notes/plan for hpss performance work

[Robert Collins]

On Thu, 2008-05-01 at 15:59 +1000, Martin Pool wrote:
> 
>  * Perhaps surprisingly, graph operations are not showing up as
> dominant, at least in the cases we did here: pushing just one
> revision, and pushing all of history.  If you have two branches with
> substantial different history on both sides it may be more important,
> but there is plenty of low fruit before getting into that.  We spend a
> lot of time in graph operations for diverged branches but it seems
> totally unnecessary, as we should already know they're diverged.

Note that graph operations are asymmetric: what is slow for push and
pull are different. (This is why abentley is noting that graph
operations are a problem for deep histories).

-Rob

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