annotate tests/test-wireproto-command-branchmap.t @ 41247:a89b20a49c13

rust-cpython: using MissingAncestors from Python code

As precedently done with LazyAncestors on cpython.rs, we test for the
presence of the 'rustext' module.

incrementalmissingrevs() has two callers within the Mercurial core:
`setdiscovery.partialdiscovery` and the `only()` revset.

This move shows a significant discovery performance improvement
in cases where the baseline is slow: using perfdiscovery on the PyPy
repos, prepared with `contrib/discovery-helper <repo> 50 100`, we
get averaged medians of 403ms with the Rust version vs 742ms without
(about 45% better).

But there are still indications that performance can be worse in cases
the baseline is fast, possibly due to the conversion from Python to
Rust and back becoming the bottleneck. We could measure this on
mozilla-central in cases were the delta is just a few changesets.
This requires confirmation, but if that's the reason, then an
upcoming `partialdiscovery` fully in Rust should solve the problem.

Differential Revision: https://phab.mercurial-scm.org/D5551

  $ . $TESTDIR/wireprotohelpers.sh

  $ hg init server
  $ enablehttpv2 server
  $ cd server
  $ hg debugdrawdag << EOF
  > C D
  > |/
  > B
  > |
  > A
  > EOF

  $ hg up B
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch branch1
  marked working directory as branch branch1
  (branches are permanent and global, did you want a bookmark?)
  $ echo b1 > foo
  $ hg -q commit -A -m 'branch 1'
  $ hg up B
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg branch branch2
  marked working directory as branch branch2
  $ echo b2 > foo
  $ hg -q commit -A -m 'branch 2'

  $ hg log -T '{rev}:{node} {branch} {desc}\n'
  5:224161c7589aa48fa83a48feff5e95b56ae327fc branch2 branch 2
  4:b5faacdfd2633768cb3152336cc0953381266688 branch1 branch 1
  3:be0ef73c17ade3fc89dc41701eb9fc3a91b58282 default D
  2:26805aba1e600a82e93661149f2313866a221a7b default C
  1:112478962961147124edd43549aedd1a335e44bf default B
  0:426bada5c67598ca65036d57d9e4b64b0c1ce7a0 default A

  $ hg serve -p $HGPORT -d --pid-file hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

No arguments returns something reasonable

  $ sendhttpv2peer << EOF
  > command branchmap
  > EOF
  creating http peer for wire protocol version 2
  sending branchmap command
  response: {
    b'branch1': [
      b'\xb5\xfa\xac\xdf\xd2c7h\xcb1R3l\xc0\x953\x81&f\x88'
    ],
    b'branch2': [
      b'"Aa\xc7X\x9a\xa4\x8f\xa8:H\xfe\xff^\x95\xb5j\xe3\'\xfc'
    ],
    b'default': [
      b'&\x80Z\xba\x1e`\n\x82\xe96a\x14\x9f#\x13\x86j"\x1a{',
      b'\xbe\x0e\xf7<\x17\xad\xe3\xfc\x89\xdcAp\x1e\xb9\xfc:\x91\xb5\x82\x82'
    ]
  }

  $ cat error.log