yum-presto not on by default

[drago01]

On Sun, Oct 4, 2009 at 10:42 PM, Eric Springer <erikina at gmail.com> wrote:
> On Mon, Oct 5, 2009 at 5:05 AM, Adam Williamson <awilliam at redhat.com> wrote:
>>
>> Quick follow-up on this issue: I heard that this part at least has been
>> done, and it certainly seems to have done the trick. Delta rebuild
>> speeds have increased approx ten-fold here, and are now faster than my
>> (pretty quick) download speeds.
>
> Is it possible to do the rebuilds in parallel? I noticed that only one
> of my four cores was used. And that on smolt 63% of people have a
> dual-core or greater, so it could lead to massive speed-ups as well.

xz is not threaded yet, I did some benchmark on my core i7 systems:

http://193.200.113.196/apache2-default/res

pbzip2 and pigz are threaded (compare them with bzip2 and gzip in the
output to see what kind of speedup is possible).