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view tests/test-stack.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 | 68fcc5503ec5 |
children |
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This test test the low-level definition of stack, agnostic from all formatting Initial setup $ cat << EOF >> $HGRCPATH > [ui] > logtemplate = {rev} {branch} {phase} {desc|firstline}\n > [extensions] > rebase= > [experimental] > evolution=createmarkers,exchange,allowunstable > EOF $ hg init main $ cd main $ hg branch other marked working directory as branch other (branches are permanent and global, did you want a bookmark?) $ echo aaa > aaa $ hg add aaa $ hg commit -m c_a $ echo aaa > bbb $ hg add bbb $ hg commit -m c_b $ hg branch foo marked working directory as branch foo $ echo aaa > ccc $ hg add ccc $ hg commit -m c_c $ echo aaa > ddd $ hg add ddd $ hg commit -m c_d $ echo aaa > eee $ hg add eee $ hg commit -m c_e $ echo aaa > fff $ hg add fff $ hg commit -m c_f $ hg log -G @ 5 foo draft c_f | o 4 foo draft c_e | o 3 foo draft c_d | o 2 foo draft c_c | o 1 other draft c_b | o 0 other draft c_a Check that stack doesn't include public changesets -------------------------------------------------- $ hg up other 0 files updated, 0 files merged, 4 files removed, 0 files unresolved $ hg log -G -r "stack()" @ 1 other draft c_b | o 0 other draft c_a $ hg phase --public 'branch("other")' $ hg log -G -r "stack()" $ hg up foo 4 files updated, 0 files merged, 0 files removed, 0 files unresolved Simple test ----------- 'stack()' list all changeset in the branch $ hg branch foo $ hg log -G -r "stack()" @ 5 foo draft c_f | o 4 foo draft c_e | o 3 foo draft c_d | o 2 foo draft c_c | ~ Case with some of the branch unstable ------------------------------------ $ hg up 3 0 files updated, 0 files merged, 2 files removed, 0 files unresolved $ echo bbb > ddd $ hg commit --amend 2 new orphan changesets $ hg log -G @ 6 foo draft c_d | | * 5 foo draft c_f | | | * 4 foo draft c_e | | | x 3 foo draft c_d |/ o 2 foo draft c_c | o 1 other public c_b | o 0 other public c_a $ hg log -G -r "stack()" @ 6 foo draft c_d | ~ $ hg up -r "desc(c_e)" 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg log -G -r "stack()" @ 4 foo draft c_e | x 3 foo draft c_d | ~ $ hg up -r "desc(c_d)" 1 files updated, 0 files merged, 1 files removed, 0 files unresolved $ hg log -G -r "stack()" @ 6 foo draft c_d | ~ Case with multiple topological heads ------------------------------------ Make things linear again $ hg rebase -s 'desc(c_e)' -d 'desc(c_d) - obsolete()' rebasing 4:4f2a69f6d380 "c_e" rebasing 5:913c298d8b0a "c_f" $ hg log -G o 8 foo draft c_f | o 7 foo draft c_e | @ 6 foo draft c_d | o 2 foo draft c_c | o 1 other public c_b | o 0 other public c_a Create the second branch $ hg up 'desc(c_d)' 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo aaa > ggg $ hg add ggg $ hg commit -m c_g created new head $ echo aaa > hhh $ hg add hhh $ hg commit -m c_h $ hg log -G @ 10 foo draft c_h | o 9 foo draft c_g | | o 8 foo draft c_f | | | o 7 foo draft c_e |/ o 6 foo draft c_d | o 2 foo draft c_c | o 1 other public c_b | o 0 other public c_a Test output $ hg log -G -r "stack(10)" @ 10 foo draft c_h | o 9 foo draft c_g | ~ $ hg log -G -r "stack(8)" o 8 foo draft c_f | o 7 foo draft c_e | ~ $ hg log -G -r "stack(head())" @ 10 foo draft c_h | o 9 foo draft c_g | ~ o 8 foo draft c_f | o 7 foo draft c_e | ~ Check the stack order $ hg log -r "first(stack())" 9 foo draft c_g $ hg log -r "first(stack(10))" 9 foo draft c_g $ hg log -r "first(stack(8))" 7 foo draft c_e $ hg log -r "first(stack(head()))" 7 foo draft c_e Case with multiple heads with unstability involved -------------------------------------------------- We amend the message to make sure the display base pick the right changeset $ hg up 'desc(c_d)' 0 files updated, 0 files merged, 2 files removed, 0 files unresolved $ echo ccc > ddd $ hg commit --amend -m 'c_D' 4 new orphan changesets $ hg rebase -d . -s 'desc(c_g)' rebasing 9:2ebb6e48ab8a "c_g" rebasing 10:634f38e27a1d "c_h" $ hg log -G o 13 foo draft c_h | o 12 foo draft c_g | @ 11 foo draft c_D | | * 8 foo draft c_f | | | * 7 foo draft c_e | | | x 6 foo draft c_d |/ o 2 foo draft c_c | o 1 other public c_b | o 0 other public c_a We should improve stack definition to also show 12 and 13 here $ hg log -G -r "stack()" @ 11 foo draft c_D | ~