RFR: 8318603: Parallelize sun/java2d/marlin/ClipShapeTest.java [v2]

[Alexey Ivanov]

On Fri, 9 Feb 2024 02:17:01 GMT, Phil Race <prr at openjdk.org> wrote:

> > I ran the test in our CI and I didn't notice an improvement.
> 
> Did you run jdk:tier4 like Sergey was doing ?

No, I ran just this single test. I don't know how Sergey is running the test.

> Our CI runs some number of (headless) tests in parallel (I am not sure but think it is by default 4) and this might change the whole dynamics of "which test is run last", compared to other test frameworks.

Yep, I know that headless tests are run in parallel, which makes perfect sense.

> I don't know if whatever Sergey is using does the same, but they could be quite different in the number of CPUs per VM.
> 
> If you ran just the _one_ test and it was no faster (wall-clock time) that suggests the (sub-)tests were not being run in parallel which would be interesting .. and we might want to ask jtreg folks for input.

Yes, I submitted a job with one test only.

At the same time, I didn't look thoroughly into the logs.

This .java file contains four different tests which can be run in parallel, it could save the overall time; in the worst case, the same four tests are run consecutively. No negative impact, so I support the change.

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PR Comment: https://git.openjdk.org/jdk/pull/17719#issuecomment-1935920902