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view tests/test-bundle-type.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 | 89630d0b3e23 |
children | 8d72e29ad1e0 |
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bundle w/o type option $ hg init t1 $ hg init t2 $ cd t1 $ echo blablablablabla > file.txt $ hg ci -Ama adding file.txt $ hg log | grep summary summary: a $ hg bundle ../b1 ../t2 searching for changes 1 changesets found $ cd ../t2 $ hg unbundle ../b1 adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files new changesets c35a0f9217e6 (1 drafts) (run 'hg update' to get a working copy) $ hg up 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg log | grep summary summary: a $ cd .. Unknown compression type is rejected $ hg init t3 $ cd t3 $ hg -q unbundle ../b1 $ hg bundle -a -t unknown out.hg abort: unknown is not a recognized bundle specification (see 'hg help bundlespec' for supported values for --type) [255] $ hg bundle -a -t unknown-v2 out.hg abort: unknown compression is not supported (see 'hg help bundlespec' for supported values for --type) [255] $ cd .. test bundle types $ testbundle() { > echo % test bundle type $1 > hg init t$1 > cd t1 > hg bundle -t $1 ../b$1 ../t$1 > f -q -B6 -D ../b$1; echo > cd ../t$1 > hg debugbundle ../b$1 > hg debugbundle --spec ../b$1 > echo > cd .. > } $ for t in "None" "bzip2" "gzip" "none-v2" "v2" "v1" "gzip-v1"; do > testbundle $t > done % test bundle type None searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {} changegroup -- {nbchanges: 1, version: 02} (mandatory: True) c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf cache:rev-branch-cache -- {} (mandatory: False) none-v2 % test bundle type bzip2 searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {Compression: BZ} changegroup -- {nbchanges: 1, version: 02} (mandatory: True) c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf cache:rev-branch-cache -- {} (mandatory: False) bzip2-v2 % test bundle type gzip searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {Compression: GZ} changegroup -- {nbchanges: 1, version: 02} (mandatory: True) c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf cache:rev-branch-cache -- {} (mandatory: False) gzip-v2 % test bundle type none-v2 searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {} changegroup -- {nbchanges: 1, version: 02} (mandatory: True) c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf cache:rev-branch-cache -- {} (mandatory: False) none-v2 % test bundle type v2 searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {Compression: BZ} changegroup -- {nbchanges: 1, version: 02} (mandatory: True) c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf cache:rev-branch-cache -- {} (mandatory: False) bzip2-v2 % test bundle type v1 searching for changes 1 changesets found HG10BZ c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf bzip2-v1 % test bundle type gzip-v1 searching for changes 1 changesets found HG10GZ c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf gzip-v1 Compression level can be adjusted for bundle2 bundles $ hg init test-complevel $ cd test-complevel $ cat > file0 << EOF > this is a file > with some text > and some more text > and other content > EOF $ cat > file1 << EOF > this is another file > with some other content > and repeated, repeated, repeated, repeated content > EOF $ hg -q commit -A -m initial $ hg bundle -a -t gzip-v2 gzip-v2.hg 1 changesets found $ f --size gzip-v2.hg gzip-v2.hg: size=468 $ hg --config experimental.bundlecomplevel=1 bundle -a -t gzip-v2 gzip-v2-level1.hg 1 changesets found $ f --size gzip-v2-level1.hg gzip-v2-level1.hg: size=475 $ hg --config experimental.bundlecomplevel.gzip=1 --config experimental.bundlelevel=9 bundle -a -t gzip-v2 gzip-v2-level1.hg 1 changesets found $ f --size gzip-v2-level1.hg gzip-v2-level1.hg: size=475 $ cd .. #if zstd $ for t in "zstd" "zstd-v2"; do > testbundle $t > done % test bundle type zstd searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {Compression: ZS} changegroup -- {nbchanges: 1, version: 02} (mandatory: True) c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf cache:rev-branch-cache -- {} (mandatory: False) zstd-v2 % test bundle type zstd-v2 searching for changes 1 changesets found HG20\x00\x00 (esc) Stream params: {Compression: ZS} changegroup -- {nbchanges: 1, version: 02} (mandatory: True) c35a0f9217e65d1fdb90c936ffa7dbe679f83ddf cache:rev-branch-cache -- {} (mandatory: False) zstd-v2 Explicit request for zstd on non-generaldelta repos $ hg --config format.usegeneraldelta=false init nogd $ hg -q -R nogd pull t1 $ hg -R nogd bundle -a -t zstd nogd-zstd 1 changesets found zstd-v1 always fails $ hg -R tzstd bundle -a -t zstd-v1 zstd-v1 abort: compression engine zstd is not supported on v1 bundles (see 'hg help bundlespec' for supported values for --type) [255] #else zstd is a valid engine but isn't available $ hg -R t1 bundle -a -t zstd irrelevant.hg abort: compression engine zstd could not be loaded [255] #endif test garbage file $ echo garbage > bgarbage $ hg init tgarbage $ cd tgarbage $ hg pull ../bgarbage pulling from ../bgarbage abort: ../bgarbage: not a Mercurial bundle [255] $ cd .. test invalid bundle type $ cd t1 $ hg bundle -a -t garbage ../bgarbage abort: garbage is not a recognized bundle specification (see 'hg help bundlespec' for supported values for --type) [255] $ cd ..