Mercurial > hg
view tests/test-mq-qrename.t @ 22778:80f2b63dd83a
parsers: add a function to efficiently lowercase ASCII strings
We need a way to efficiently lowercase ASCII strings. For example, 'hg status'
needs to build up the fold map -- a map from a canonical case (for OS X,
lowercase) to the actual case of each file and directory in the dirstate.
The current way we do that is to try decoding to ASCII and then calling
lower() on the string, labeled 'orig' below:
str.decode('ascii')
return str.lower()
This is pretty inefficient, and it turns out we can do much better.
I also tested out a condition-based approach, labeled 'cond' below:
(c >= 'A' && c <= 'Z') ? (c + ('a' - 'A')) : c
'cond' turned out to be slower in all cases. A 256-byte lookup table with
invalid values for everything past 127 performed similarly, but this was less
verbose.
On OS X 10.9 with LLVM version 6.0 (clang-600.0.51), the asciilower function
was run against two corpuses.
Corpus 1 (list of files from real-world repo, > 100k files):
orig: wall 0.428567 comb 0.430000 user 0.430000 sys 0.000000 (best of 24)
cond: wall 0.077204 comb 0.070000 user 0.070000 sys 0.000000 (best of 100)
lookup: wall 0.060714 comb 0.060000 user 0.060000 sys 0.000000 (best of 100)
Corpus 2 (mozilla-central, 113k files):
orig: wall 0.238406 comb 0.240000 user 0.240000 sys 0.000000 (best of 42)
cond: wall 0.040779 comb 0.040000 user 0.040000 sys 0.000000 (best of 100)
lookup: wall 0.037623 comb 0.040000 user 0.040000 sys 0.000000 (best of 100)
On a Linux server-class machine with GCC 4.4.6 20120305 (Red Hat 4.4.6-4):
Corpus 1 (real-world repo, > 100k files):
orig: wall 0.260899 comb 0.260000 user 0.260000 sys 0.000000 (best of 38)
cond: wall 0.054818 comb 0.060000 user 0.060000 sys 0.000000 (best of 100)
lookup: wall 0.048489 comb 0.050000 user 0.050000 sys 0.000000 (best of 100)
Corpus 2 (mozilla-central, 113k files):
orig: wall 0.153082 comb 0.150000 user 0.150000 sys 0.000000 (best of 65)
cond: wall 0.031007 comb 0.040000 user 0.040000 sys 0.000000 (best of 100)
lookup: wall 0.028793 comb 0.030000 user 0.030000 sys 0.000000 (best of 100)
SSE instructions might help even more, but I didn't experiment with those.
author | Siddharth Agarwal <sid0@fb.com> |
---|---|
date | Fri, 03 Oct 2014 18:42:39 -0700 |
parents | 3f948469bac0 |
children | 2963d5c9d90b |
line wrap: on
line source
$ echo "[extensions]" >> $HGRCPATH $ echo "mq=" >> $HGRCPATH $ hg init a $ cd a $ echo 'base' > base $ hg ci -Ambase adding base $ hg qnew -mmqbase mqbase $ hg qrename mqbase renamed $ mkdir .hg/patches/foo $ hg qrename renamed foo $ hg qseries foo/renamed $ ls .hg/patches/foo renamed $ mkdir .hg/patches/bar $ hg qrename foo/renamed bar $ hg qseries bar/renamed $ ls .hg/patches/bar renamed $ hg qrename bar/renamed baz $ hg qseries baz $ ls .hg/patches/baz .hg/patches/baz $ hg qrename baz new/dir $ hg qseries new/dir $ ls .hg/patches/new/dir .hg/patches/new/dir $ cd .. Test patch being renamed before committed: $ hg init b $ cd b $ hg qinit -c $ hg qnew x $ hg qrename y $ hg qcommit -m rename $ cd .. Test overlapping renames (issue2388) $ hg init c $ cd c $ hg qinit -c $ echo a > a $ hg add adding a $ hg qnew patcha $ echo b > b $ hg add adding b $ hg qnew patchb $ hg ci --mq -m c1 $ hg qrename patchb patchc $ hg qrename patcha patchb $ hg st --mq M series A patchb A patchc R patcha $ cd .. Test renames with mq repo (issue2097) $ hg init issue2097 $ cd issue2097 $ hg qnew p0 $ (cd .hg/patches && hg init) $ hg qren p0 p1 $ hg debugstate --mq $ hg ci --mq -mq0 nothing changed [1] $ cd .. Test renaming to a folded patch (issue3058) $ hg init issue3058 $ cd issue3058 $ hg init --mq $ echo a > a $ hg add a $ hg qnew adda $ echo b >> a $ hg qnew addb $ hg qpop popping addb now at: adda $ hg ci --mq -m "save mq" $ hg qfold addb $ hg qmv addb $ cat .hg/patches/addb # HG changeset patch # Parent 0000000000000000000000000000000000000000 diff -r 000000000000 a --- /dev/null * (glob) +++ b/a * (glob) @@ -0,0 +1,2 @@ +a +b $ cd ..