store: optimize fncache._load a bit by dirdecoding the contents in one go
For a netbeans clone on Windows 7 x64:
Before:
$ hg perffncacheload
! wall 0.124000 comb 0.124801 user 0.124801 sys 0.000000 (best of 76)
After:
$ hg perffncacheload
! wall 0.096000 comb 0.093601 user 0.078001 sys 0.015600 (best of 97)
$ hg init
$ echo a > a
$ hg add a
$ hg commit -m test
Do we ever miss a sub-second change?:
$ for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
> hg co -qC 0
> echo b > a
> hg st
> done
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a
M a