[MERGE] Make 'bzr co' more memory sensitive

[John Arbash Meinel]

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Matthew D. Fuller wrote:
> On Fri, Oct 03, 2008 at 11:57:37AM -0500 I heard the voice of
> John Arbash Meinel, and lo! it spake thus:
>> The difference isn't huge, though:
>> real    1m42.557s
>> vs
>> real    2m6.050s
> 
> A 23.5% increase is pretty close to 'huge'...
> 
> 

Well, when I tested again I was getting 1m20s versus 1m25s. So yeah, it
is a regression depending on how the repository is laid out. Weight that
against 200MB versus 760MB for checkout. If you hit swap, there is
little contest.

John
=:->

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