view README @ 24862:c82d88dfaf59 stable

annotate: always adjust linkrev before walking down to parents (issue4623)

This should avoid the bad performance in the following scenario. Before this
patch, on "hg annotate -r10000", p.rev() would walk changelog from 10000 to 3
because _descendantrev was 10000. With this patch, it walks from 5 to 3.

  1 -- 2 -- 4 -- 5 -- ... -- 10000
    \      'p'  'f'
     - 3   (grafted 3 to 4)
      'p'

repo:    https://hg.mozilla.org/releases/mozilla-beta/#4f80fecda802
command: hg annotate -r b0a57152fd14 browser/app/profile/firefox.js
before:  83.120 secs
after:    3.820 secs

This patch involves extra calls of narrow _adjustlinkrev(), but the cost of
them seems relatively small compared to wide _adjustlinkrev() calls eliminated
by this patch.

repo:    http://selenic.com/repo/hg/#8015a3cf1380
command: hg annotate mercurial/commands.py
before:  7.380 secs
after:   7.320 secs

repo:    https://hg.mozilla.org/mozilla-central/#f214df6ac75f
command: hg annotate layout/generic/nsTextFrame.cpp
before:  5.070 secs
after:   5.050 secs

repo:    https://hg.mozilla.org/releases/mozilla-beta/#4f80fecda802
command: hg annotate -r 4954faa47dd0 gfx/thebes/gfxWindowsPlatform.cpp
before:  1.600 secs
after:   1.620 secs

Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing:

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.