Mercurial > hg
view tests/test-narrow-clone-nonlinear.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 | a2a6e724d61a |
children |
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Testing narrow clones when changesets modifying a matching file exist on multiple branches $ . "$TESTDIR/narrow-library.sh" $ hg init master $ cd master $ cat >> .hg/hgrc <<EOF > [narrow] > serveellipses=True > EOF $ hg branch default marked working directory as branch default (branches are permanent and global, did you want a bookmark?) $ for x in `$TESTDIR/seq.py 10`; do > echo $x > "f$x" > hg add "f$x" > hg commit -m "Add $x" > done $ hg branch release-v1 marked working directory as branch release-v1 (branches are permanent and global, did you want a bookmark?) $ hg commit -m "Start release for v1" $ hg update default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ for x in `$TESTDIR/seq.py 10`; do > echo "$x v2" > "f$x" > hg commit -m "Update $x to v2" > done $ hg update release-v1 10 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch release-v1 marked working directory as branch release-v1 $ for x in `$TESTDIR/seq.py 1 5`; do > echo "$x v1 hotfix" > "f$x" > hg commit -m "Hotfix $x in v1" > done $ hg update default 10 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch release-v2 marked working directory as branch release-v2 $ hg commit -m "Start release for v2" $ hg update default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch default marked working directory as branch default $ for x in `$TESTDIR/seq.py 10`; do > echo "$x v3" > "f$x" > hg commit -m "Update $x to v3" > done $ hg update release-v2 10 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch release-v2 marked working directory as branch release-v2 $ for x in `$TESTDIR/seq.py 4 9`; do > echo "$x v2 hotfix" > "f$x" > hg commit -m "Hotfix $x in v2" > done $ hg heads -T '{rev} <- {p1rev} ({branch}): {desc}\n' 42 <- 41 (release-v2): Hotfix 9 in v2 36 <- 35 (default): Update 10 to v3 25 <- 24 (release-v1): Hotfix 5 in v1 $ cd .. We now have 3 branches: default, which has v3 of all files, release-v1 which has v1 of all files, and release-v2 with v2 of all files. Narrow clone which should get all branches $ hg clone --narrow ssh://user@dummy/master narrow --include "f5" requesting all changes adding changesets adding manifests adding file changes added 12 changesets with 5 changes to 1 files (+2 heads) new changesets *:* (glob) updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd narrow $ hg log -G -T "{if(ellipsis, '...')}{node|short} ({branch}): {desc}\n" o ...031f516143fe (release-v2): Hotfix 9 in v2 | o 9cd7f7bb9ca1 (release-v2): Hotfix 5 in v2 | o ...37bbc88f3ef0 (release-v2): Hotfix 4 in v2 | | @ ...dae2f368ca07 (default): Update 10 to v3 | | | o 9c224e89cb31 (default): Update 5 to v3 | | | o ...04fb59c7c9dc (default): Update 4 to v3 |/ | o b2253e82401f (release-v1): Hotfix 5 in v1 | | | o ...960ac37d74fd (release-v1): Hotfix 4 in v1 | | o | 986298e3f347 (default): Update 5 to v2 | | o | ...75d539c667ec (default): Update 4 to v2 |/ o 04c71bd5707f (default): Add 5 | o ...881b3891d041 (default): Add 4 Narrow clone the first file, hitting edge condition where unaligned changeset and manifest revnums cross branches. $ hg clone --narrow ssh://user@dummy/master narrow --include "f1" requesting all changes adding changesets adding manifests adding file changes added 10 changesets with 4 changes to 1 files (+2 heads) new changesets *:* (glob) updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd narrow $ hg log -G -T "{if(ellipsis, '...')}{node|short} ({branch}): {desc}\n" o ...031f516143fe (release-v2): Hotfix 9 in v2 | | @ ...dae2f368ca07 (default): Update 10 to v3 | | | o 1f5d184b8e96 (default): Update 1 to v3 |/ | o ...b2253e82401f (release-v1): Hotfix 5 in v1 | | | o 133502f6b7e5 (release-v1): Hotfix 1 in v1 | | o | ...79165c83d644 (default): Update 10 to v2 | | o | c7b7a5f2f088 (default): Update 1 to v2 | | | o ...f0531a3db7a9 (release-v1): Start release for v1 |/ o ...6a3f0f0abef3 (default): Add 10 | o e012ac15eaaa (default): Add 1