store: optimize fncache._write by direncoding the contents in one go
For a netbeans clone on Windows 7 x64:
Before:
$ hg perffncachewrite
! wall 0.210000 comb 0.218401 user 0.202801 sys 0.015600 (best of 47)
After:
$ hg perffncachewrite
! wall 0.104000 comb 0.109201 user 0.078000 sys 0.031200 (best of 95)
--- a/mercurial/store.py Sun Sep 16 11:41:02 2012 +0200
+++ b/mercurial/store.py Mon Sep 17 08:58:35 2012 +0200
@@ -348,7 +348,7 @@
def _write(self, files, atomictemp):
fp = self.opener('fncache', mode='wb', atomictemp=atomictemp)
if files:
- fp.write('\n'.join(map(encodedir, files)) + '\n')
+ fp.write(encodedir('\n'.join(files) + '\n'))
fp.close()
self._dirty = False