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rust-discovery: using the children cache in add_missing
The DAG range computation often needs to get back to very old
revisions, and turns out to be disproportionately long, given
that the end goal is to remove the descendents of the given
missing revisons from the undecided set.
The fast iteration capabilities available in the Rust case make
it possible to avoid the DAG range entirely, at the cost of
precomputing the children cache, and to simply iterate on
children of the given missing revisions.
This is a case where staying on the same side of the interface
between the two languages has clear benefits.
On discoveries with initial undecided sets
small enough to bypass sampling entirely, the total cost of
computing the children cache and the subsequent iteration
becomes better than the Python + C counterpart, which relies on
reachableroots2.
For example, on a repo with more than one million revisions with
an initial undecided set of 11 elements, we get these figures:
Rust version with simple iteration
addcommons: 57.287us
first undecided computation: 184.278334ms
first children cache computation: 131.056us
addmissings iteration: 42.766us
first addinfo total: 185.24 ms
Python + C version
first addcommons: 0.29 ms
addcommons 0.21 ms
first undecided computation 191.35 ms
addmissings 45.75 ms
first addinfo total: 237.77 ms
On discoveries with large undecided sets, the initial price paid
makes the first addinfo slower than the Python + C version,
but that's more than compensated by the gain in sampling and
subsequent iterations.
Here's an extreme example with an undecided set of a million revisions:
Rust version:
first undecided computation: 293.842629ms
first children cache computation: 407.911297ms
addmissings iteration: 34.312869ms
first addinfo total: 776.02 ms
taking initial sample
query 2: sampling time: 1318.38 ms
query 2; still undecided: 1005013, sample size is: 200
addmissings: 143.062us
Python + C version:
first undecided computation 298.13 ms
addmissings 80.13 ms
first addinfo total: 399.62 ms
taking initial sample
query 2: sampling time: 3957.23 ms
query 2; still undecided: 1005013, sample size is: 200
addmissings 52.88 ms
Differential Revision: https://phab.mercurial-scm.org/D6428
author | Georges Racinet <georges.racinet@octobus.net> |
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date | Tue, 16 Apr 2019 01:16:39 +0200 |
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1 [This file is here for historical purposes, all recent contributors |
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2 should appear in the changelog directly] |
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3 |
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4 Andrea Arcangeli <andrea at suse.de> |
519 | 5 Thomas Arendsen Hein <thomas at intevation.de> |
6 Goffredo Baroncelli <kreijack at libero.it> | |
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7 Muli Ben-Yehuda <mulix at mulix.org> |
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8 Mikael Berthe <mikael at lilotux.net> |
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10 Brendan Cully <brendan at kublai.com> |
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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> |
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16 Alecs King <alecsk at gmail.com> |
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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> | |
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21 Colin McMillen <mcmillen at cs.cmu.edu> |
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22 Wojciech Milkowski <wmilkowski at interia.pl> |
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23 Chad Netzer <chad.netzer at gmail.com> |
519 | 24 Bryan O'Sullivan <bos at serpentine.com> |
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25 Vicent SeguĂ Pascual <vseguip at gmail.com> |
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26 Sean Perry <shaleh at speakeasy.net> |
594 | 27 Nguyen Anh Quynh <aquynh at gmail.com> |
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28 Ollivier Robert <roberto at keltia.freenix.fr> |
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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> |
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32 Kevin Smith <yarcs at qualitycode.com> |
1231 | 33 TK Soh <teekaysoh at yahoo.com> |
519 | 34 Radoslaw Szkodzinski <astralstorm at gorzow.mm.pl> |
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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> | |
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40 Tristan Wibberley <tristan at wibberley.org> |
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41 Mark Williamson <mark.williamson at cl.cam.ac.uk> |