[MERGE] knit performance improvements

[Robert Collins]

On Mon, 2006-04-03 at 17:00 +1000, Martin Pool wrote:
> On  3 Apr 2006, Robert Collins <robertc at robertcollins.net> wrote:
> > This patch makes knits more performant in a number of ways.
> > 
> > It contains:
> >  * A tweak to missing that I commited in here by mistake which defers
> > taking write locks unless needed.
> >    (I'll update that to not conflict with Aarons patch if his has been
> >     merged).
> >  * Various microoptimisations to knit and gzip - reducing function call 
> >    counts in inner loops, reducing double-handling of data, increasing
> >    knit header parsing performance, removing 'list.index' calls
> >    completely etc.
> >  * changes the data format of knits to remove an extraneous \n in the 
> >    compressed content data, which lets it be trivially pulled into 
> >    memory in a single 'readlines()' call.
> 
> Does this mean it's incompatible with any existing knits people might
> have?  (It's ok if it is since it's still experimental -- I just
> wanted to check.)

Yes. Its the last such change I have planned, other than nagging you to
get the stores escaping in.

Rob

-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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