view README @ 22449:da05fe01170b

revset: make descendants() lazier

Previously descendants() would force the provided subset to become a set.  In
the case of revsets like '(%ld::) - (%ld)' (as used by histedit) this would
force the '- (%ld)' set to be evaluated, which produced a set containing every
commit in the repo (except %ld). This takes 0.6s on large repos.

This changes descendants to trust the subset to implement __contains__
efficiently, which improves the above revset to 0.16s. Shaving 0.4 seconds off
of histedit.

revset #27: (20000::) - (20000)
0) obsolete feature not enabled but 54243 markers found!
! wall 0.023640 comb 0.020000 user 0.020000 sys 0.000000 (best of 100)
1) obsolete feature not enabled but 54243 markers found!
! wall 0.019589 comb 0.020000 user 0.020000 sys 0.000000 (best of 100)

This commit removes the final revset related perf hotspot from histedit.
Combined with the previous two patches, they shave a little over 3 seconds off
histedit on large repos.

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.