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view tests/test-bisect3.t @ 42743:8c9a6adec67a
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 | 7c324f65e4ef |
children | f51ff655d338 |
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# Here we create a simple DAG which has just enough of the required # topology to test all the bisection status labels: # # 13--14 # / # 0--1--2--3---------9--10--11--12 # \ / # 4--5--6--7--8 $ hg init $ echo '0' >a $ hg add a $ hg ci -u test -d '0 0' -m '0' $ echo '1' >a $ hg ci -u test -d '1 0' -m '1' branch 2-3 $ echo '2' >b $ hg add b $ hg ci -u test -d '2 0' -m '2' $ echo '3' >b $ hg ci -u test -d '3 0' -m '3' branch 4-8 $ hg up -r 1 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo '4' >c $ hg add c $ hg ci -u test -d '4 0' -m '4' created new head $ echo '5' >c $ hg ci -u test -d '5 0' -m '5' $ echo '6' >c $ hg ci -u test -d '6 0' -m '6' $ echo '7' >c $ hg ci -u test -d '7 0' -m '7' $ echo '8' >c $ hg ci -u test -d '8 0' -m '8' merge $ hg merge -r 3 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg ci -u test -d '9 0' -m '9=8+3' $ echo '10' >a $ hg ci -u test -d '10 0' -m '10' $ echo '11' >a $ hg ci -u test -d '11 0' -m '11' $ echo '12' >a $ hg ci -u test -d '12 0' -m '12' unrelated branch $ hg up -r 3 1 files updated, 0 files merged, 1 files removed, 0 files unresolved $ echo '13' >d $ hg add d $ hg ci -u test -d '13 0' -m '13' created new head $ echo '14' >d $ hg ci -u test -d '14 0' -m '14' mark changesets $ hg bisect --reset $ hg bisect --good 4 $ hg bisect --good 6 $ hg bisect --bad 12 Testing changeset 9:2197c557e14c (6 changesets remaining, ~2 tests) 1 files updated, 0 files merged, 1 files removed, 0 files unresolved $ hg bisect --bad 10 Testing changeset 8:e74a86251f58 (4 changesets remaining, ~2 tests) 0 files updated, 0 files merged, 1 files removed, 0 files unresolved $ hg bisect --skip 7 Testing changeset 8:e74a86251f58 (4 changesets remaining, ~2 tests) 0 files updated, 0 files merged, 0 files removed, 0 files unresolved test template $ hg log --template '{rev}:{node|short} {bisect}\n' 14:cbf2f3105bbf 13:e07efca37c43 12:98c6b56349c0 bad 11:03f491376e63 bad (implicit) 10:c012b15e2409 bad 9:2197c557e14c untested 8:e74a86251f58 untested 7:a5f87041c899 skipped 6:7d997bedcd8d good 5:2dd1875f1028 good (implicit) 4:2a1daef14cd4 good 3:8417d459b90c ignored 2:e1355ee1f23e ignored 1:ce7c85e06a9f good (implicit) 0:b4e73ffab476 good (implicit) $ hg log --template '{bisect|shortbisect} {rev}:{node|short}\n' 14:cbf2f3105bbf 13:e07efca37c43 B 12:98c6b56349c0 B 11:03f491376e63 B 10:c012b15e2409 U 9:2197c557e14c U 8:e74a86251f58 S 7:a5f87041c899 G 6:7d997bedcd8d G 5:2dd1875f1028 G 4:2a1daef14cd4 I 3:8417d459b90c I 2:e1355ee1f23e G 1:ce7c85e06a9f G 0:b4e73ffab476 test style $ hg log --style bisect changeset: 14:cbf2f3105bbf bisect: tag: tip user: test date: Thu Jan 01 00:00:14 1970 +0000 summary: 14 changeset: 13:e07efca37c43 bisect: parent: 3:8417d459b90c user: test date: Thu Jan 01 00:00:13 1970 +0000 summary: 13 changeset: 12:98c6b56349c0 bisect: bad user: test date: Thu Jan 01 00:00:12 1970 +0000 summary: 12 changeset: 11:03f491376e63 bisect: bad (implicit) user: test date: Thu Jan 01 00:00:11 1970 +0000 summary: 11 changeset: 10:c012b15e2409 bisect: bad user: test date: Thu Jan 01 00:00:10 1970 +0000 summary: 10 changeset: 9:2197c557e14c bisect: untested parent: 8:e74a86251f58 parent: 3:8417d459b90c user: test date: Thu Jan 01 00:00:09 1970 +0000 summary: 9=8+3 changeset: 8:e74a86251f58 bisect: untested user: test date: Thu Jan 01 00:00:08 1970 +0000 summary: 8 changeset: 7:a5f87041c899 bisect: skipped user: test date: Thu Jan 01 00:00:07 1970 +0000 summary: 7 changeset: 6:7d997bedcd8d bisect: good user: test date: Thu Jan 01 00:00:06 1970 +0000 summary: 6 changeset: 5:2dd1875f1028 bisect: good (implicit) user: test date: Thu Jan 01 00:00:05 1970 +0000 summary: 5 changeset: 4:2a1daef14cd4 bisect: good parent: 1:ce7c85e06a9f user: test date: Thu Jan 01 00:00:04 1970 +0000 summary: 4 changeset: 3:8417d459b90c bisect: ignored user: test date: Thu Jan 01 00:00:03 1970 +0000 summary: 3 changeset: 2:e1355ee1f23e bisect: ignored user: test date: Thu Jan 01 00:00:02 1970 +0000 summary: 2 changeset: 1:ce7c85e06a9f bisect: good (implicit) user: test date: Thu Jan 01 00:00:01 1970 +0000 summary: 1 changeset: 0:b4e73ffab476 bisect: good (implicit) user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: 0 $ hg log --quiet --style bisect 14:cbf2f3105bbf 13:e07efca37c43 B 12:98c6b56349c0 B 11:03f491376e63 B 10:c012b15e2409 U 9:2197c557e14c U 8:e74a86251f58 S 7:a5f87041c899 G 6:7d997bedcd8d G 5:2dd1875f1028 G 4:2a1daef14cd4 I 3:8417d459b90c I 2:e1355ee1f23e G 1:ce7c85e06a9f G 0:b4e73ffab476 $ hg --config extensions.color= --color=debug log --quiet --style bisect [log.bisect| ] 14:cbf2f3105bbf [log.bisect| ] 13:e07efca37c43 [log.bisect bisect.bad|B] 12:98c6b56349c0 [log.bisect bisect.bad|B] 11:03f491376e63 [log.bisect bisect.bad|B] 10:c012b15e2409 [log.bisect bisect.untested|U] 9:2197c557e14c [log.bisect bisect.untested|U] 8:e74a86251f58 [log.bisect bisect.skipped|S] 7:a5f87041c899 [log.bisect bisect.good|G] 6:7d997bedcd8d [log.bisect bisect.good|G] 5:2dd1875f1028 [log.bisect bisect.good|G] 4:2a1daef14cd4 [log.bisect bisect.ignored|I] 3:8417d459b90c [log.bisect bisect.ignored|I] 2:e1355ee1f23e [log.bisect bisect.good|G] 1:ce7c85e06a9f [log.bisect bisect.good|G] 0:b4e73ffab476