RFR: 8290531: Loom: Parallelize a few tests more deeply

[Jaikiran Pai]

On Tue, 19 Jul 2022 12:52:11 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Some of the newly added Loom tests are long-running, and thus they delay the completion of otherwise very parallel tier1/jdk_loom. We can parallelize them a bit better to avoid these testing stalls. 
> 
> Improvements on Linux x86_64, TR 3970X, `jdk_loom hotspot_loom`:
> 
> 
> # release before
> real 4m41.424s
> user 24m18.064s
> sys 1m16.440s
> 
> # release after
> real 2m47.769s   ; -40%
> user 23m44.622s
> sys 1m15.240s
> 
> 
> # fastdebug before
> real 5m38.078s
> user 67m23.516s
> sys 1m56.446s
> 
> # fastdebug after
> real 4m9.249s    ; -26%
> user 67m21.940s
> sys 1m57.625s

Marked as reviewed by jpai (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/9554