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view tests/test-inherit-mode.t @ 42743:8c9a6adec67a
rust-discovery: using the children cache in add_missing
The DAG range computation often needs to get back to very old
revisions, and turns out to be disproportionately long, given
that the end goal is to remove the descendents of the given
missing revisons from the undecided set.
The fast iteration capabilities available in the Rust case make
it possible to avoid the DAG range entirely, at the cost of
precomputing the children cache, and to simply iterate on
children of the given missing revisions.
This is a case where staying on the same side of the interface
between the two languages has clear benefits.
On discoveries with initial undecided sets
small enough to bypass sampling entirely, the total cost of
computing the children cache and the subsequent iteration
becomes better than the Python + C counterpart, which relies on
reachableroots2.
For example, on a repo with more than one million revisions with
an initial undecided set of 11 elements, we get these figures:
Rust version with simple iteration
addcommons: 57.287us
first undecided computation: 184.278334ms
first children cache computation: 131.056us
addmissings iteration: 42.766us
first addinfo total: 185.24 ms
Python + C version
first addcommons: 0.29 ms
addcommons 0.21 ms
first undecided computation 191.35 ms
addmissings 45.75 ms
first addinfo total: 237.77 ms
On discoveries with large undecided sets, the initial price paid
makes the first addinfo slower than the Python + C version,
but that's more than compensated by the gain in sampling and
subsequent iterations.
Here's an extreme example with an undecided set of a million revisions:
Rust version:
first undecided computation: 293.842629ms
first children cache computation: 407.911297ms
addmissings iteration: 34.312869ms
first addinfo total: 776.02 ms
taking initial sample
query 2: sampling time: 1318.38 ms
query 2; still undecided: 1005013, sample size is: 200
addmissings: 143.062us
Python + C version:
first undecided computation 298.13 ms
addmissings 80.13 ms
first addinfo total: 399.62 ms
taking initial sample
query 2: sampling time: 3957.23 ms
query 2; still undecided: 1005013, sample size is: 200
addmissings 52.88 ms
Differential Revision: https://phab.mercurial-scm.org/D6428
author | Georges Racinet <georges.racinet@octobus.net> |
---|---|
date | Tue, 16 Apr 2019 01:16:39 +0200 |
parents | e4ac7e63c213 |
children | 3e91d9978bec |
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#require unix-permissions test that new files created in .hg inherit the permissions from .hg/store $ mkdir dir just in case somebody has a strange $TMPDIR $ chmod g-s dir $ cd dir $ cat >printmodes.py <<EOF > from __future__ import absolute_import, print_function > import os > import sys > > allnames = [] > isdir = {} > for root, dirs, files in os.walk(sys.argv[1]): > for d in dirs: > name = os.path.join(root, d) > isdir[name] = 1 > allnames.append(name) > for f in files: > name = os.path.join(root, f) > allnames.append(name) > allnames.sort() > for name in allnames: > suffix = name in isdir and '/' or '' > print('%05o %s%s' % (os.lstat(name).st_mode & 0o7777, name, suffix)) > EOF $ cat >mode.py <<EOF > from __future__ import absolute_import, print_function > import os > import sys > print('%05o' % os.lstat(sys.argv[1]).st_mode) > EOF $ umask 077 $ hg init repo $ cd repo $ chmod 0770 .hg/store .hg/cache .hg/wcache before commit store can be written by the group, other files cannot store is setgid $ "$PYTHON" ../printmodes.py . 00700 ./.hg/ 00600 ./.hg/00changelog.i 00770 ./.hg/cache/ 00600 ./.hg/requires 00770 ./.hg/store/ 00770 ./.hg/wcache/ $ mkdir dir $ touch foo dir/bar $ hg ci -qAm 'add files' after commit working dir files can only be written by the owner files created in .hg can be written by the group (in particular, store/**, dirstate, branch cache file, undo files) new directories are setgid $ "$PYTHON" ../printmodes.py . 00700 ./.hg/ 00600 ./.hg/00changelog.i 00770 ./.hg/cache/ 00660 ./.hg/cache/branch2-served 00660 ./.hg/cache/rbc-names-v1 00660 ./.hg/cache/rbc-revs-v1 00660 ./.hg/dirstate 00660 ./.hg/fsmonitor.state (fsmonitor !) 00660 ./.hg/last-message.txt 00600 ./.hg/requires 00770 ./.hg/store/ 00660 ./.hg/store/00changelog.i 00660 ./.hg/store/00manifest.i 00770 ./.hg/store/data/ 00770 ./.hg/store/data/dir/ 00660 ./.hg/store/data/dir/bar.i (reporevlogstore !) 00660 ./.hg/store/data/foo.i (reporevlogstore !) 00770 ./.hg/store/data/dir/bar/ (reposimplestore !) 00660 ./.hg/store/data/dir/bar/b80de5d138758541c5f05265ad144ab9fa86d1db (reposimplestore !) 00660 ./.hg/store/data/dir/bar/index (reposimplestore !) 00770 ./.hg/store/data/foo/ (reposimplestore !) 00660 ./.hg/store/data/foo/b80de5d138758541c5f05265ad144ab9fa86d1db (reposimplestore !) 00660 ./.hg/store/data/foo/index (reposimplestore !) 00660 ./.hg/store/fncache (repofncache !) 00660 ./.hg/store/phaseroots 00660 ./.hg/store/undo 00660 ./.hg/store/undo.backupfiles 00660 ./.hg/store/undo.phaseroots 00660 ./.hg/undo.backup.dirstate 00660 ./.hg/undo.bookmarks 00660 ./.hg/undo.branch 00660 ./.hg/undo.desc 00660 ./.hg/undo.dirstate 00770 ./.hg/wcache/ 00711 ./.hg/wcache/checkisexec 007.. ./.hg/wcache/checklink (re) 00600 ./.hg/wcache/checklink-target 00660 ./.hg/wcache/manifestfulltextcache (reporevlogstore !) 00700 ./dir/ 00600 ./dir/bar 00600 ./foo $ umask 007 $ hg init ../push before push group can write everything $ "$PYTHON" ../printmodes.py ../push 00770 ../push/.hg/ 00660 ../push/.hg/00changelog.i 00770 ../push/.hg/cache/ 00660 ../push/.hg/requires 00770 ../push/.hg/store/ 00770 ../push/.hg/wcache/ $ umask 077 $ hg -q push ../push after push group can still write everything $ "$PYTHON" ../printmodes.py ../push 00770 ../push/.hg/ 00660 ../push/.hg/00changelog.i 00770 ../push/.hg/cache/ 00660 ../push/.hg/cache/branch2-base 00660 ../push/.hg/dirstate 00660 ../push/.hg/requires 00770 ../push/.hg/store/ 00660 ../push/.hg/store/00changelog.i 00660 ../push/.hg/store/00manifest.i 00770 ../push/.hg/store/data/ 00770 ../push/.hg/store/data/dir/ 00660 ../push/.hg/store/data/dir/bar.i (reporevlogstore !) 00660 ../push/.hg/store/data/foo.i (reporevlogstore !) 00770 ../push/.hg/store/data/dir/bar/ (reposimplestore !) 00660 ../push/.hg/store/data/dir/bar/b80de5d138758541c5f05265ad144ab9fa86d1db (reposimplestore !) 00660 ../push/.hg/store/data/dir/bar/index (reposimplestore !) 00770 ../push/.hg/store/data/foo/ (reposimplestore !) 00660 ../push/.hg/store/data/foo/b80de5d138758541c5f05265ad144ab9fa86d1db (reposimplestore !) 00660 ../push/.hg/store/data/foo/index (reposimplestore !) 00660 ../push/.hg/store/fncache (repofncache !) 00660 ../push/.hg/store/undo 00660 ../push/.hg/store/undo.backupfiles 00660 ../push/.hg/store/undo.phaseroots 00660 ../push/.hg/undo.bookmarks 00660 ../push/.hg/undo.branch 00660 ../push/.hg/undo.desc 00660 ../push/.hg/undo.dirstate 00770 ../push/.hg/wcache/ Test that we don't lose the setgid bit when we call chmod. Not all systems support setgid directories (e.g. HFS+), so just check that directories have the same mode. $ cd .. $ hg init setgid $ cd setgid $ chmod g+rwx .hg/store $ chmod g+s .hg/store 2> /dev/null || true $ mkdir dir $ touch dir/file $ hg ci -qAm 'add dir/file' $ storemode=`"$PYTHON" ../mode.py .hg/store` $ dirmode=`"$PYTHON" ../mode.py .hg/store/data/dir` $ if [ "$storemode" != "$dirmode" ]; then > echo "$storemode != $dirmode" > fi $ cd .. $ cd .. # g-s dir