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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> |
---|---|
date | Tue, 16 Apr 2019 01:16:39 +0200 |
parents | 2616325766e3 |
children |
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# # tcsh completion for Mercurial # # This file has been auto-generated by tcsh_completion_build.sh for # Mercurial Distributed SCM (version 1.7.5+157-8a220ae0b2ba) # # Copyright (C) 2005 TK Soh. # # This is free software; you can redistribute it and/or modify it under # the terms of the GNU General Public License as published by the Free # Software Foundation; either version 2 of the License, or (at your # option) any later version. # complete hg \ 'n/--cwd/d/' 'n/-R/d/' 'n/--repository/d/' \ 'C/-/( -R --repository \ --cwd \ -y --noninteractive \ -q --quiet \ -v --verbose \ --config \ --debug \ --debugger \ --encoding \ --encodingmode \ --traceback \ --time \ --profile \ --version \ -h --help)/' \ 'p/1/(add addremove annotate blame archive \ backout bisect bookmarks branch branches \ bundle cat clone commit ci \ copy cp debugancestor debugbuilddag debugcheckstate \ debugcommands debugcomplete debugdag debugdata debugdate \ debugfsinfo debugignore debugindex debugindexdot debuginstall \ debugpushkey debugrebuildstate debugrename debugrevspec debugsetparents \ debugstate debugsub debugwalk diff export \ forget grep heads help identify \ id import patch incoming in \ init locate log history manifest \ merge outgoing out parents paths \ pull push recover remove rm \ rename move mv resolve revert \ rollback root serve showconfig debugconfig \ status st summary sum tag \ tags tip unbundle update up \ checkout co verify version)/'