view tests/test-obsolete-tag-cache.t @ 24560:b38bcf18993c

dirstate.walk: don't keep track of normalized files in parallel

Rev 2bb13f2b778c changed the semantics of the work list to store (normalized,
non-normalized) pairs. All the tuple creation and destruction hurts perf: on a
large repo on OS X, 'hg status' went from 3.62 seconds to 3.78.

It also is unnecessary in most cases:
- it is clearly unnecessary on case-sensitive filesystems.
- it is also unnecessary when filenames have been read off of disk rather than
  being supplied by the user.

The only case where the non-normalized case is required at all is when the file
is unknown.

To eliminate most of the perf cost, keep trace of whether the directory needs
to be normalized at all with a boolean called 'alreadynormed'. Pay the cost of
directory normalization only when necessary.

For the above large repo, 'hg status' goes to 3.63 seconds.

  $ cat >> $HGRCPATH << EOF
  > [extensions]
  > rebase=
  > 
  > [experimental]
  > evolution = createmarkers
  > EOF

Create a repo with some tags

  $ hg init repo
  $ cd repo
  $ echo initial > foo
  $ hg -q commit -A -m initial
  $ hg tag -m 'test tag' test1
  $ echo first > first
  $ hg -q commit -A -m first
  $ hg tag -m 'test2 tag' test2
  $ hg -q up -r 0
  $ echo newhead > newhead
  $ hg commit -A -m newhead
  adding newhead
  created new head

Trigger tags cache population by doing something that accesses tags info

  $ hg log -G -T '{rev}:{node|short} {tags} {desc}\n'
  @  4:042eb6bfcc49 tip newhead
  |
  | o  3:c3cb30f2d2cd  test2 tag
  | |
  | o  2:d75775ffbc6b test2 first
  | |
  | o  1:5f97d42da03f  test tag
  |/
  o  0:55482a6fb4b1 test1 initial
  

  $ cat .hg/cache/tags
  4 042eb6bfcc4909bad84a1cbf6eb1ddf0ab587d41
  3 c3cb30f2d2cd0aae008cc91a07876e3c5131fd22 b3bce87817fe7ac9dca2834366c1d7534c095cf1
  
  55482a6fb4b1881fa8f746fd52cf6f096bb21c89 test1
  d75775ffbc6bca1794d300f5571272879bd280da test2

Create some hidden changesets via a rebase and trigger tags cache
repopulation

  $ hg -q rebase -s 1 -d 4
  $ hg log -G -T '{rev}:{node|short} {tags} {desc}\n'
  o  7:eb610439e10e tip test2 tag
  |
  o  6:7b4af00c3c83  first
  |
  o  5:43ac2a539b3c  test tag
  |
  @  4:042eb6bfcc49  newhead
  |
  o  0:55482a6fb4b1 test1 initial
  

.hgtags filenodes for hidden heads should be visible (issue4550)
(currently broken)

  $ cat .hg/cache/tags
  7 eb610439e10e0c6b296f97b59624c2e24fc59e30 b3bce87817fe7ac9dca2834366c1d7534c095cf1
  
  55482a6fb4b1881fa8f746fd52cf6f096bb21c89 test1
  d75775ffbc6bca1794d300f5571272879bd280da test2