RFR: 8273433: Enable parallelism in vmTestbase_nsk_sysdict tests

[Aleksey Shipilev]

On Wed, 8 Sep 2021 00:58:19 GMT, David Holmes <dholmes at openjdk.org> wrote:

> I suspect it was simply the fact that these were stress tests that resulted in them being executed in isolation. Otherwise if the concurrency level is just wrong I would expect these to cause intermittent failures when run in parallel. 

Yeah, I generally agree with this. Blind parallelism improvements should not be done, and we should only allow the stress tests that are not heavy on resources to run in parallel. The tests affected in this PR seem to be rather short, effectively single-threaded, and memory-dense tests, so they seem to qualify for this kind of relaxation. I'll wait for Misha to respond.

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PR: https://git.openjdk.java.net/jdk/pull/5389