view tests/test-hg-parseurl.py @ 47120:7109a38830c9

dirstate-tree: Fold "tracked descendants" counter update in main walk

For the purpose of implementing `has_tracked_dir` (which means "has tracked
descendants) without an expensive sub-tree traversal, we maintaing a counter
of tracked descendants on each "directory" node of the tree-shaped dirstate.

Before this changeset, mutating or inserting a node at a given path would
involve:

* Walking the tree from root through ancestors to find the node or the spot
  where to insert it
* Looking at the previous node if any to decide what counter update is needed
* Performing any node mutation
* Walking the tree *again* to update counters in ancestor nodes

When profiling `hg status` on a large repo, this second walk takes times
while loading a the dirstate from disk.

It turns out we have enough information to decide before he first tree walk
what counter update is needed. This changeset merges the two walks, gaining
~10% of the total time for `hg update` (in the same hyperfine benchmark as
the previous changeset).

---

Profiling was done by compiling with this `.cargo/config`:

    [profile.release]
    debug = true

then running with:

    py-spy record -r 500 -n -o /tmp/hg.json --format speedscope -- \
    ./hg status -R $REPO --config experimental.dirstate-tree.in-memory=1

then visualizing the recorded JSON file in https://www.speedscope.app/

Differential Revision: https://phab.mercurial-scm.org/D10554

from __future__ import absolute_import, print_function

import unittest

from mercurial.utils import urlutil


class ParseRequestTests(unittest.TestCase):
    def testparse(self):

        self.assertEqual(
            urlutil.parseurl(b'http://example.com/no/anchor'),
            (b'http://example.com/no/anchor', (None, [])),
        )
        self.assertEqual(
            urlutil.parseurl(b'http://example.com/an/anchor#foo'),
            (b'http://example.com/an/anchor', (b'foo', [])),
        )
        self.assertEqual(
            urlutil.parseurl(
                b'http://example.com/no/anchor/branches', [b'foo']
            ),
            (b'http://example.com/no/anchor/branches', (None, [b'foo'])),
        )
        self.assertEqual(
            urlutil.parseurl(
                b'http://example.com/an/anchor/branches#bar', [b'foo']
            ),
            (b'http://example.com/an/anchor/branches', (b'bar', [b'foo'])),
        )
        self.assertEqual(
            urlutil.parseurl(
                b'http://example.com/an/anchor/branches-None#foo', None
            ),
            (b'http://example.com/an/anchor/branches-None', (b'foo', [])),
        )
        self.assertEqual(
            urlutil.parseurl(b'http://example.com/'),
            (b'http://example.com/', (None, [])),
        )
        self.assertEqual(
            urlutil.parseurl(b'http://example.com'),
            (b'http://example.com/', (None, [])),
        )
        self.assertEqual(
            urlutil.parseurl(b'http://example.com#foo'),
            (b'http://example.com/', (b'foo', [])),
        )


if __name__ == '__main__':
    import silenttestrunner

    silenttestrunner.main(__name__)