status: prefer relative paths in Rust code
… when the repository root is under the current directory,
so the kernel needs to traverse fewer directory in every call
to `read_dir` or `symlink_metadata`.
Better yet would be to use libc functions like `openat` and `fstatat`
to remove such repeated traversals entirely, but the standard library
does not provide APIs based on those.
Maybe with a crate like https://crates.io/crates/openat instead?
Benchmarks of `rhg status` show that this patch is neutral in some configurations,
and makes the command up to ~20% faster in others.
Below is semi-arbitrary subset of results. The four numeric columns are:
time (in seconds) with this changeset’s parent, time with this changeset,
time difference (negative is better), time ratio (less than 1 is better).
```
mercurial-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.0061 -> 0.0059: -0.0002 (0.97)
mercurial-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0029 -> 0.0028: -0.0001 (0.97)
mozilla-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.2110 -> 0.2102: -0.0007 (1.00)
mozilla-dirstate-v2 | default-copies-clean.ignored.pbr | 0.0489 -> 0.0401: -0.0088 (0.82)
mozilla-dirstate-v2 | default-copies-clean.no-iu.pbr | 0.0479 -> 0.0393: -0.0085 (0.82)
mozilla-dirstate-v2 | default-copies-large.all.pbr | 0.1262 -> 0.1210: -0.0051 (0.96)
mozilla-dirstate-v2 | default-copies-small.ignored-unknown.pbr | 0.1262 -> 0.1200: -0.0062 (0.95)
mozilla-dirstate-v2 | default-copies-small.ignored.pbr | 0.0536 -> 0.0417: -0.0119 (0.78)
mozilla-dirstate-v2 | default-copies-small.no-iu.pbr | 0.0482 -> 0.0393: -0.0089 (0.81)
mozilla-dirstate-v2 | default-plain-clean.ignored.pbr | 0.0518 -> 0.0402: -0.0116 (0.78)
mozilla-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0481 -> 0.0392: -0.0088 (0.82)
mozilla-dirstate-v2 | default-plain-large.all.pbr | 0.1271 -> 0.1218: -0.0052 (0.96)
mozilla-dirstate-v2 | default-plain-small.ignored-unknown.pbr | 0.1225 -> 0.1202: -0.0022 (0.98)
mozilla-dirstate-v2 | default-plain-small.ignored.pbr | 0.0510 -> 0.0418: -0.0092 (0.82)
mozilla-dirstate-v2 | default-plain-small.no-iu.pbr | 0.0480 -> 0.0394: -0.0086 (0.82)
netbeans-dirstate-v1 | default-plain-clean.no-iu.pbr | 0.1442 -> 0.1422: -0.0020 (0.99)
netbeans-dirstate-v2 | default-plain-clean.no-iu.pbr | 0.0325 -> 0.0282: -0.0043 (0.87)
```
Differential Revision: https://phab.mercurial-scm.org/D12175
$ hg init test
$ cd test
$ echo foo>foo
$ hg addremove
adding foo
$ hg commit -m "1"
$ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 1 changesets with 1 changes to 1 files
$ hg clone . ../branch
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd ../branch
$ hg co
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo bar>>foo
$ hg commit -m "2" -d '1 0'
$ cd ../test
$ hg pull ../branch
pulling from ../branch
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
new changesets 84b9316f7b31
1 local changesets published
(run 'hg update' to get a working copy)
$ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
checked 2 changesets with 2 changes to 1 files
$ hg co
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat foo
foo
bar
$ hg manifest --debug
6f4310b00b9a147241b071a60c28a650827fb03d 644 foo
update to rev 0 with a date
$ hg upd -d foo 0
abort: you can't specify a revision and a date
[10]
update by date
$ hg update -d '<1970-01-01 00:00:02 +0000'
found revision 1 from Thu Jan 01 00:00:01 1970 +0000
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update -d '<1970-01-01 00:00:01 +0000'
found revision 1 from Thu Jan 01 00:00:01 1970 +0000
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update -d '<1970-01-01 00:00:00 +0000'
found revision 0 from Thu Jan 01 00:00:00 1970 +0000
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update -d '>1970-01-01 00:00:02 +0000'
abort: revision matching date not found
[10]
$ hg update -d '>1970-01-01 00:00:01 +0000'
found revision 1 from Thu Jan 01 00:00:01 1970 +0000
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg update -d '>1970-01-01 00:00:00 +0000'
found revision 1 from Thu Jan 01 00:00:01 1970 +0000
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
update to default destination (with empty revspec)
$ hg update -q null
$ hg update
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg id
84b9316f7b31 tip
$ hg update -q null
$ hg update -r ''
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg id
84b9316f7b31 tip
$ hg update -q null
$ hg update ''
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg id
84b9316f7b31 tip
$ cd ..
update with worker processes
#if no-windows
$ cat <<EOF > forceworker.py
> from mercurial import extensions, worker
> def nocost(orig, ui, costperop, nops, threadsafe=True):
> return worker._numworkers(ui) > 1
> def uisetup(ui):
> extensions.wrapfunction(worker, 'worthwhile', nocost)
> EOF
$ hg init worker
$ cd worker
$ cat <<EOF >> .hg/hgrc
> [extensions]
> forceworker = $TESTTMP/forceworker.py
> [worker]
> numcpus = 4
> EOF
$ for i in `"$PYTHON" $TESTDIR/seq.py 1 100`; do
> echo $i > $i
> done
$ hg ci -qAm 'add 100 files'
$ hg update null
0 files updated, 0 files merged, 100 files removed, 0 files unresolved
$ hg update -v | grep 100
getting 100
100 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg status
$ cd ..
#endif