Mercurial > hg
view tests/test-remotefilelog-local.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 | 0800d9e6e216 |
children | 5c2a4f37eace |
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#require no-windows $ . "$TESTDIR/remotefilelog-library.sh" $ hg init master $ cd master $ cat >> .hg/hgrc <<EOF > [remotefilelog] > server=True > EOF $ echo x > x $ echo y > y $ echo z > z $ hg commit -qAm xy $ cd .. $ hgcloneshallow ssh://user@dummy/master shallow -q 3 files fetched over 1 fetches - (3 misses, 0.00% hit ratio) over *s (glob) $ cd shallow # status $ clearcache $ echo xx > x $ echo yy > y $ touch a $ hg status M x M y ? a 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob) $ hg add a $ hg status M x M y A a # diff $ hg debugrebuilddirstate # fixes dirstate non-determinism $ hg add a $ clearcache $ hg diff diff -r f3d0bb0d1e48 x --- a/x* (glob) +++ b/x* (glob) @@ -1,1 +1,1 @@ -x +xx diff -r f3d0bb0d1e48 y --- a/y* (glob) +++ b/y* (glob) @@ -1,1 +1,1 @@ -y +yy 3 files fetched over 1 fetches - (3 misses, 0.00% hit ratio) over *s (glob) # local commit $ clearcache $ echo a > a $ echo xxx > x $ echo yyy > y $ hg commit -m a ? files fetched over 1 fetches - (? misses, 0.00% hit ratio) over *s (glob) # local commit where the dirstate is clean -- ensure that we do just one fetch # (update to a commit on the server first) $ hg --config debug.dirstate.delaywrite=1 up 0 2 files updated, 0 files merged, 1 files removed, 0 files unresolved $ clearcache $ hg debugdirstate n 644 2 * x (glob) n 644 2 * y (glob) n 644 2 * z (glob) $ echo xxxx > x $ echo yyyy > y $ hg commit -m x created new head 2 files fetched over 1 fetches - (2 misses, 0.00% hit ratio) over *s (glob) # restore state for future tests $ hg -q strip . $ hg -q up tip # rebase $ clearcache $ cd ../master $ echo w > w $ hg commit -qAm w $ cd ../shallow $ hg pull pulling from ssh://user@dummy/master searching for changes adding changesets adding manifests adding file changes added 1 changesets with 0 changes to 0 files (+1 heads) new changesets fed61014d323 (run 'hg heads' to see heads, 'hg merge' to merge) $ hg rebase -d tip rebasing 1:9abfe7bca547 "a" saved backup bundle to $TESTTMP/shallow/.hg/strip-backup/9abfe7bca547-8b11e5ff-rebase.hg (glob) 3 files fetched over 2 fetches - (3 misses, 0.00% hit ratio) over *s (glob) # strip $ clearcache $ hg debugrebuilddirstate # fixes dirstate non-determinism $ hg strip -r . 2 files updated, 0 files merged, 1 files removed, 0 files unresolved saved backup bundle to $TESTTMP/shallow/.hg/strip-backup/19edf50f4de7-df3d0f74-backup.hg (glob) 4 files fetched over 2 fetches - (4 misses, 0.00% hit ratio) over *s (glob) # unbundle $ clearcache $ ls w x y z $ hg debugrebuilddirstate # fixes dirstate non-determinism $ hg unbundle .hg/strip-backup/19edf50f4de7-df3d0f74-backup.hg adding changesets adding manifests adding file changes added 1 changesets with 0 changes to 0 files new changesets 19edf50f4de7 (1 drafts) (run 'hg update' to get a working copy) $ hg up 3 files updated, 0 files merged, 0 files removed, 0 files unresolved 4 files fetched over 1 fetches - (4 misses, 0.00% hit ratio) over *s (glob) $ cat a a # revert $ clearcache $ hg revert -r .~2 y z no changes needed to z 2 files fetched over 2 fetches - (2 misses, 0.00% hit ratio) over *s (glob) $ hg checkout -C -r . -q # explicit bundle should produce full bundle file $ hg bundle -r 2 --base 1 ../local.bundle 1 changesets found 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob) $ cd .. $ hgcloneshallow ssh://user@dummy/master shallow2 -q 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob) $ cd shallow2 $ hg unbundle ../local.bundle adding changesets adding manifests adding file changes added 1 changesets with 3 changes to 3 files new changesets 19edf50f4de7 (1 drafts) (run 'hg update' to get a working copy) $ hg log -r 2 --stat changeset: 2:19edf50f4de7 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: a a | 1 + x | 2 +- y | 2 +- 3 files changed, 3 insertions(+), 2 deletions(-) # Merge $ echo merge >> w $ hg commit -m w created new head $ hg merge 2 3 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg commit -m merge $ hg strip -q -r ".^" # commit without producing new node $ cd $TESTTMP $ hgcloneshallow ssh://user@dummy/master shallow3 -q $ cd shallow3 $ echo 1 > A $ hg commit -m foo -A A $ hg log -r . -T '{node}\n' 383ce605500277f879b7460a16ba620eb6930b7f $ hg update -r '.^' -q $ echo 1 > A $ hg commit -m foo -A A $ hg log -r . -T '{node}\n' 383ce605500277f879b7460a16ba620eb6930b7f