Mercurial > hg
view tests/test-convert-hg-source.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 | fcd7a91dec23 |
children | 1b8fd4af3318 |
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$ cat >> $HGRCPATH <<EOF > [extensions] > convert= > [convert] > hg.saverev=False > EOF $ hg init orig $ cd orig $ echo foo > foo $ echo bar > bar $ hg ci -qAm 'add foo bar' -d '0 0' $ echo >> foo $ hg ci -m 'change foo' -d '1 0' $ hg up -qC 0 $ hg copy --after --force foo bar $ hg copy foo baz $ hg ci -m 'make bar and baz copies of foo' -d '2 0' created new head Test that template can print all file copies (issue4362) $ hg log -r . --template "{file_copies % ' File: {file_copy}\n'}" File: bar (foo) File: baz (foo) $ hg bookmark premerge1 $ hg merge -r 1 merging baz and foo to baz 1 files updated, 1 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg ci -m 'merge local copy' -d '3 0' $ hg up -C 1 1 files updated, 0 files merged, 1 files removed, 0 files unresolved (leaving bookmark premerge1) $ hg bookmark premerge2 $ hg merge 2 merging foo and baz to baz 1 files updated, 1 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg ci -m 'merge remote copy' -d '4 0' created new head Make and delete some tags $ hg tag that $ hg tag --remove that $ hg tag this #if execbit $ chmod +x baz #else $ echo some other change to make sure we get a rev 5 > baz #endif $ hg ci -m 'mark baz executable' -d '5 0' $ cd .. $ hg convert --datesort orig new 2>&1 | grep -v 'subversion python bindings could not be loaded' initializing destination new repository scanning source... sorting... converting... 8 add foo bar 7 change foo 6 make bar and baz copies of foo 5 merge local copy 4 merge remote copy 3 Added tag that for changeset 88586c4e9f02 2 Removed tag that 1 Added tag this for changeset c56a7f387039 0 mark baz executable updating bookmarks $ cd new $ hg out ../orig comparing with ../orig searching for changes no changes found [1] #if execbit $ hg bookmarks premerge1 3:973ef48a98a4 premerge2 8:91d107c423ba #else Different hash because no x bit $ hg bookmarks premerge1 3:973ef48a98a4 premerge2 8:3537b15eaaca #endif Test that redoing a convert results in an identical graph $ cd ../ $ rm new/.hg/shamap $ hg convert --datesort orig new 2>&1 | grep -v 'subversion python bindings could not be loaded' scanning source... sorting... converting... 8 add foo bar 7 change foo 6 make bar and baz copies of foo 5 merge local copy 4 merge remote copy 3 Added tag that for changeset 88586c4e9f02 2 Removed tag that 1 Added tag this for changeset c56a7f387039 0 mark baz executable updating bookmarks $ hg -R new log -G -T '{rev} {desc}' o 8 mark baz executable | o 7 Added tag this for changeset c56a7f387039 | o 6 Removed tag that | o 5 Added tag that for changeset 88586c4e9f02 | o 4 merge remote copy |\ +---o 3 merge local copy | |/ | o 2 make bar and baz copies of foo | | o | 1 change foo |/ o 0 add foo bar check shamap LF and CRLF handling $ cat > rewrite.py <<EOF > import sys > # Interlace LF and CRLF > lines = [(l.rstrip() + ((i % 2) and b'\n' or b'\r\n')) > for i, l in enumerate(open(sys.argv[1], 'rb'))] > open(sys.argv[1], 'wb').write(b''.join(lines)) > EOF $ "$PYTHON" rewrite.py new/.hg/shamap $ cd orig $ hg up -qC 1 $ echo foo >> foo $ hg ci -qm 'change foo again' $ hg up -qC 2 $ echo foo >> foo $ hg ci -qm 'change foo again again' $ cd .. $ hg convert --datesort orig new 2>&1 | grep -v 'subversion python bindings could not be loaded' scanning source... sorting... converting... 1 change foo again again 0 change foo again updating bookmarks init broken repository $ hg init broken $ cd broken $ echo a >> a $ echo b >> b $ hg ci -qAm init $ echo a >> a $ echo b >> b $ hg copy b c $ hg ci -qAm changeall $ hg up -qC 0 $ echo bc >> b $ hg ci -m changebagain created new head $ HGMERGE=internal:local hg -q merge $ hg ci -m merge $ hg mv b d $ hg ci -m moveb break it #if reporevlogstore $ rm .hg/store/data/b.* #endif #if reposimplestore $ rm .hg/store/data/b/* #endif $ cd .. $ hg --config convert.hg.ignoreerrors=True convert broken fixed initializing destination fixed repository scanning source... sorting... converting... 4 init ignoring: data/b.i@1e88685f5dde: no match found (reporevlogstore !) ignoring: data/b/index@1e88685f5dde: no node (reposimplestore !) 3 changeall 2 changebagain 1 merge 0 moveb $ hg -R fixed verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 5 changesets with 5 changes to 3 files manifest -r 0 $ hg -R fixed manifest -r 0 a manifest -r tip $ hg -R fixed manifest -r tip a c d $ cd .. $ hg init commit-references $ cd commit-references $ echo a > a $ hg ci -Aqm initial $ echo b > b $ hg ci -Aqm 'the previous commit was 1451231c8757' $ echo c > c $ hg ci -Aqm 'the working copy is called ffffffffffff' $ cd .. $ hg convert commit-references new-commit-references -q \ > --config convert.hg.sourcename=yes $ cd new-commit-references $ hg log -T '{node|short} {desc}\n' fe295c9e6bc6 the working copy is called ffffffffffff 642508659503 the previous commit was c2491f685436 c2491f685436 initial