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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 | 73ccba60aaa1 |
children | dbaf9aabfb69 |
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# same user, same group trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # same user, different group trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # different user, same group not trusting file .hg/hgrc from untrusted user abc, group bar trusted global = /some/path untrusted . . global = /some/path . . local = /another/path # different user, same group, but we trust the group trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # different user, different group not trusting file .hg/hgrc from untrusted user abc, group def trusted global = /some/path untrusted . . global = /some/path . . local = /another/path # different user, different group, but we trust the user trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # different user, different group, but we trust the group trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # different user, different group, but we trust the user and the group trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # we trust all users # different user, different group trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # we trust all groups # different user, different group trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # we trust all users and groups # different user, different group trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # we don't get confused by users and groups with the same name # different user, different group not trusting file .hg/hgrc from untrusted user abc, group def trusted global = /some/path untrusted . . global = /some/path . . local = /another/path # list of user names # different user, different group, but we trust the user trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # list of group names # different user, different group, but we trust the group trusted global = /some/path local = /another/path untrusted . . global = /some/path . . local = /another/path # Can't figure out the name of the user running this process # different user, different group not trusting file .hg/hgrc from untrusted user abc, group def trusted global = /some/path untrusted . . global = /some/path . . local = /another/path # prints debug warnings # different user, different group not trusting file .hg/hgrc from untrusted user abc, group def trusted ignoring untrusted configuration option paths.local = /another/path global = /some/path untrusted . . global = /some/path . ignoring untrusted configuration option paths.local = /another/path . local = /another/path # report_untrusted enabled without debug hides warnings # different user, different group trusted global = /some/path untrusted . . global = /some/path . . local = /another/path # report_untrusted enabled with debug shows warnings # different user, different group not trusting file .hg/hgrc from untrusted user abc, group def trusted ignoring untrusted configuration option paths.local = /another/path global = /some/path untrusted . . global = /some/path . ignoring untrusted configuration option paths.local = /another/path . local = /another/path # ui.readconfig sections quux # read trusted, untrusted, new ui, trusted not trusting file foobar from untrusted user abc, group def trusted: ignoring untrusted configuration option foobar.baz = quux None untrusted: quux # error handling # file doesn't exist # same user, same group # different user, different group # parse error # different user, different group not trusting file .hg/hgrc from untrusted user abc, group def ParseError('foo', '.hg/hgrc:1') # same user, same group ParseError('foo', '.hg/hgrc:1') # access typed information # different user, different group not trusting file .hg/hgrc from untrusted user abc, group def # suboptions, trusted and untrusted (None, []) ('main', [('one', 'one'), ('two', 'two')]) # path, trusted and untrusted None .hg/monty/python # bool, trusted and untrusted False True # int, trusted and untrusted 0 42 # bytes, trusted and untrusted 0 84934656 # list, trusted and untrusted [] ['spam', 'ham', 'eggs']