Mercurial > hg
view tests/test-narrow-clone-nonlinear.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 | a2a6e724d61a |
children |
line wrap: on
line source
Testing narrow clones when changesets modifying a matching file exist on multiple branches $ . "$TESTDIR/narrow-library.sh" $ hg init master $ cd master $ cat >> .hg/hgrc <<EOF > [narrow] > serveellipses=True > EOF $ hg branch default marked working directory as branch default (branches are permanent and global, did you want a bookmark?) $ for x in `$TESTDIR/seq.py 10`; do > echo $x > "f$x" > hg add "f$x" > hg commit -m "Add $x" > done $ hg branch release-v1 marked working directory as branch release-v1 (branches are permanent and global, did you want a bookmark?) $ hg commit -m "Start release for v1" $ hg update default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ for x in `$TESTDIR/seq.py 10`; do > echo "$x v2" > "f$x" > hg commit -m "Update $x to v2" > done $ hg update release-v1 10 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch release-v1 marked working directory as branch release-v1 $ for x in `$TESTDIR/seq.py 1 5`; do > echo "$x v1 hotfix" > "f$x" > hg commit -m "Hotfix $x in v1" > done $ hg update default 10 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch release-v2 marked working directory as branch release-v2 $ hg commit -m "Start release for v2" $ hg update default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch default marked working directory as branch default $ for x in `$TESTDIR/seq.py 10`; do > echo "$x v3" > "f$x" > hg commit -m "Update $x to v3" > done $ hg update release-v2 10 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch release-v2 marked working directory as branch release-v2 $ for x in `$TESTDIR/seq.py 4 9`; do > echo "$x v2 hotfix" > "f$x" > hg commit -m "Hotfix $x in v2" > done $ hg heads -T '{rev} <- {p1rev} ({branch}): {desc}\n' 42 <- 41 (release-v2): Hotfix 9 in v2 36 <- 35 (default): Update 10 to v3 25 <- 24 (release-v1): Hotfix 5 in v1 $ cd .. We now have 3 branches: default, which has v3 of all files, release-v1 which has v1 of all files, and release-v2 with v2 of all files. Narrow clone which should get all branches $ hg clone --narrow ssh://user@dummy/master narrow --include "f5" requesting all changes adding changesets adding manifests adding file changes added 12 changesets with 5 changes to 1 files (+2 heads) new changesets *:* (glob) updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd narrow $ hg log -G -T "{if(ellipsis, '...')}{node|short} ({branch}): {desc}\n" o ...031f516143fe (release-v2): Hotfix 9 in v2 | o 9cd7f7bb9ca1 (release-v2): Hotfix 5 in v2 | o ...37bbc88f3ef0 (release-v2): Hotfix 4 in v2 | | @ ...dae2f368ca07 (default): Update 10 to v3 | | | o 9c224e89cb31 (default): Update 5 to v3 | | | o ...04fb59c7c9dc (default): Update 4 to v3 |/ | o b2253e82401f (release-v1): Hotfix 5 in v1 | | | o ...960ac37d74fd (release-v1): Hotfix 4 in v1 | | o | 986298e3f347 (default): Update 5 to v2 | | o | ...75d539c667ec (default): Update 4 to v2 |/ o 04c71bd5707f (default): Add 5 | o ...881b3891d041 (default): Add 4 Narrow clone the first file, hitting edge condition where unaligned changeset and manifest revnums cross branches. $ hg clone --narrow ssh://user@dummy/master narrow --include "f1" requesting all changes adding changesets adding manifests adding file changes added 10 changesets with 4 changes to 1 files (+2 heads) new changesets *:* (glob) updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd narrow $ hg log -G -T "{if(ellipsis, '...')}{node|short} ({branch}): {desc}\n" o ...031f516143fe (release-v2): Hotfix 9 in v2 | | @ ...dae2f368ca07 (default): Update 10 to v3 | | | o 1f5d184b8e96 (default): Update 1 to v3 |/ | o ...b2253e82401f (release-v1): Hotfix 5 in v1 | | | o 133502f6b7e5 (release-v1): Hotfix 1 in v1 | | o | ...79165c83d644 (default): Update 10 to v2 | | o | c7b7a5f2f088 (default): Update 1 to v2 | | | o ...f0531a3db7a9 (release-v1): Start release for v1 |/ o ...6a3f0f0abef3 (default): Add 10 | o e012ac15eaaa (default): Add 1