Mercurial > hg
view tests/test-remotefilelog-pull-noshallow.t @ 44363:f7459da77f23
nodemap: introduce an option to use mmap to read the nodemap mapping
The performance and memory benefit is much greater if we don't have to copy all
the data in memory for each information. So we introduce an option (on by
default) to read the data using mmap.
This changeset is the last one definition the API for index support nodemap
data. (they have to be able to use the mmaping).
Below are some benchmark comparing the best we currently have in 5.3 with the
final step of this series (using the persistent nodemap implementation in
Rust). The benchmark run `hg perfindex` with various revset and the following
variants:
Before:
* do not use the persistent nodemap
* use the CPython implementation of the index for nodemap
* use mmapping of the changelog index
After:
* use the MixedIndex Rust code, with the NodeTree object for nodemap access
(still in review)
* use the persistent nodemap data from disk
* access the persistent nodemap data through mmap
* use mmapping of the changelog index
The persistent nodemap greatly speed up most operation on very large
repositories. Some of the previously very fast lookup end up a bit slower because
the persistent nodemap has to be setup. However the absolute slowdown is very
small and won't matters in the big picture.
Here are some numbers (in seconds) for the reference copy of mozilla-try:
Revset Before After abs-change speedup
-10000: 0.004622 0.005532 0.000910 × 0.83
-10: 0.000050 0.000132 0.000082 × 0.37
tip 0.000052 0.000085 0.000033 × 0.61
0 + (-10000:) 0.028222 0.005337 -0.022885 × 5.29
0 0.023521 0.000084 -0.023437 × 280.01
(-10000:) + 0 0.235539 0.005308 -0.230231 × 44.37
(-10:) + :9 0.232883 0.000180 -0.232703 ×1293.79
(-10000:) + (:99) 0.238735 0.005358 -0.233377 × 44.55
:99 + (-10000:) 0.317942 0.005593 -0.312349 × 56.84
:9 + (-10:) 0.313372 0.000179 -0.313193 ×1750.68
:9 0.316450 0.000143 -0.316307 ×2212.93
On smaller repositories, the cost of nodemap related operation is not as big, so
the win is much more modest. Yet it helps shaving a handful of millisecond here
and there.
Here are some numbers (in seconds) for the reference copy of mercurial:
Revset Before After abs-change speedup
-10: 0.000065 0.000097 0.000032 × 0.67
tip 0.000063 0.000078 0.000015 × 0.80
0 0.000561 0.000079 -0.000482 × 7.10
-10000: 0.004609 0.003648 -0.000961 × 1.26
0 + (-10000:) 0.005023 0.003715 -0.001307 × 1.35
(-10:) + :9 0.002187 0.000108 -0.002079 ×20.25
(-10000:) + 0 0.006252 0.003716 -0.002536 × 1.68
(-10000:) + (:99) 0.006367 0.003707 -0.002660 × 1.71
:9 + (-10:) 0.003846 0.000110 -0.003736 ×34.96
:9 0.003854 0.000099 -0.003755 ×38.92
:99 + (-10000:) 0.007644 0.003778 -0.003866 × 2.02
Differential Revision: https://phab.mercurial-scm.org/D7894
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Tue, 11 Feb 2020 11:18:52 +0100 |
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 ..