Mercurial > hg
view tests/test-narrow-clone-no-ellipsis.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 | a0886a4d6dce |
children | 6cc269bd1c29 |
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$ . "$TESTDIR/narrow-library.sh" $ hg init master $ cd master $ mkdir dir $ mkdir dir/src $ cd dir/src $ for x in `$TESTDIR/seq.py 20`; do echo $x > "f$x"; hg add "f$x"; hg commit -m "Commit src $x"; done $ cd .. $ mkdir tests $ cd tests $ for x in `$TESTDIR/seq.py 20`; do echo $x > "t$x"; hg add "t$x"; hg commit -m "Commit test $x"; done $ cd ../../.. narrow clone a file, f10 $ hg clone --narrow ssh://user@dummy/master narrow --noupdate --include "dir/src/f10" requesting all changes adding changesets adding manifests adding file changes added 40 changesets with 1 changes to 1 files new changesets *:* (glob) $ cd narrow $ cat .hg/requires | grep -v generaldelta dotencode fncache narrowhg-experimental revlogv1 sparserevlog store testonly-simplestore (reposimplestore !) $ hg tracked I path:dir/src/f10 $ hg update 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ find * | sort dir dir/src dir/src/f10 $ cat dir/src/f10 10 $ cd .. narrow clone a directory, tests/, except tests/t19 $ hg clone --narrow ssh://user@dummy/master narrowdir --noupdate --include "dir/tests/" --exclude "dir/tests/t19" requesting all changes adding changesets adding manifests adding file changes added 40 changesets with 19 changes to 19 files new changesets *:* (glob) $ cd narrowdir $ hg tracked I path:dir/tests X path:dir/tests/t19 $ hg update 19 files updated, 0 files merged, 0 files removed, 0 files unresolved $ find * | sort dir dir/tests dir/tests/t1 dir/tests/t10 dir/tests/t11 dir/tests/t12 dir/tests/t13 dir/tests/t14 dir/tests/t15 dir/tests/t16 dir/tests/t17 dir/tests/t18 dir/tests/t2 dir/tests/t20 dir/tests/t3 dir/tests/t4 dir/tests/t5 dir/tests/t6 dir/tests/t7 dir/tests/t8 dir/tests/t9 $ cd .. narrow clone everything but a directory (tests/) $ hg clone --narrow ssh://user@dummy/master narrowroot --noupdate --exclude "dir/tests" requesting all changes adding changesets adding manifests adding file changes added 40 changesets with 20 changes to 20 files new changesets *:* (glob) $ cd narrowroot $ hg tracked I path:. X path:dir/tests $ hg update 20 files updated, 0 files merged, 0 files removed, 0 files unresolved $ find * | sort dir dir/src dir/src/f1 dir/src/f10 dir/src/f11 dir/src/f12 dir/src/f13 dir/src/f14 dir/src/f15 dir/src/f16 dir/src/f17 dir/src/f18 dir/src/f19 dir/src/f2 dir/src/f20 dir/src/f3 dir/src/f4 dir/src/f5 dir/src/f6 dir/src/f7 dir/src/f8 dir/src/f9 $ cd .. Testing the --narrowspec flag to clone $ cat >> narrowspecs <<EOF > %include foo > [include] > path:dir/tests/ > path:dir/src/f12 > EOF $ hg clone ssh://user@dummy/master specfile --narrowspec narrowspecs reading narrowspec from '$TESTTMP/narrowspecs' abort: cannot specify other files using '%include' in narrowspec [255] $ cat > narrowspecs <<EOF > [include] > path:dir/tests/ > path:dir/src/f12 > EOF $ hg clone ssh://user@dummy/master specfile --narrowspec narrowspecs reading narrowspec from '$TESTTMP/narrowspecs' requesting all changes adding changesets adding manifests adding file changes added 40 changesets with 21 changes to 21 files new changesets 681085829a73:26ce255d5b5d updating to branch default 21 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd specfile $ hg tracked I path:dir/src/f12 I path:dir/tests $ cd ..