view tests/test-push-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

#require no-msys # MSYS will translate web paths as if they were file paths

This is a test of the push wire protocol over CGI-based hgweb.

initialize repository

  $ hg init r
  $ cd r
  $ echo a > a
  $ hg ci -A -m "0"
  adding a
  $ echo '[web]' > .hg/hgrc
  $ echo 'allow_push = *' >> .hg/hgrc
  $ echo 'push_ssl = false' >> .hg/hgrc

create hgweb invocation script

  $ cat >hgweb.cgi <<HGWEB
  > import cgitb
  > cgitb.enable()
  > from mercurial import demandimport; demandimport.enable()
  > from mercurial.hgweb import hgweb
  > from mercurial.hgweb import wsgicgi
  > application = hgweb(b'.', b'test repository')
  > wsgicgi.launch(application)
  > HGWEB
  $ chmod 755 hgweb.cgi

test preparation

  $ . "$TESTDIR/cgienv"
  $ REQUEST_METHOD="POST"; export REQUEST_METHOD
  $ CONTENT_TYPE="application/octet-stream"; export CONTENT_TYPE
  $ hg bundle --type v1 --all bundle.hg
  1 changesets found
  $ CONTENT_LENGTH=279; export CONTENT_LENGTH;

expect failure because heads doesn't match (formerly known as 'unsynced changes')

  $ QUERY_STRING="cmd=unbundle&heads=0000000000000000000000000000000000000000"; export QUERY_STRING
  $ "$PYTHON" hgweb.cgi <bundle.hg >page1 2>&1
  $ cat page1
  Status: 200 Script output follows\r (esc)
  Content-Type: application/mercurial-0.1\r (esc)
  Content-Length: 64\r (esc)
  \r (esc)
  0
  repository changed while preparing changes - please try again

successful force push

  $ QUERY_STRING="cmd=unbundle&heads=666f726365"; export QUERY_STRING
  $ "$PYTHON" hgweb.cgi <bundle.hg >page2 2>&1
  $ cat page2
  Status: 200 Script output follows\r (esc)
  Content-Type: application/mercurial-0.1\r (esc)
  Content-Length: 102\r (esc)
  \r (esc)
  1
  adding changesets
  adding manifests
  adding file changes
  added 0 changesets with 0 changes to 1 files

successful push, list of heads

  $ QUERY_STRING="cmd=unbundle&heads=f7b1eb17ad24730a1651fccd46c43826d1bbc2ac"; export QUERY_STRING
  $ "$PYTHON" hgweb.cgi <bundle.hg >page3 2>&1
  $ cat page3
  Status: 200 Script output follows\r (esc)
  Content-Type: application/mercurial-0.1\r (esc)
  Content-Length: 102\r (esc)
  \r (esc)
  1
  adding changesets
  adding manifests
  adding file changes
  added 0 changesets with 0 changes to 1 files

successful push, SHA1 hash of heads (unbundlehash capability)

  $ QUERY_STRING="cmd=unbundle&heads=686173686564 5a785a5f9e0d433b88ed862b206b011b0c3a9d13"; export QUERY_STRING
  $ "$PYTHON" hgweb.cgi <bundle.hg >page4 2>&1
  $ cat page4
  Status: 200 Script output follows\r (esc)
  Content-Type: application/mercurial-0.1\r (esc)
  Content-Length: 102\r (esc)
  \r (esc)
  1
  adding changesets
  adding manifests
  adding file changes
  added 0 changesets with 0 changes to 1 files

  $ cd ..