6fae3aaf22
Add a rather trivial "spatchcache", with this running e.g.: make cocciclean make contrib/coccinelle/free.cocci.patch \ SPATCH=contrib/coccicheck/spatchcache \ SPATCH_FLAGS=--very-quiet Is cut down from ~20s to ~5s on my system. Much of that is either fixable shell overhead, or the around 40 files we "CANTCACHE" (see the implementation). This uses "redis" as a cache by default, but it's configurable. See the embedded documentation. This is *not* like ccache in that we won't cache failed spatch invocations, or those where spatch suggests changes for us. Those cases are so rare that I didn't think it was worth the bother, by far the most common case is that it has no suggested changes. We'll also refuse to cache any "spatch" invocation that has output on stderr, which means that "--very-quiet" must be added to "SPATCH_FLAGS". Because we narrow the cache to that we don't need to save away stdout, stderr & the exit code. We simply cache the cases where we had no suggested changes. Another benchmark is to compare this with the previous SPATCH_BATCH_SIZE=N, as noted in [1]. Before this (on my 8 core system) running: make clean; time make contrib/coccinelle/array.cocci.patch SPATCH_BATCH_SIZE=0 Would take 33s, but with the preceding changes running without this "spatchcache" is slightly slower, or around 35s: make clean; time make contrib/coccinelle/array.cocci.patch Now doing the same with SPATCH=contrib/coccinelle/spatchcache will take around 6s, but we'll need to compile the *.o files first to take full advantage of it (which can be fast with "ccache"): make clean; make; time make contrib/coccinelle/array.cocci.patch SPATCH=contrib/coccinelle/spatchcache 1. https://lore.kernel.org/git/YwdRqP1CyUAzCEn2@coredump.intra.peff.net/ Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Taylor Blau <me@ttaylorr.com> |
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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-<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 and Documentation/CodingGuidelines).
Those wishing to help with error message, usage and informational message
string translations (localization l10) should see po/README.md
(a po file is a Portable Object file that holds the translations).
To subscribe to the list, send an email with just "subscribe git" in the body to majordomo@vger.kernel.org (not the Git list). The mailing list archives are available at https://lore.kernel.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