##// END OF EJS Templates
upstream » mercurial-mirror
RSS

Clone from https://www.mercurial-scm.org/repo/hg-all

xdiff: reduce indent heuristic overhead...
xdiff: reduce indent heuristic overhead Adds some threshold to avoid expensive cases, like: ``` #!python open('a', 'w').write(" \n" * 1000000) open('b', 'w').write(" \n" * 1000001) ``` The indent heuristic is O(N * 20) (N = 1000000) for the above case, and makes diff much slower. Before this patch (system git 2.14.2): ``` git diff --no-indent-heuristic a b 0.21s user 0.03s system 100% cpu 0.239 total git diff --indent-heuristic a b 0.77s user 0.02s system 99% cpu 0.785 total ``` After this patch (git 2fc74f41, with xdiffi.c patched): ``` # with the changed xdiffi.c git diff --indent-heuristic a b 0.16s user 0.01s system 90% cpu 0.188 total git diff --no-indent-heuristic a b 0.18s user 0.01s system 99% cpu 0.192 total ``` Now turning on indent-heuristic has no visible impact on performance. Differential Revision: https://phab.mercurial-scm.org/D2601
Gregory Szorc - - Load All Authors

File last commit:

r30434:2e484bde default
r36692:c4207922 default
Show More
LICENSE
30 lines | 1.5 KiB | text/plain | TextLexer
/ contrib / python-zstandard / zstd / LICENSE
History | Annotation | Raw |Copy content |Copy permalink
BSD License
For Zstandard software
Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name Facebook nor the names of its contributors may be used to
endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.