Mercurial > hg
annotate hgweb.cgi @ 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 | 47ef023d0165 |
children | d58a205d0672 |
rev | line source |
---|---|
202 | 1 #!/usr/bin/env python |
159 | 2 # |
11000
338167735124
hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
6142
diff
changeset
|
3 # An example hgweb CGI script, edit as necessary |
26421
4b0fc75f9403
urls: bulk-change primary website URLs
Matt Mackall <mpm@selenic.com>
parents:
15475
diff
changeset
|
4 # See also https://mercurial-scm.org/wiki/PublishingRepositories |
159 | 5 |
11000
338167735124
hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
6142
diff
changeset
|
6 # Path to repo or hgweb config to serve (see 'hg help hgweb') |
338167735124
hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
6142
diff
changeset
|
7 config = "/path/to/repo/or/config" |
5244
79279b5583c6
cgi: sys.path.insert should be before importing mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
5197
diff
changeset
|
8 |
15475
85cba926cb59
hgweb: add hint about finding library path with debuginstall
Matt Mackall <mpm@selenic.com>
parents:
11503
diff
changeset
|
9 # Uncomment and adjust if Mercurial is not installed system-wide |
85cba926cb59
hgweb: add hint about finding library path with debuginstall
Matt Mackall <mpm@selenic.com>
parents:
11503
diff
changeset
|
10 # (consult "installed modules" path from 'hg debuginstall'): |
43691
47ef023d0165
black: blacken scripts
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26421
diff
changeset
|
11 # import sys; sys.path.insert(0, "/path/to/python/lib") |
5197
55860a45bbf2
Enable demandimport only in scripts, not in importable modules (issue605)
Thomas Arendsen Hein <thomas@intevation.de>
parents:
3868
diff
changeset
|
12 |
6080
4baad19c4801
hgweb: disable cgitb by default
Maxim Dounin <mdounin@mdounin.ru>
parents:
5995
diff
changeset
|
13 # Uncomment to send python tracebacks to the browser if an error occurs: |
43691
47ef023d0165
black: blacken scripts
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26421
diff
changeset
|
14 # import cgitb; cgitb.enable() |
47ef023d0165
black: blacken scripts
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26421
diff
changeset
|
15 |
47ef023d0165
black: blacken scripts
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26421
diff
changeset
|
16 from mercurial import demandimport |
391
5f65a108a559
hgweb: pull cgitb into CGI script example, where it can easily be disabled
mpm@selenic.com
parents:
202
diff
changeset
|
17 |
43691
47ef023d0165
black: blacken scripts
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26421
diff
changeset
|
18 demandimport.enable() |
11000
338167735124
hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
6142
diff
changeset
|
19 from mercurial.hgweb import hgweb, wsgicgi |
43691
47ef023d0165
black: blacken scripts
Gregory Szorc <gregory.szorc@gmail.com>
parents:
26421
diff
changeset
|
20 |
11000
338167735124
hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
6142
diff
changeset
|
21 application = hgweb(config) |
6141
90e5c82a3859
Backed out changeset b913d3aacddc (see issue971/msg5317)
Thomas Arendsen Hein <thomas@intevation.de>
parents:
5995
diff
changeset
|
22 wsgicgi.launch(application) |