RFR: 8272970: Parallelize runtime/InvocationTests/ [v2]

[David Holmes]

On Wed, 1 Sep 2021 08:01:20 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Current runtime/InvocationTests/ are long and serial. They take about half an hour on a modern desktop, mostly using a single CPU. They can be parallelized better, at least on sub-test level. This would be important as [JDK-8272914](https://bugs.openjdk.java.net/browse/JDK-8272914) would start to run them in tier3.
>> 
>> Sample run times:
>> 
>> 
>> $ time CONF=linux-x86_64-server-fastdebug make run-test TEST=runtime/InvocationTests/
>> 
>> # Before
>> real	32m2.188s
>> user	59m12.818s
>> sys	0m45.612s
>> 
>> # After
>> real	17m21.110s
>> user	63m31.851s
>> sys	0m55.391s
>> 
>> 
>> I think we can technically go even deeper, for example parallelising by `packageSet` in the generators themselves, but that would be much more intrusive. I think 17 minutes is already quite good, given other tests running in prospective `hotspot:tier3`.
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Merge branch 'master' into JDK-8272970-parallel-invocation-tests
>  - Trim down redundant compile tags
>  - 8272970: Parallelize runtime/InvocationTests/

Marked as reviewed by dholmes (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5250