[sup-talk] [PATCH] cache results of Person.from_address

[Rich Lane]

Excerpts from William Morgan's message of Sat Aug 22 10:10:04 -0400 2009:
> This looks good. Two minor questions before I apply:
> 
> Reformatted excerpts from Rich Lane's message of 2009-08-16:
> > The regexes in this function are very expensive, so caching improves
> > performance significantly for queries and slightly for indexing.
> 
> When you say this affects query performance, is it just the contact-list
> query, or is there some other mechanism by which this is slowing down
> regular queries?

Actually, your question prompted me to wonder why we're calling
Person.from_address on this path at all. With a little support from
Message we can completely avoid Message#parse_header. I've just sent in
a patch that does this. Please apply that rather than the from_address
cache.

The performance improvement from the new patch is slightly better than
that of the cache. Depending on the benchmark I see the time taken by
ThreadIndexMode#load_n_threads decrease by 1/2 to 2/3.