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view tests/test-purge.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 | c70bdd222dcd |
children | 9f8eddd2723f |
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$ cat <<EOF >> $HGRCPATH > [extensions] > purge = > EOF init $ hg init t $ cd t setup $ echo r1 > r1 $ hg ci -qAmr1 -d'0 0' $ mkdir directory $ echo r2 > directory/r2 $ hg ci -qAmr2 -d'1 0' $ echo 'ignored' > .hgignore $ hg ci -qAmr3 -d'2 0' delete an empty directory $ mkdir empty_dir $ hg purge -p -v empty_dir $ hg purge -v removing directory empty_dir $ ls directory r1 delete an untracked directory $ mkdir untracked_dir $ touch untracked_dir/untracked_file1 $ touch untracked_dir/untracked_file2 $ hg purge -p untracked_dir/untracked_file1 untracked_dir/untracked_file2 $ hg purge -v removing file untracked_dir/untracked_file1 removing file untracked_dir/untracked_file2 removing directory untracked_dir $ ls directory r1 delete an untracked file $ touch untracked_file $ touch untracked_file_readonly $ "$PYTHON" <<EOF > import os > import stat > f = 'untracked_file_readonly' > os.chmod(f, stat.S_IMODE(os.stat(f).st_mode) & ~stat.S_IWRITE) > EOF $ hg purge -p untracked_file untracked_file_readonly $ hg purge -v removing file untracked_file removing file untracked_file_readonly $ ls directory r1 delete an untracked file in a tracked directory $ touch directory/untracked_file $ hg purge -p directory/untracked_file $ hg purge -v removing file directory/untracked_file $ ls directory r1 delete nested directories $ mkdir -p untracked_directory/nested_directory $ hg purge -p untracked_directory/nested_directory $ hg purge -v removing directory untracked_directory/nested_directory removing directory untracked_directory $ ls directory r1 delete nested directories from a subdir $ mkdir -p untracked_directory/nested_directory $ cd directory $ hg purge -p untracked_directory/nested_directory $ hg purge -v removing directory untracked_directory/nested_directory removing directory untracked_directory $ cd .. $ ls directory r1 delete only part of the tree $ mkdir -p untracked_directory/nested_directory $ touch directory/untracked_file $ cd directory $ hg purge -p ../untracked_directory untracked_directory/nested_directory $ hg purge -v ../untracked_directory removing directory untracked_directory/nested_directory removing directory untracked_directory $ cd .. $ ls directory r1 $ ls directory/untracked_file directory/untracked_file $ rm directory/untracked_file skip ignored files if --all not specified $ touch ignored $ hg purge -p $ hg purge -v $ ls directory ignored r1 $ hg purge -p --all ignored $ hg purge -v --all removing file ignored $ ls directory r1 abort with missing files until we support name mangling filesystems $ touch untracked_file $ rm r1 hide error messages to avoid changing the output when the text changes $ hg purge -p 2> /dev/null untracked_file $ hg st ! r1 ? untracked_file $ hg purge -p untracked_file $ hg purge -v 2> /dev/null removing file untracked_file $ hg st ! r1 $ hg purge -v $ hg revert --all --quiet $ hg st -a tracked file in ignored directory (issue621) $ echo directory >> .hgignore $ hg ci -m 'ignore directory' $ touch untracked_file $ hg purge -p untracked_file $ hg purge -v removing file untracked_file skip excluded files $ touch excluded_file $ hg purge -p -X excluded_file $ hg purge -v -X excluded_file $ ls directory excluded_file r1 $ rm excluded_file skip files in excluded dirs $ mkdir excluded_dir $ touch excluded_dir/file $ hg purge -p -X excluded_dir $ hg purge -v -X excluded_dir $ ls directory excluded_dir r1 $ ls excluded_dir file $ rm -R excluded_dir skip excluded empty dirs $ mkdir excluded_dir $ hg purge -p -X excluded_dir $ hg purge -v -X excluded_dir $ ls directory excluded_dir r1 $ rmdir excluded_dir skip patterns $ mkdir .svn $ touch .svn/foo $ mkdir directory/.svn $ touch directory/.svn/foo $ hg purge -p -X .svn -X '*/.svn' $ hg purge -p -X re:.*.svn $ rm -R .svn directory r1 only remove files $ mkdir -p empty_dir dir $ touch untracked_file dir/untracked_file $ hg purge -p --files dir/untracked_file untracked_file $ hg purge -v --files removing file dir/untracked_file removing file untracked_file $ ls dir empty_dir $ ls dir only remove dirs $ mkdir -p empty_dir dir $ touch untracked_file dir/untracked_file $ hg purge -p --dirs empty_dir $ hg purge -v --dirs removing directory empty_dir $ ls dir untracked_file $ ls dir untracked_file remove both files and dirs $ mkdir -p empty_dir dir $ touch untracked_file dir/untracked_file $ hg purge -p --files --dirs dir/untracked_file untracked_file empty_dir $ hg purge -v --files --dirs removing file dir/untracked_file removing file untracked_file removing directory empty_dir removing directory dir $ ls $ cd ..