Speedup with history-db

[Eli Zaretskii]

> Date: Fri, 27 May 2011 16:49:35 +0200
> From: John Arbash Meinel <john at arbash-meinel.com>
> CC: bazaar at lists.canonical.com
> 
> >   13.578  history_db post-change-hook took 1.638s (0.012s to get_config, 1.526s to init, 0.100s to import)
> >   13.578  Stats:
> >   {'num_search_tips': 0,
> >    'step mainline': 1,
> >    'step mainline added': 4,
> >    'step mainline cache missed': 1,
> >    'step mainline initial': 1}
> >   [ 4216] 2011-05-27 17:06:14.640 INFO: Tree is up to date at revision 104384 of branch bzr+ssh://eliz@bzr.savannah.gnu.org/emacs/trunk
> > 
> > What is it trying to do for 1.6s?
> 
> If you have a branch that has not been imported before, bzr-history-db
> is importing it into the db now.

There's no branch that wasn't imported before.

> Note that it did find 4 revisions that were not present in the
> ancestry.

Is there any way to find out the revision IDs of those revisions?  I'd
like to see what they are.

> Counting the whole revision table is stupid. I just committed what
> should be a fix for that (revno 135).

Thanks.  This slashed the time significantly, but bzr consistently
says it imports 4 revisions each time I do a "bzr up" with no new
revisions available in the remote repo:

  9.360  fetch up to rev {rgm at gnu.org-20110527071815-pnm36i0e38mb8wte}
  11.766  history_db post-change-hook took 0.246s (0.002s to get_config, 0.096s to init, 0.148s to import)
  11.766  Stats:
  {'num_search_tips': 0,
   'step mainline': 1,
   'step mainline added': 4,
   'step mainline cache missed': 1,
   'step mainline initial': 1}
  [ 3688] 2011-05-27 18:06:55.062 INFO: Tree is up to date at revision 104384 of branch bzr+ssh://eliz@bzr.savannah.gnu.org/emacs/trunk

It looks like something else is at work here.