Mercurial > hg
view tests/test-cat.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 | 34ba47117164 |
children | 55c6ebd11cb9 |
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$ hg init $ echo 0 > a $ echo 0 > b $ hg ci -A -m m adding a adding b $ hg rm a $ hg cat a 0 $ hg cat --decode a # more tests in test-encode 0 $ echo 1 > b $ hg ci -m m $ echo 2 > b $ hg cat -r 0 a 0 $ hg cat -r 0 b 0 $ hg cat -r 1 a a: no such file in rev 7040230c159c [1] $ hg cat -r 1 b 1 Test multiple files $ echo 3 > c $ hg ci -Am addmore c $ hg cat b c 1 3 $ hg cat . 1 3 $ hg cat . c 1 3 Test fileset $ hg cat 'set:not(b) or a' 3 $ hg cat 'set:c or b' 1 3 $ mkdir tmp $ hg cat --output tmp/HH_%H c $ hg cat --output tmp/RR_%R c $ hg cat --output tmp/h_%h c $ hg cat --output tmp/r_%r c $ hg cat --output tmp/%s_s c $ hg cat --output tmp/%d%%_d c $ hg cat --output tmp/%p_p c $ hg log -r . --template "{rev}: {node|short}\n" 2: 45116003780e $ find tmp -type f | sort tmp/.%_d tmp/HH_45116003780e3678b333fb2c99fa7d559c8457e9 tmp/RR_2 tmp/c_p tmp/c_s tmp/h_45116003780e tmp/r_2 Test template output $ hg --cwd tmp cat ../b ../c -T '== {path|relpath} ({path}) r{rev} ==\n{data}' == ../b (b) r2 == 1 == ../c (c) r2 == 3 $ hg cat b c -Tjson --output - [ { "data": "1\n", "path": "b" }, { "data": "3\n", "path": "c" } ] $ hg cat b c -Tjson --output 'tmp/%p.json' $ cat tmp/b.json [ { "data": "1\n", "path": "b" } ] $ cat tmp/c.json [ { "data": "3\n", "path": "c" } ] Test working directory $ echo b-wdir > b $ hg cat -r 'wdir()' b b-wdir Environment variables are not visible by default $ PATTERN='t4' hg log -r '.' -T "{ifcontains('PATTERN', envvars, 'yes', 'no')}\n" no Environment variable visibility can be explicit $ PATTERN='t4' hg log -r '.' -T "{envvars % '{key} -> {value}\n'}" \ > --config "experimental.exportableenviron=PATTERN" PATTERN -> t4 Test behavior of output when directory structure does not already exist $ mkdir foo $ echo a > foo/a $ hg add foo/a $ hg commit -qm "add foo/a" $ hg cat --output "output/%p" foo/a $ cat output/foo/a a