update: add a Rust fast-path when updating from null (and clean)
This case is easy to detect and we have all we need to generate a valid
working copy and dirstate entirely in Rust, which speeds things up
considerably:
On my machine updating a repo of ~300k files goes from 10.00s down to 4.2s,
all while consuming 50% less system time, with all caches hot.
Something to note is that further improvements will probably happen
with the upcoming `InnerRevlog` series that does smarter
mmap hanlding, especially for filelogs.
Here are benchmark numbers on a machine with only 4 cores (and no SMT enabled)
```
### data-env-vars.name = heptapod-public-2024-03-25-ds2-pnm
# benchmark.name = hg.command.update
# bin-env-vars.hg.py-re2-module = default
# bin-env-vars.hg.changeset.node = <this change>
# benchmark.variants.atomic-update = no
# benchmark.variants.scenario = null-to-tip
# benchmark.variants.worker = default
default: 5.328762 ~~~~~
rust: 1.308654 (-75.44%, -4.02)
### data-env-vars.name = mercurial-devel-2024-03-22-ds2-pnm
# benchmark.name = hg.command.update
# bin-env-vars.hg.py-re2-module = default
# bin-env-vars.hg.changeset.node = <this change>
# benchmark.variants.atomic-update = no
# benchmark.variants.scenario = null-to-tip
# benchmark.variants.worker = default
default: 1.693271 ~~~~~
rust: 1.151053 (-32.02%, -0.54)
### data-env-vars.name = mozilla-unified-2024-03-22-ds2-pnm
# benchmark.name = hg.command.update
# bin-env-vars.hg.py-re2-module = default
# bin-env-vars.hg.changeset.node = <this change>
# benchmark.variants.atomic-update = no
# benchmark.variants.scenario = null-to-tip
# benchmark.variants.worker = default
default: 38.901613 ~~~~~
rust: 11.637880 (-70.08%, -27.26)
### data-env-vars.name = netbsd-xsrc-public-2024-09-19-ds2-pnm
# benchmark.name = hg.command.update
# bin-env-vars.hg.py-re2-module = default
# bin-env-vars.hg.changeset.node = <this change>
# benchmark.variants.atomic-update = no
# benchmark.variants.scenario = null-to-tip
# benchmark.variants.worker = default
default: 4.793727 ~~~~~
rust: 1.505905 (-68.59%, -3.29)
```
============================================
Testing obsolescence markers push: Cases D.3
============================================
Mercurial pushes obsolescences markers relevant to the "pushed-set", the set of
all changesets that requested to be "in sync" after the push (even if they are
already on both side).
This test belongs to a series of tests checking such set is properly computed
and applied. This does not tests "obsmarkers" discovery capabilities.
Category D: Partial Information Case
TestCase 3: missing prune target (prune not in "pushed set")
D.3 missing prune target (prune not in "pushed set")
====================================================
.. {{{
.. A ø⇠✕ A'
.. | |
.. | ○ B
.. |/
.. ● O
.. }}}
..
.. Marker exist from:
..
.. * `A ø⇠o A'`
.. * A' (prune)
..
.. Command runs:
..
.. * hg push
..
.. Expected exclude:
..
.. * `A ø⇠o A'`
.. * A' (prune)
Setup
-----
$ . $TESTDIR/testlib/exchange-obsmarker-util.sh
initial
$ setuprepos D.3
creating test repo for test case D.3
- pulldest
- main
- pushdest
cd into `main` and proceed with env setup
$ cd main
$ mkcommit A0
$ hg up -q 0
$ mkcommit B
created new head
$ mkcommit A1
$ hg debugobsolete `getid 'desc(A0)'` `getid 'desc(A1)'`
1 new obsolescence markers
obsoleted 1 changesets
$ hg prune -d '0 0' .
1 new obsolescence markers
obsoleted 1 changesets
$ hg strip --hidden -q 'desc(A1)'
$ hg log -G --hidden
@ 35b183996678 (draft): B
|
| x 28b51eb45704 (draft): A0
|/
o a9bdc8b26820 (public): O
$ inspect_obsmarkers
obsstore content
================
28b51eb45704506b5c603decd6bf7ac5e0f6a52f 6aa67a7b4baa6fb41b06aed38d5b1201436546e2 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
6aa67a7b4baa6fb41b06aed38d5b1201436546e2 0 {35b1839966785d5703a01607229eea932db42f87} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
$ cd ..
$ cd ..
Actual Test
-----------
$ dotest D.3 O
## Running testcase D.3
# testing echange of "O" (a9bdc8b26820)
## initial state
# obstore: main
28b51eb45704506b5c603decd6bf7ac5e0f6a52f 6aa67a7b4baa6fb41b06aed38d5b1201436546e2 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
6aa67a7b4baa6fb41b06aed38d5b1201436546e2 0 {35b1839966785d5703a01607229eea932db42f87} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
# obstore: pushdest
# obstore: pulldest
## pushing "O" from main to pushdest
pushing to pushdest
searching for changes
no changes found
## post push state
# obstore: main
28b51eb45704506b5c603decd6bf7ac5e0f6a52f 6aa67a7b4baa6fb41b06aed38d5b1201436546e2 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
6aa67a7b4baa6fb41b06aed38d5b1201436546e2 0 {35b1839966785d5703a01607229eea932db42f87} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
# obstore: pushdest
# obstore: pulldest
## pulling "a9bdc8b26820" from main into pulldest
pulling from main
no changes found
## post pull state
# obstore: main
28b51eb45704506b5c603decd6bf7ac5e0f6a52f 6aa67a7b4baa6fb41b06aed38d5b1201436546e2 0 (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
6aa67a7b4baa6fb41b06aed38d5b1201436546e2 0 {35b1839966785d5703a01607229eea932db42f87} (Thu Jan 01 00:00:00 1970 +0000) {'user': 'test'}
# obstore: pushdest
# obstore: pulldest