Brett Cannon added the comment:

One thing to note is if we want to speed up things like the coverage run on 
Travis we may want to make this optionally more deterministic rather than fully 
random for the 10 selected files, otherwise coverage shifts and we can't rely 
on any coverage metrics per-PR to know if code is increasing or decreasing 
coverage. Maybe having a ``-u deterministic`` resource to take out the 
randomness for coverage runs but leave the randomness for buildbots? This might 
also require tweaking our Travis tests as they currently use the buildbot make 
rule (I think).

P.S. I bet there are also some multiprocessing tests that go a bit overboard 
that we could consider scaling back, e.g. the coverage run skips a bunch of 
tests because they seem to process the entire stdlib.

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nosy: +brett.cannon

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30417>
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