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view tests/test-extdata.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 | ea6558db1011 |
children | ebee234d952a |
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$ hg init repo $ cd repo $ for n in 0 1 2 3 4 5 6 7 8 9 10 11; do > echo $n > $n > hg ci -qAm $n > done test revset support $ cat <<'EOF' >> .hg/hgrc > [extdata] > filedata = file:extdata.txt > notes = notes.txt > shelldata = shell:cat extdata.txt | grep 2 > emptygrep = shell:cat extdata.txt | grep empty > badparse = shell:cat badparse.txt > EOF $ cat <<'EOF' > extdata.txt > 2 another comment on 2 > 3 > EOF $ cat <<'EOF' > notes.txt > f6ed this change is great! > e834 this is buggy :( > 0625 first post > bogusnode gives no error > a ambiguous node gives no error > EOF $ hg log -qr "extdata(filedata)" 2:f6ed99a58333 3:9de260b1e88e $ hg log -qr "extdata(shelldata)" 2:f6ed99a58333 test weight of extdata() revset $ hg debugrevspec -p optimized "extdata(filedata) & 3" * optimized: (andsmally (func (symbol 'extdata') (symbol 'filedata')) (symbol '3')) 3 test non-zero exit of shell command $ hg log -qr "extdata(emptygrep)" abort: extdata command 'cat extdata.txt | grep empty' failed: exited with status 1 [255] test bad extdata() revset source $ hg log -qr "extdata()" hg: parse error: extdata takes at least 1 string argument [255] $ hg log -qr "extdata(unknown)" abort: unknown extdata source 'unknown' [255] test a zero-exiting source that emits garbage to confuse the revset parser $ cat > badparse.txt <<'EOF' > +---------------------------------------+ > 9de260b1e88e > EOF It might be nice if this error message mentioned where the bad string came from (eg line X of extdata source S), but the important thing is that we don't crash before we can print the parse error. $ hg log -qr "extdata(badparse)" hg: parse error at 0: not a prefix: + (+---------------------------------------+ ^ here) [255] test template support: $ hg log -r:3 -T "{node|short}{if(extdata('notes'), ' # {extdata('notes')}')}\n" 06254b906311 # first post e8342c9a2ed1 # this is buggy :( f6ed99a58333 # this change is great! 9de260b1e88e test template cache: $ hg log -r:3 -T '{rev} "{extdata("notes")}" "{extdata("shelldata")}"\n' 0 "first post" "" 1 "this is buggy :(" "" 2 "this change is great!" "another comment on 2" 3 "" "" test bad extdata() template source $ hg log -T "{extdata()}\n" hg: parse error: extdata expects one argument [255] $ hg log -T "{extdata('unknown')}\n" abort: unknown extdata source 'unknown' [255] $ hg log -T "{extdata(unknown)}\n" hg: parse error: empty data source specified (did you mean extdata('unknown')?) [255] $ hg log -T "{extdata('{unknown}')}\n" hg: parse error: empty data source specified [255] we don't fix up relative file URLs, but we do run shell commands in repo root $ mkdir sub $ cd sub $ hg log -qr "extdata(filedata)" abort: error: $ENOENT$ [255] $ hg log -qr "extdata(shelldata)" 2:f6ed99a58333 $ cd ..