view tests/test-issue1175.t @ 18275:9818f22785b7

performance: speedup computation of unstable revisions

In their current state, revset calls can be very costly, as we test
predicates on the entire repository.

This change drops revset call in favor of direct testing of the
phase of changesets.

Performance test on my Mercurial checkout
- 19857 total changesets,
- 1584 obsolete changesets,
- 13310 obsolescence markers.

Before:
  ! unstable
  ! wall 0.017366

After this changes:
  ! unstable
  ! wall 0.008093

Performance test on a Mozilla central checkout:
- 117293 total changesets,
- 1 obsolete changeset,
- 1 obsolescence marker.

Before:
  ! unstable
  ! wall 0.045190

After:
  ! unstable
  ! wall 0.000032

http://mercurial.selenic.com/bts/issue1175

  $ hg init
  $ touch a
  $ hg ci -Am0
  adding a

  $ hg mv a a1
  $ hg ci -m1

  $ hg co 0
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ hg mv a a2
  $ hg up
  note: possible conflict - a was renamed multiple times to:
   a2
   a1
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg ci -m2

  $ touch a
  $ hg ci -Am3
  adding a

  $ hg mv a b
  $ hg ci -Am4 a

  $ hg ci --debug --traceback -Am5 b
  b
   b: searching for copy revision for a
   b: copy a:b80de5d138758541c5f05265ad144ab9fa86d1db
  committed changeset 5:89e8e4be0de296fa3d6dd7825ccc44d7dc0f1f3b

  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  4 files, 6 changesets, 4 total revisions

  $ hg export --git tip
  # HG changeset patch
  # User test
  # Date 0 0
  # Node ID 89e8e4be0de296fa3d6dd7825ccc44d7dc0f1f3b
  # Parent  7fc86ba705e717a721dbc361bf8c9bc05a18ca2f
  5
  
  diff --git a/b b/b
  new file mode 100644