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view tests/test-clone-cgi.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 | 5abc47d4ca6b |
children | d5cd1fd690f3 |
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#require no-msys # MSYS will translate web paths as if they were file paths This is a test of the wire protocol over CGI-based hgweb. initialize repository $ hg init test $ cd test $ echo a > a $ hg ci -Ama adding a $ cd .. $ cat >hgweb.cgi <<HGWEB > # > # An example CGI script to use hgweb, edit as necessary > import cgitb > cgitb.enable() > from mercurial import demandimport; demandimport.enable() > from mercurial.hgweb import hgweb > from mercurial.hgweb import wsgicgi > application = hgweb(b"test", b"Empty test repository") > wsgicgi.launch(application) > HGWEB $ chmod 755 hgweb.cgi try hgweb request $ . "$TESTDIR/cgienv" $ QUERY_STRING="cmd=changegroup&roots=0000000000000000000000000000000000000000"; export QUERY_STRING $ "$PYTHON" hgweb.cgi >page1 2>&1 $ "$PYTHON" "$TESTDIR/md5sum.py" page1 1f424bb22ec05c3c6bc866b6e67efe43 page1 make sure headers are sent even when there is no body $ QUERY_STRING="cmd=listkeys&namespace=nosuchnamespace" "$PYTHON" hgweb.cgi Status: 200 Script output follows\r (esc) Content-Type: application/mercurial-0.1\r (esc) Content-Length: 0\r (esc) \r (esc)