mirror of
https://github.com/git/git.git
synced 2025-04-03 16:11:07 +00:00
b95c5ada99
Benchmarks in the hot cache case:
before:
$ perf stat --repeat=5 git log -Sqwerty
Performance counter stats for 'git log -Sqwerty' (5 runs):
47,092,744 cache-misses # 2.825 M/sec ( +- 1.607% )
123,368,389 cache-references # 7.400 M/sec ( +- 0.812% )
330,040,998 branch-misses # 3.134 % ( +- 0.257% )
10,530,896,750 branches # 631.663 M/sec ( +- 0.121% )
62,037,201,030 instructions # 1.399 IPC ( +- 0.142% )
44,331,294,321 cycles # 2659.073 M/sec ( +- 0.326% )
96,794 page-faults # 0.006 M/sec ( +- 11.952% )
25 CPU-migrations # 0.000 M/sec ( +- 25.266% )
1,424 context-switches # 0.000 M/sec ( +- 0.540% )
16671.708650 task-clock-msecs # 0.997 CPUs ( +- 0.343% )
16.728692052 seconds time elapsed ( +- 0.344% )
after:
$ perf stat --repeat=5 git log -Sqwerty
Performance counter stats for 'git log -Sqwerty' (5 runs):
51,385,522 cache-misses # 4.619 M/sec ( +- 0.565% )
129,177,880 cache-references # 11.611 M/sec ( +- 0.219% )
319,222,775 branch-misses # 6.946 % ( +- 0.134% )
4,595,913,233 branches # 413.086 M/sec ( +- 0.112% )
31,395,042,533 instructions # 1.062 IPC ( +- 0.129% )
29,558,348,598 cycles # 2656.740 M/sec ( +- 0.204% )
93,224 page-faults # 0.008 M/sec ( +- 4.487% )
19 CPU-migrations # 0.000 M/sec ( +- 10.425% )
950 context-switches # 0.000 M/sec ( +- 0.360% )
11125.796039 task-clock-msecs # 0.997 CPUs ( +- 0.239% )
11.164216599 seconds time elapsed ( +- 0.240% )
So the kwset code is about 33% faster.
Signed-off-by: Fredrik Kuivinen <frekui@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
////////////////////////////////////////////////////////////////
GIT - the stupid content tracker
////////////////////////////////////////////////////////////////
"git" can mean anything, 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
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.
It was originally written by Linus Torvalds with help of a group of
hackers around the net. It is currently maintained by Junio C Hamano.
Please read the file INSTALL for installation instructions.
See Documentation/gittutorial.txt to get started, then see
Documentation/everyday.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).
Many Git online resources are accessible from http://git-scm.com/
including full documentation and Git related tools.
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. 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
http://marc.theaimsgroup.com/?l=git and other archival sites.
The messages titled "A note from the maintainer", "What's in
git.git (stable)" and "What's cooking in git.git (topics)" and
the discussion following them on the mailing list give a good
reference for project status, development direction and
remaining tasks.