yum-presto not on by default

[Ben Boeckel]

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Seth Vidal wrote:
>> Does yum-presto make use of multiple cores when rebuilding the 
RPMs?
>> (My machines only have one, so I can't tell.)
> 
> other than the xz compression part I believe most of the time is 
> disk bound, not cpu bound.
> 
> -sv
> 

The rpmrebuild operation has saturated one of my 3.0GHz Intel Core 
2 Duo cores for at least a minute on large updates, so my guess is 
that that part is not multithreaded and CPU bound.

- --Ben
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