Mercurial > hg
view tests/test-remotefilelog-pull-noshallow.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 | 52fbf8a9907c |
children |
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#require no-windows $ . "$TESTDIR/remotefilelog-library.sh" Set up an extension to make sure remotefilelog clientsetup() runs unconditionally even if we have never used a local shallow repo. This mimics behavior when using remotefilelog with chg. clientsetup() can be triggered due to a shallow repo, and then the code can later interact with non-shallow repositories. $ cat > setupremotefilelog.py << EOF > from mercurial import extensions > def extsetup(ui): > remotefilelog = extensions.find(b'remotefilelog') > remotefilelog.onetimeclientsetup(ui) > EOF Set up the master repository to pull from. $ hg init master $ cd master $ cat >> .hg/hgrc <<EOF > [remotefilelog] > server=True > EOF $ echo x > x $ hg commit -qAm x $ cd .. $ hg clone ssh://user@dummy/master child -q We should see the remotefilelog capability here, which advertises that the server supports our custom getfiles method. $ cd master $ echo 'hello' | hg -R . serve --stdio | grep capa | identifyrflcaps exp-remotefilelog-ssh-getfiles-1 x_rfl_getfile x_rfl_getflogheads $ echo 'capabilities' | hg -R . serve --stdio | identifyrflcaps ; echo exp-remotefilelog-ssh-getfiles-1 x_rfl_getfile x_rfl_getflogheads Pull to the child repository. Use our custom setupremotefilelog extension to ensure that remotefilelog.onetimeclientsetup() gets triggered. (Without using chg it normally would not be run in this case since the local repository is not shallow.) $ echo y > y $ hg commit -qAm y $ cd ../child $ hg pull --config extensions.setuprfl=$TESTTMP/setupremotefilelog.py pulling from ssh://user@dummy/master searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files new changesets d34c38483be9 (run 'hg update' to get a working copy) $ hg up 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cat y y Test that bundle works in a non-remotefilelog repo w/ remotefilelog loaded $ echo y >> y $ hg commit -qAm "modify y" $ hg bundle --base ".^" --rev . mybundle.hg --config extensions.setuprfl=$TESTTMP/setupremotefilelog.py 1 changesets found $ cd ..