stream-clone: disable gc for `_entries_walk` duration
The number of small container created turn Python in a gc-frenzy that seriously
impact performance.
This significantly boost performance. The following number comes from a large
private repository using perf::stream-locked-section:
base-line: 35.04 seconds
prev-change: 24.51 seconds (-30%)
this-change: 20.88 seconds (-40% from baseline; -15% from previous changes)
#testcases dirstate-v1 dirstate-v2
#if dirstate-v2
$ cat >> $HGRCPATH << EOF
> [format]
> use-dirstate-v2=1
> [storage]
> dirstate-v2.slow-path=allow
> EOF
#endif
The proliferation of status implementations can be confusing:
- The pure python implementation:
(no-rhg pure !)
- The C implementation:
(no-rhg no-rust no-pure !)
- The two rust implementations:
(rhg !)
(no-rhg rust !)
$ hg init repo1
$ cd repo1
$ mkdir d1
$ touch d1/x
$ hg commit -Am.
adding d1/x
$ touch d1/y
$ chmod -r d1
$ hg status
d1: $EACCES$
! d1/x (rhg !)
! d1/x (no-rhg rust !)
$ hg status
d1: $EACCES$
! d1/x (rust !)
! d1/x (no-rust rhg !)
$ chmod +r d1
$ hg status
? d1/y
$ touch d1/z
$ hg status
? d1/y
? d1/z