merge branch 'nd/i18n' 2019-01-04 13:33:31 -08:00
attr.h
azure-pipelines.yml ci: parallelize testing on Windows 2019-01-29 09:26:47 -08:00
banned.h
base85.c
bisect.c Merge branch 'nd/style-opening-brace' 2019-01-18 13:49:52 -08:00
bisect.h
blame.c
blame.h
blob.c
blob.h
branch.c
branch.h
builtin.h
bulk-checkin.c
bulk-checkin.h
bundle.c Merge branch 'nd/the-index' 2019-01-04 13:33:33 -08:00
bundle.h
cache-tree.c Merge branch 'nd/indentation-fix' 2019-01-14 15:29:32 -08:00
cache-tree.h
cache.h
chdir-notify.c
chdir-notify.h
check_bindir
check-builtins.sh
check-racy.c
checkout.c
checkout.h
color.c
color.h
column.c
column.h
combine-diff.c Merge branch 'nd/the-index' 2019-01-04 13:33:33 -08:00
command-list.txt
commit-graph.c Merge branch 'ds/commit-graph-assert-missing-parents' 2019-01-18 13:49:53 -08:00
commit-graph.h
commit-reach.c
commit-reach.h
commit-slab-decl.h
commit-slab-impl.h
commit-slab.h
commit.c
commit.h
common-main.c
config.c
config.h
config.mak.dev Merge branch 'jk/dev-build-format-security' 2019-01-18 13:49:55 -08:00
config.mak.in
config.mak.uname Merge branch 'rb/hpe' 2019-01-18 13:49:54 -08:00
configure.ac
connect.c
connect.h
connected.c
connected.h
convert.c Merge branch 'nd/style-opening-brace' 2019-01-18 13:49:52 -08:00
convert.h
copy.c
COPYING
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 'nd/style-opening-brace' 2019-01-18 13:49:52 -08:00
diff.h Merge branch 'sb/diff-color-moved-config-option-fixup' 2019-01-14 15:29:31 -08:00
diffcore-break.c
diffcore-delta.c
diffcore-order.c
diffcore-pickaxe.c Merge branch 'tb/log-G-binary' 2019-01-14 15:29:31 -08:00
diffcore-rename.c
diffcore.h
dir-iterator.c
dir-iterator.h
dir.c
dir.h
editor.c
entry.c Merge branch 'nd/checkout-noisy' 2019-01-14 15:29:29 -08:00
environment.c Merge branch 'jk/loose-object-cache' 2019-01-04 13:33:32 -08:00
exec-cmd.c
exec-cmd.h
fast-import.c Merge branch 'en/fast-export-import' 2019-01-04 13:33:33 -08:00
fetch-negotiator.c
fetch-negotiator.h
fetch-object.c
fetch-object.h
fetch-pack.c Merge branch 'jk/loose-object-cache' 2019-01-04 13:33:32 -08:00
fetch-pack.h
fmt-merge-msg.h
fsck.c
fsck.h
fsmonitor.c
fsmonitor.h
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 'rb/hpe' 2019-01-18 13:49:54 -08:00
git-cvsexportcommit.perl
git-cvsimport.perl
git-cvsserver.perl
git-difftool--helper.sh
git-filter-branch.sh
git-instaweb.sh
git-legacy-rebase.sh
git-merge-octopus.sh
git-merge-one-file.sh
git-merge-resolve.sh
git-mergetool--lib.sh
git-mergetool.sh
git-p4.py git-p4: fix problem when p4 login is not necessary 2019-01-07 14:23:22 -08:00
git-parse-remote.sh
git-quiltimport.sh git-quiltimport: add --keep-non-patch option 2019-01-07 15:29:34 -08:00
git-rebase--am.sh
git-rebase--common.sh
git-rebase--merge.sh
git-rebase--preserve-merges.sh
git-remote-testgit.sh
git-request-pull.sh
git-send-email.perl
git-sh-i18n.sh
git-sh-setup.sh
git-stash.sh
git-submodule.sh
git-svn.perl
GIT-VERSION-GEN
git-web--browse.sh
git.c Merge branch 'nd/style-opening-brace' 2019-01-18 13:49:52 -08:00
git.rc
gpg-interface.c
gpg-interface.h
graph.c
graph.h
grep.c Merge branch 'nd/the-index' 2019-01-04 13:33:33 -08:00
grep.h
hash.h
hashmap.c
hashmap.h
help.c
help.h
hex.c
http-backend.c Merge branch 'mk/http-backend-kill-children-before-exit' 2019-01-04 13:33:35 -08:00
http-fetch.c
http-push.c
http-walker.c
http.c Merge branch 'jk/loose-object-cache' 2019-01-04 13:33:32 -08:00
http.h
ident.c
imap-send.c
INSTALL
interdiff.c
interdiff.h
iterator.h
json-writer.c
json-writer.h
khash.h
kwset.c
kwset.h
levenshtein.c
levenshtein.h
LGPL-2.1
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 Merge branch 'nd/attr-pathspec-in-tree-walk' 2019-01-14 15:29:28 -08:00
list-objects.h
list.h
ll-merge.c Merge branch 'en/merge-path-collision' 2019-01-04 13:33:32 -08:00
ll-merge.h Merge branch 'en/merge-path-collision' 2019-01-04 13:33:32 -08:00
lockfile.c
lockfile.h
log-tree.c
log-tree.h
ls-refs.c
ls-refs.h
mailinfo.c
mailinfo.h
mailmap.c
mailmap.h
Makefile ci: parallelize testing on Windows 2019-01-29 09:26:47 -08:00
match-trees.c
mem-pool.c
mem-pool.h
merge-blobs.c
merge-blobs.h
merge-recursive.c Merge branch 'nd/attr-pathspec-in-tree-walk' 2019-01-14 15:29:28 -08:00
merge-recursive.h
merge.c
mergesort.c
mergesort.h
midx.c Merge branch 'jk/loose-object-cache' 2019-01-04 13:33:32 -08:00
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 object-store: retire odb_load_loose_cache() 2019-01-08 09:40:19 -08:00
object.c object-store: factor out odb_clear_loose_cache() 2019-01-08 09:40:19 -08:00
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 Merge branch 'nd/the-index' 2019-01-04 13:33:33 -08:00
pack-revindex.c
pack-revindex.h
pack-write.c
pack.h
packfile.c object-store: factor out odb_clear_loose_cache() 2019-01-08 09:40:19 -08:00
packfile.h
pager.c
parse-options-cb.c Merge branch 'nd/i18n' 2019-01-04 13:33:31 -08:00
parse-options.c Merge branch 'nd/indentation-fix' 2019-01-14 15:29:32 -08:00
parse-options.h Merge branch 'nd/indentation-fix' 2019-01-14 15:29:32 -08:00
patch-delta.c
patch-ids.c
patch-ids.h
path.c Merge branch 'jk/loose-object-cache' 2019-01-04 13:33:32 -08:00
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 format-patch: do not let its diff-options affect --range-diff 2018-11-30 13:47:55 +09:00
reachable.c
reachable.h
read-cache.c Merge branch 'nd/indentation-fix' 2019-01-14 15:29:32 -08:00
README.md README: add a build badge (status of the Azure Pipelines build) 2019-01-29 09:26:47 -08:00
rebase-interactive.c
rebase-interactive.h
ref-filter.c Merge branch 'ot/ref-filter-object-info' 2019-01-18 13:49:56 -08:00
ref-filter.h
reflog-walk.c
reflog-walk.h
refs.c
refs.h
refspec.c
refspec.h
RelNotes
remote-curl.c
remote-testsvn.c
remote.c Merge branch 'ab/push-dwim-dst' 2019-01-04 13:33:34 -08:00
remote.h
replace-object.c
replace-object.h
repository.c
repository.h
rerere.c
rerere.h
resolve-undo.c
resolve-undo.h
revision.c Merge branch 'nd/indentation-fix' 2019-01-14 15:29:32 -08:00
revision.h Merge branch 'md/exclude-promisor-objects-fix-cleanup' 2019-01-14 15:29:31 -08:00
run-command.c
run-command.h
send-pack.c
send-pack.h
sequencer.c Merge branch 'so/cherry-pick-always-allow-m1' 2019-01-18 13:49:54 -08:00
sequencer.h Merge branch 'nd/the-index' 2019-01-04 13:33:33 -08:00
serve.c
serve.h
server-info.c
setup.c Simplify handling of setup_git_directory_gently() failure cases. 2019-01-03 10:41:39 -08:00
sh-i18n--envsubst.c
sha1-array.c
sha1-array.h
sha1-file.c Merge branch 'rs/sha1-file-close-mapped-file-on-error' 2019-01-18 13:49:56 -08:00
sha1-lookup.c
sha1-lookup.h
sha1-name.c object-store: factor out odb_loose_cache() 2019-01-08 09:40:19 -08:00
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
trailer.c
trailer.h
transport-helper.c Merge branch 'rb/hpe' 2019-01-18 13:49:54 -08:00
transport-internal.h
transport.c Merge branch 'nd/the-index' 2019-01-04 13:33:33 -08:00
transport.h
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 Merge branch 'nd/checkout-noisy' 2019-01-14 15:29:29 -08:00
unpack-trees.h
upload-pack.c Merge branch 'jt/upload-pack-v2-fix-shallow' 2018-11-06 15:50:19 +09:00
upload-pack.h
url.c
url.h
urlmatch.c
urlmatch.h
usage.c
userdiff.c Merge branch 'nd/style-opening-brace' 2019-01-18 13:49:52 -08:00
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
worktree.h
wrap-for-bin.sh
wrapper.c
write-or-die.c
ws.c
wt-status.c Merge branch 'nd/the-index' 2019-01-04 13:33:33 -08:00
wt-status.h
xdiff-interface.c
xdiff-interface.h
zlib.c

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-.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