view tests/test-basic.t @ 32477:20c1c2fb8106

hidden: simplify the computation of consistency blocker

For a couple of years, we now have precomputed set for all mutable phases. We
can use this set restrict our search and quickly detect non-hideable children of
hideable changesets.  This speeds up the hidden computation. See docstring of
the new function for details.

This new version reuses the '_domainancestors' function to keep the computation
of revealed changeset in O(len(visible))

Below are perfvolatilesets timing from two Mozilla repositories with different
contents. hidden cache is disabled while obtaining them.

1) Mozilla repository with:
 * 400667 changesets
 * 35 hidden changesets (first rev-268334)
 * 288 visible drafts
 * 1 unstable changeset

Before:
! visible
! wall 0.001744 comb 0.000000 user 0.000000 sys 0.000000 (best of 1563)

After:
! visible
! wall 0.000742 comb 0.000000 user 0.000000 sys 0.000000 (best of 3755)


The timing above include the computation of obsolete changeset:
! obsolete
! wall 0.000396 comb 0.000000 user 0.000000 sys 0.000000 (best of 6816)

So adjusted time give 1.3ms before versus 0.3ms after. A 4x speedup.

2) Mozilla repository with:
 * 405645 changesets
 * 4312 hidden changesets (first rev-326004)
 * 264 visible drafts
 * 1 unstable changeset

Before:
! visible
! wall 0.025476 comb 0.030000 user 0.030000 sys 0.000000 (best of 111)


After
! visible
! wall 0.007703 comb 0.010000 user 0.010000 sys 0.000000 (best of 358)


The timing above include the computation of obsolete changeset:
! obsolete
! wall 0.006408 comb 0.010000 user 0.010000 sys 0.000000 (best of 404)

So adjusted time give 19ms before versus 1.3ms after. A 17x speedup.

Create a repository:

  $ hg config
  devel.all-warnings=true
  devel.default-date=0 0
  largefiles.usercache=$TESTTMP/.cache/largefiles (glob)
  ui.slash=True
  ui.interactive=False
  ui.mergemarkers=detailed
  ui.promptecho=True
  web.address=localhost
  web\.ipv6=(?:True|False) (re)
  $ hg init t
  $ cd t

Prepare a changeset:

  $ echo a > a
  $ hg add a

  $ hg status
  A a

Writes to stdio succeed and fail appropriately

#if devfull
  $ hg status 2>/dev/full
  A a

  $ hg status >/dev/full
  abort: No space left on device
  [255]

  $ hg status >/dev/full 2>&1
  [1]

  $ hg status ENOENT 2>/dev/full
  [1]
#endif

  $ hg commit -m test

This command is ancient:

  $ hg history
  changeset:   0:acb14030fe0a
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     test
  

Verify that updating to revision 0 via commands.update() works properly

  $ cat <<EOF > update_to_rev0.py
  > from mercurial import ui, hg, commands
  > myui = ui.ui.load()
  > repo = hg.repository(myui, path='.')
  > commands.update(myui, repo, rev=0)
  > EOF
  $ hg up null
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ python ./update_to_rev0.py
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg identify -n
  0


Poke around at hashes:

  $ hg manifest --debug
  b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 644   a

  $ hg cat a
  a

Verify should succeed:

  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  1 files, 1 changesets, 1 total revisions

At the end...

  $ cd ..