[MERGE] intern() various file_id/revision_id

[John Arbash Meinel]

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Martin Pool wrote:
> Martin Pool has voted resubmit.
> Status is now: Resubmit
> Comment:
> Basically every time I've tried string interning in Python it's been a
> disappointment, even in cases where it would very likely have helped to
> do the equivalent in Java or Lisp.  So I'm skeptical of merging this
> unless you have at least ad hoc measurements that it does help.
> 
> I think you have to get a pretty high hit rate to overcome the
> apparently high overhead of interning them.
> 
> I'm going to mark it resubmit to get it off my queue, but you can merge
> if you find it's useful.
> 
> For details, see:
> http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C49ADFD32.2070408%40arbash-meinel.com%3E
> 
> Project: Bazaar
> 
> 

So at the least, I'm sure changing the one in xml8.py is worthy, as we
are already effectively doing an intern, only with a dictionary that
never expires. (intern() strings die when the last non-intern reference
disappears.)

John
=:->

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