RFR: 8247980: Exclusive execution of java/util/stream tests slows down tier1

[Aleksey Shipilev]

On Wed, 15 Sep 2021 15:09:45 GMT, Arno Zeller <azeller at openjdk.org> wrote:

>> See the bug report for more details. I would appreciate if people with their corporate testing systems would run this through their systems to avoid surprises. (ping @RealCLanger, @iignatev).
>
> I haven't recognized problems I can directly match to this change.
> But I should also state, that we parallelize not by using several agents in one jtreg tests - we use no agents and do not set concurrency. Currently we split the jtreg test in groups and each group is executed by a jtreg runner with concurrency one. But the runner do run in parallel if the machine is big enough.
> With this setup I do not expect influence by your change because we still execute the test in serial order - even after this change.
> At least that is how I understand the effect of exclusiveAccess.dirs .

All right, thank you @ArnoZeller!

@iignatev, @PaulSandoz, @AlanBateman -- are you good with integrating this?

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PR: https://git.openjdk.java.net/jdk/pull/5189