Mercurial > hg
annotate CONTRIBUTORS @ 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 | c29efd272395 |
children |
rev | line source |
---|---|
5514
c29efd272395
Add note to CONTRIBUTORS file
Matt Mackall <mpm@selenic.com>
parents:
2947
diff
changeset
|
1 [This file is here for historical purposes, all recent contributors |
c29efd272395
Add note to CONTRIBUTORS file
Matt Mackall <mpm@selenic.com>
parents:
2947
diff
changeset
|
2 should appear in the changelog directly] |
c29efd272395
Add note to CONTRIBUTORS file
Matt Mackall <mpm@selenic.com>
parents:
2947
diff
changeset
|
3 |
c29efd272395
Add note to CONTRIBUTORS file
Matt Mackall <mpm@selenic.com>
parents:
2947
diff
changeset
|
4 Andrea Arcangeli <andrea at suse.de> |
519 | 5 Thomas Arendsen Hein <thomas at intevation.de> |
6 Goffredo Baroncelli <kreijack at libero.it> | |
756
5d79dfa5e98f
Added new code contributors, fixed Vincent's name, added hint on encoding.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
594
diff
changeset
|
7 Muli Ben-Yehuda <mulix at mulix.org> |
5d79dfa5e98f
Added new code contributors, fixed Vincent's name, added hint on encoding.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
594
diff
changeset
|
8 Mikael Berthe <mikael at lilotux.net> |
1450 | 9 Benoit Boissinot <bboissin at gmail.com> |
2947
2d865068f72e
Add self to contributors
Brendan Cully <brendan@kublai.com>
parents:
2162
diff
changeset
|
10 Brendan Cully <brendan at kublai.com> |
519 | 11 Vincent Danjean <vdanjean.ml at free.fr> |
12 Jake Edge <jake at edge2.net> | |
13 Michael Fetterman <michael.fetterman at intel.com> | |
14 Edouard Gomez <ed.gomez at free.fr> | |
1231 | 15 Eric Hopper <hopper at omnifarious.org> |
756
5d79dfa5e98f
Added new code contributors, fixed Vincent's name, added hint on encoding.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
594
diff
changeset
|
16 Alecs King <alecsk at gmail.com> |
1310
7e8a55c9ee5c
Updated CONTRIBUTORS.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
1231
diff
changeset
|
17 Volker Kleinfeld <Volker.Kleinfeld at gmx.de> |
519 | 18 Vadim Lebedev <vadim at mbdsys.com> |
19 Christopher Li <hg at chrisli.org> | |
20 Chris Mason <mason at suse.com> | |
2162
dac432a521d8
Add self to CONTRIBUTORS
Colin McMillen <mcmillen@cs.cmu.edu>
parents:
2120
diff
changeset
|
21 Colin McMillen <mcmillen at cs.cmu.edu> |
1080
253072f39205
Updated list of contributors.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
896
diff
changeset
|
22 Wojciech Milkowski <wmilkowski at interia.pl> |
756
5d79dfa5e98f
Added new code contributors, fixed Vincent's name, added hint on encoding.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
594
diff
changeset
|
23 Chad Netzer <chad.netzer at gmail.com> |
519 | 24 Bryan O'Sullivan <bos at serpentine.com> |
756
5d79dfa5e98f
Added new code contributors, fixed Vincent's name, added hint on encoding.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
594
diff
changeset
|
25 Vicent Seguí Pascual <vseguip at gmail.com> |
5d79dfa5e98f
Added new code contributors, fixed Vincent's name, added hint on encoding.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
594
diff
changeset
|
26 Sean Perry <shaleh at speakeasy.net> |
594 | 27 Nguyen Anh Quynh <aquynh at gmail.com> |
1310
7e8a55c9ee5c
Updated CONTRIBUTORS.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
1231
diff
changeset
|
28 Ollivier Robert <roberto at keltia.freenix.fr> |
2120
c0994047c5ff
Added my name to the contributors list.
Alexander Schremmer <alex AT alexanderweb DOT de>
parents:
1450
diff
changeset
|
29 Alexander Schremmer <alex at alexanderweb.de> |
519 | 30 Arun Sharma <arun at sharma-home.net> |
1231 | 31 Josef "Jeff" Sipek <jeffpc at optonline.net> |
1310
7e8a55c9ee5c
Updated CONTRIBUTORS.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
1231
diff
changeset
|
32 Kevin Smith <yarcs at qualitycode.com> |
1231 | 33 TK Soh <teekaysoh at yahoo.com> |
519 | 34 Radoslaw Szkodzinski <astralstorm at gorzow.mm.pl> |
851
73a432c8040a
Added Samuel Tardieu to contributors list.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
760
diff
changeset
|
35 Samuel Tardieu <sam at rfc1149.net> |
519 | 36 K Thananchayan <thananck at yahoo.com> |
37 Andrew Thompson <andrewkt at aktzero.com> | |
38 Michael S. Tsirkin <mst at mellanox.co.il> | |
39 Rafael Villar Burke <pachi at mmn-arquitectos.com> | |
855
a107c64c76be
Added Tristan Wibberley to contributors.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
851
diff
changeset
|
40 Tristan Wibberley <tristan at wibberley.org> |
756
5d79dfa5e98f
Added new code contributors, fixed Vincent's name, added hint on encoding.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
594
diff
changeset
|
41 Mark Williamson <mark.williamson at cl.cam.ac.uk> |