Mercurial > hg
view tests/test-update-names.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 | c8514f858788 |
children |
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Test update logic when there are renames or weird same-name cases between dirs and files Update with local changes across a file rename $ hg init r1 && cd r1 $ echo a > a $ hg add a $ hg ci -m a $ hg mv a b $ hg ci -m rename $ echo b > b $ hg ci -m change $ hg up -q 0 $ echo c > a $ hg up merging a and b to b warning: conflicts while merging b! (edit, then use 'hg resolve --mark') 0 files updated, 0 files merged, 0 files removed, 1 files unresolved use 'hg resolve' to retry unresolved file merges [1] Test update when local untracked directory exists with the same name as a tracked file in a commit we are updating to $ hg init r2 && cd r2 $ echo root > root && hg ci -Am root # rev 0 adding root $ echo text > name && hg ci -Am "name is a file" # rev 1 adding name $ hg up 0 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ mkdir name $ hg up 1 1 files updated, 0 files merged, 0 files removed, 0 files unresolved Test update when local untracked directory exists with some files in it and has the same name a tracked file in a commit we are updating to. In future this should be updated to give an friendlier error message, but now we should just make sure that this does not erase untracked data $ hg up 0 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ mkdir name $ echo text > name/file $ hg st ? name/file $ hg up 1 abort: Unlinking directory not permitted: *$TESTTMP/r1/r2/name* (glob) (windows !) abort: Directory not empty: '?\$TESTTMP/r1/r2/name'? (re) (no-windows !) [255] $ cat name/file text $ cd .. #if symlink Test update when two commits have symlinks that point to different folders $ hg init r3 && cd r3 $ echo root > root && hg ci -Am root adding root $ mkdir folder1 && mkdir folder2 $ ln -s folder1 folder $ hg ci -Am "symlink to folder1" adding folder $ rm folder $ ln -s folder2 folder $ hg ci -Am "symlink to folder2" $ hg up 1 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd .. #endif #if rmcwd Test that warning is printed if cwd is deleted during update $ hg init r4 && cd r4 $ mkdir dir $ cd dir $ echo a > a $ echo b > b $ hg add a b $ hg ci -m "file and dir" $ hg up -q null current directory was removed (consider changing to repo root: $TESTTMP/r1/r4) #endif