RFR: 8315774: Enable parallelism in vmTestbase/gc/g1/unloading tests

[Leonid Mesnik]

On Wed, 6 Sep 2023 15:41:26 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Current `vmTestbase/gc/g1/unloading` tests contain 112 tests, each running exclusively. This drags the `tier4` test times up. There seem to be no reason to run these tests exclusively, though: they complete in reasonable time, are lightly-threaded, and consume the usual amount of memory.
> 
> We should consider enabling parallelism for them and get improved test performance. Currently it is blocked by `TEST.properties` with `exclusiveAccess.dirs` directives in them.
> 
> 
> $ time CONF=linux-aarch64-server-fastdebug make test TEST="vmTestbase/gc/g1/unloading"
> 
> # Current config
>  4340.46s user 107.99s system 128% cpu 57:37.79 total
> 
> # After this patch
>  4138.37s user 84.50s system 808% cpu 8:42.62 total 
> 
> 
> Additional testing:
>  - [x] 50x Linux AArch64 fastdebug `vmTestbase/gc/g1/unloading`

Ci works fine.

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Marked as reviewed by lmesnik (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15598#pullrequestreview-1613726700