dirstate._walkexplicit: don't bother normalizing '.'
The overwhelmingly common case is running commands like 'hg diff' with no
arguments. Therefore the only file that'll be listed is the root directory.
Normalizing that's just a waste of time.
This means that for a plain 'hg diff' we'll never need to construct the
foldmap, saving us a significant chunk of time.
On case-insensitive HFS+ on OS X, for a large repository with over 200,000
files, this brings down 'hg diff' from 2.97 seconds to 2.36.
--- a/mercurial/dirstate.py Sun Mar 29 23:28:30 2015 -0700
+++ b/mercurial/dirstate.py Sun Mar 29 18:28:48 2015 -0700
@@ -634,7 +634,9 @@
alldirs = None
for ff in files:
- if normalize:
+ # constructing the foldmap is expensive, so don't do it for the
+ # common case where files is ['.']
+ if normalize and ff != '.':
nf = normalize(ff, False, True)
else:
nf = ff