[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2845: Run tests in parallel

[Tahoe-LAFS]

#2845: Run tests in parallel
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     Reporter:  rvs          |      Owner:  rvs
         Type:  enhancement  |     Status:  assigned
     Priority:  normal       |  Milestone:  soon
    Component:  code         |    Version:  n/a
   Resolution:               |   Keywords:  tox test easy review-needed
Launchpad Bug:               |
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Comment (by warner):

 The github PR is showing failures on the integration tests: I think
 they're more sensitive to concurrency, so we probably can't enable it for
 those.

 Also it looks like `trial -j` causes `_trial_temp/test.log` to be split
 into several pieces (one per worker, in files like
 `_trial_temp/0/test.log` and `_trial_temp/1/test.log`). I believe our
 buildbot reads from `test.log` to count various things, so we may need to
 rewrite some tooling to handle that. But the speedup is so impressive, I
 think it's worth the effort.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2845#comment:5>
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