i18n: cache the result of every gettext call
In looking at profiler output for 'hg log' on mozilla-central, I
noticed we spent a _huge_ amount of time in gettext relative to what
it's doing. Caching provides a roughly 15% performance improvement
even on repositories as small as hg.
== hg repo on linux ==
Before:
% cumulative self
time seconds seconds name
5.05 0.19 0.19 i18n.py:62:gettext
4.84 0.18 0.18 revlog.py:88:decompress
2.95 0.17 0.11 changelog.py:201:node
2.32 0.09 0.09 ui.py:577:write
2.11 0.08 0.08 i18n.py:72:gettext
2.11 0.08 0.08 obsolete.py:196:_fm0readmarkers
1.89 0.07 0.07 obsolete.py:569:_load
1.68 0.63 0.06 localrepo.py:29:__get__
real 0m4.026s
user 0m3.993s
sys 0m0.034s
After:
% cumulative self
time seconds seconds name
8.05 0.26 0.26 revlog.py:88:decompress
2.68 0.22 0.09 color.py:395:write
2.20 0.07 0.07 obsolete.py:196:_fm0readmarkers
1.95 0.06 0.06 obsolete.py:174:_fm0readmarkers
1.95 0.06 0.06 ui.py:577:write
1.95 0.06 0.06 util.py:1228:datestr
1.71 0.06 0.06 utf_8.py:16:decode
1.71 0.06 0.06 revlog.py:273:__len__
real 0m3.519s
user 0m3.447s
sys 0m0.073s
== mozilla-central repo on linux ==
Before:
% cumulative self
time seconds seconds name
7.72 2.35 2.35 revlog.py:88:decompress
4.46 1.36 1.36 i18n.py:62:gettext
2.22 0.67 0.67 i18n.py:72:gettext
2.19 1.14 0.67 changelog.py:201:node
2.16 0.66 0.66 ui.py:577:write
1.96 0.60 0.60 utf_8.py:16:decode
1.93 1.97 0.59 color.py:395:write
1.85 0.81 0.56 changelog.py:136:tip
real 0m30.822s
user 0m30.660s
sys 0m0.149s
After:
% cumulative self
time seconds seconds name
9.82 2.49 2.49 revlog.py:88:decompress
2.67 1.31 0.68 localrepo.py:29:__get__
2.57 0.65 0.65 utf_8.py:16:decode
2.48 1.01 0.63 changelog.py:201:node
2.10 0.82 0.53 changelog.py:136:tip
2.01 0.51 0.51 ui.py:577:write
1.91 0.49 0.49 util.py:1232:datestr
1.85 1.65 0.47 color.py:395:write
real 0m25.619s
user 0m25.446s
sys 0m0.166s
== cpython repo on os x =
Before:
% cumulative self
time seconds seconds name
5.05 1.35 1.35 cmdutil.py:982:_show
4.59 1.22 1.22 revlog.py:274:__len__
3.98 1.06 1.06 i18n.py:62:gettext
3.91 1.04 1.04 revlog.py:1016:revision
3.68 0.98 0.98 revlog.py:337:parents
3.45 0.92 0.92 revlog.py:88:decompress
2.91 0.78 0.78 revlog.py:309:rev
2.62 0.70 0.70 revlog.py:1033:revision
real 0m30.414s
user 0m28.145s
sys 0m0.541s
After:
% cumulative self
time seconds seconds name
7.98 1.66 1.66 cmdutil.py:982:_show
6.83 1.42 1.42 changelog.py:46:decodeextra
5.18 1.08 1.08 revlog.py:274:__len__
3.94 0.82 0.82 revlog.py:1016:revision
3.41 0.71 0.71 revlog.py:309:rev
3.32 0.69 0.69 revlog.py:88:decompress
2.99 0.63 0.62 revlog.py:1033:revision
2.69 0.56 0.56 revlog.py:341:start
real 0m22.811s
user 0m21.883s
sys 0m0.397s
syntax: glob
*.elc
*.tmp
*.orig
*.rej
*~
*.mergebackup
*.o
*.so
*.dll
*.exe
*.pyd
*.pyc
*.pyo
*$py.class
*.swp
*.prof
*.zip
\#*\#
.\#*
tests/.coverage*
tests/annotated
tests/*.err
tests/htmlcov
build
contrib/hgsh/hgsh
contrib/vagrant/.vagrant
dist
packages
doc/common.txt
doc/*.[0-9]
doc/*.[0-9].txt
doc/*.[0-9].gendoc.txt
doc/*.[0-9].{x,ht}ml
MANIFEST
MANIFEST.in
patches
mercurial/__version__.py
mercurial/hgpythonlib.h
mercurial.egg-info
.DS_Store
tags
cscope.*
.idea/*
i18n/hg.pot
locale/*/LC_MESSAGES/hg.mo
hgext/__index__.py
# files installed with a local --pure build
mercurial/base85.py
mercurial/bdiff.py
mercurial/diffhelpers.py
mercurial/mpatch.py
mercurial/osutil.py
mercurial/parsers.py
syntax: regexp
^\.pc/
^\.(pydev)?project
# hackable windows distribution additions
^hg-python
^hg.py$