RFR: JDK-8299052: ViewportOverlapping test fails intermittently on Win10 & Win11

[Alexey Ivanov]

On Wed, 21 Dec 2022 17:25:20 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

>> test/jdk/TEST.ROOT line 36:
>> 
>>> 34: com/sun/net/httpserver/simpleserver \
>>> 35: java/awt \
>>> 36: javax/swing
>> 
>> Hello Harshitha, I don't have any knowledge of the client area, but I see that there are a large number of tests that are present in `test/jdk/java/awt` and `test/jdk/javax/swing`. Adding these 2 directories to `exclusiveAccess.dirs` would mean that none of the tests in `java/awt` will be run when any other test in `java/awt` is currently in progress. Same with the `javax/swing` directory. So it could increase the duration of the tiers in which these tests run. Is there a CI run which shows if this changes the test run duration drastically?
>
> @jaikiran Thank you for the details. I'll check if the duration of run differed drastically. I thought all the client tests run in non-concurrent mode by default or does this differ for headful and headless test?

*Headful* tests are not supposed concurrently: they display UI and often use Robot to send input events to the UI. Running such tests concurrently leads to obscure failures. In our CI system, `JTREG_JOBS=1` is passed to `make` when running headful tests.

There's a set of *headless* tests which can be run concurrently. Such tests will be affected if they're run concurrently.

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PR: https://git.openjdk.org/jdk/pull/11747