D1622: transaction: Use intbitset for implementing changes['phase']

[quark (Jun Wu)]

quark added a comment.


  Although this is definitely better for the clone case. intbitset does not seem to implement segmented bitsets so the memory usage could in theory be worse for other cases.

INLINE COMMENTS

> localrepo.py:1283
>          tr.changes['obsmarkers'] = set()
> -        tr.changes['phases'] = [set() for i in range(7)]
> +        tr.changes['phases'] = [intbitset() for i in range(6)]
>          tr.changes['bookmarks'] = {}

It's still worthwhile to have `set()` as a fallback. So the code runs in pure python or pypy environment

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1622

To: joerg.sonnenberger, #hg-reviewers
Cc: quark, mercurial-devel