[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4129: Windows CircleCI tests should make use of multicore runners

[Tahoe-LAFS]

#4129: Windows CircleCI tests should make use of multicore runners
---------------------------+---------------------------
 Reporter:  hacklschorsch  |          Owner:
     Type:  enhancement    |         Status:  new
 Priority:  normal         |      Milestone:  undecided
Component:  unknown        |        Version:  n/a
 Keywords:                 |  Launchpad Bug:
---------------------------+---------------------------
 We [https://github.com/tahoe-lafs/tahoe-
 lafs/blob/e27a8300d91c78ab4b8f54affa5b4d064901caf7/.circleci/config.yml#L738
 run windows tests on CircleCI on a "large" resources class] (30 GB RAM, 8
 cores), yet [https://github.com/tahoe-lafs/tahoe-
 lafs/blob/e27a8300d91c78ab4b8f54affa5b4d064901caf7/.circleci/config.yml#L305
 we don't specify the `--jobs` parameter to make tests run in parallel].

 We should:  We run tests in parallel in other configurations without
 problems, and we want our tests to be fast (in wall time) and cheap (since
 runners are paid by the minute).

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4129>
Tahoe-LAFS <https://Tahoe-LAFS.org>
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