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

[Aleksey Shipilev]

On Tue, 26 Jul 2022 10:16:31 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

>> test/jdk/java/nio/channels/vthread/BlockingChannelOps.java line 36:
>> 
>>> 34:  * @test id=useDirectRegister
>>> 35:  * @bug 8284161
>>> 36:  * @summary Basic tests of virtual threads doing blocking I/O with NIO channels
>> 
>> Hello Aleksey, I see that previously the `@bug` and `@summary` was only there on one test definition. So maybe remove this duplicated `@bug` and `@summary` from this new test definition?
>> Other than that, this test change looks OK to me.
>
> On a related note - I had a brief look at the jtreg docs including the FAQ https://openjdk.org/jtreg/faq.html and I don't see any mention about how it treats multiple test definitions in a single source file, when it comes to running them concurrently. But I believe you have more experience with it and have already tested the difference in parallelism, so I think what you suggest here is fine.

Yes, this is a usual thing to replicate the test sections. It is also a usual practice to copy-paste the entirety of run definition/config.

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