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view tests/test-show.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 | e6b5e7329ff2 |
children |
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$ cat >> $HGRCPATH << EOF > [extensions] > show = > EOF No arguments shows available views $ hg init empty $ cd empty $ hg show available views: bookmarks -- bookmarks and their associated changeset stack -- current line of work work -- changesets that aren't finished abort: no view requested (use "hg show VIEW" to choose a view) [255] `hg help show` prints available views $ hg help show hg show VIEW show various repository information A requested view of repository data is displayed. If no view is requested, the list of available views is shown and the command aborts. Note: There are no backwards compatibility guarantees for the output of this command. Output may change in any future Mercurial release. Consumers wanting stable command output should specify a template via "-T/--template". List of available views: bookmarks bookmarks and their associated changeset stack current line of work work changesets that aren't finished (use 'hg help -e show' to show help for the show extension) options: -T --template TEMPLATE display with template (some details hidden, use --verbose to show complete help) Unknown view prints error $ hg show badview abort: unknown view: badview (run "hg show" to see available views) [255] HGPLAIN results in abort $ HGPLAIN=1 hg show bookmarks abort: must specify a template in plain mode (invoke with -T/--template to control output format) [255] But not if a template is specified $ HGPLAIN=1 hg show bookmarks -T '{bookmark}\n' (no bookmarks set) $ cd .. bookmarks view with no bookmarks prints empty message $ hg init books $ cd books $ touch f0 $ hg -q commit -A -m initial $ hg show bookmarks (no bookmarks set) bookmarks view shows bookmarks in an aligned table $ echo book1 > f0 $ hg commit -m 'commit for book1' $ echo book2 > f0 $ hg commit -m 'commit for book2' $ hg bookmark -r 1 book1 $ hg bookmark a-longer-bookmark $ hg show bookmarks * a-longer-bookmark 7b57 book1 b757 A custom bookmarks template works $ hg show bookmarks -T '{node} {bookmark} {active}\n' 7b5709ab64cbc34da9b4367b64afff47f2c4ee83 a-longer-bookmark True b757f780b8ffd71267c6ccb32e0882d9d32a8cc0 book1 False bookmarks JSON works $ hg show bookmarks -T json [ { "active": true, "bookmark": "a-longer-bookmark", "longestbookmarklen": 17, "node": "7b5709ab64cbc34da9b4367b64afff47f2c4ee83", "nodelen": 4 }, { "active": false, "bookmark": "book1", "longestbookmarklen": 17, "node": "b757f780b8ffd71267c6ccb32e0882d9d32a8cc0", "nodelen": 4 } ] JSON works with no bookmarks $ hg book -d a-longer-bookmark $ hg book -d book1 $ hg show bookmarks -T json [ ] commands.show.aliasprefix aliases values to `show <view>` $ hg --config commands.show.aliasprefix=s sbookmarks (no bookmarks set) $ hg --config commands.show.aliasprefix=sh shwork @ 7b57 commit for book2 o b757 commit for book1 o ba59 initial $ hg --config commands.show.aliasprefix='s sh' swork @ 7b57 commit for book2 o b757 commit for book1 o ba59 initial $ hg --config commands.show.aliasprefix='s sh' shwork @ 7b57 commit for book2 o b757 commit for book1 o ba59 initial The aliases don't appear in `hg config` $ hg --config commands.show.aliasprefix=s config alias [1] Doesn't overwrite existing alias $ hg --config alias.swork='log -r .' --config commands.show.aliasprefix=s swork changeset: 2:7b5709ab64cb tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: commit for book2 $ hg --config alias.swork='log -r .' --config commands.show.aliasprefix=s config alias alias.swork=log -r . $ cd ..