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view tests/test-merge10.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> |
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date | Tue, 16 Apr 2019 01:16:39 +0200 |
parents | faa49a5914bb |
children |
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Test for changeset 9fe267f77f56ff127cf7e65dc15dd9de71ce8ceb (merge correctly when all the files in a directory are moved but then local changes are added in the same directory) $ hg init a $ cd a $ mkdir -p testdir $ echo a > testdir/a $ hg add testdir/a $ hg commit -m a $ cd .. $ hg clone a b updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd a $ echo alpha > testdir/a $ hg commit -m remote-change $ cd .. $ cd b $ mkdir testdir/subdir $ hg mv testdir/a testdir/subdir/a $ hg commit -m move $ mkdir newdir $ echo beta > newdir/beta $ hg add newdir/beta $ hg commit -m local-addition $ hg pull ../a pulling from ../a searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (+1 heads) new changesets cc7000b01af9 (run 'hg heads' to see heads, 'hg merge' to merge) $ hg up -C 2 0 files updated, 0 files merged, 0 files removed, 0 files unresolved Abuse this test for also testing that merge respects ui.relative-paths $ hg --cwd testdir merge --config ui.relative-paths=yes merging subdir/a and a to subdir/a 0 files updated, 1 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg stat M testdir/subdir/a $ hg diff --nodates diff -r bc21c9773bfa testdir/subdir/a --- a/testdir/subdir/a +++ b/testdir/subdir/a @@ -1,1 +1,1 @@ -a +alpha $ cd ..