RFR: 8360160: ubuntu-22-04 machine is failing client tests [v3]

[Phil Race]

On Wed, 10 Dec 2025 20:02:34 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> There was a prior PR that attempted to fix this issue, but it was found that [JDK-8280987](https://bugs.openjdk.org/browse/JDK-8280987) was the more reasonable cause. The issue was caused by Ubuntu instances having a large amount of graphics configurations, hence a large amount of concurrent frames being open and tested on at a time. As such, the newly suggested fix was to instead break apart the test into batches.
>> 
>> This change creates and disposes of the test frames in batches of 20, up to the number of GC's identified. The original problem was recreated when testing on Ubuntu 24.04, and I have re-tested this with the updated test on the same device, and it passes. When debugging, 140 GC's were identified and all 140 frames were created and disposed of. Also tested this on macOS 15 and the test also passes. CI looks good as well.
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Space out batches of frames

test/jdk/java/awt/Frame/FrameVisualTest.java line 67:

> 65:         System.out.println("frames.length: " + frames.length);
> 66: 
> 67:         // Iterate through gcs in batches of 20

maybe we could have a var for this ? Perhaps even allow it to be set as a program arg even if you default to 20.
Also wouldn't one at a time be the most stable ?
Finally, is it even necessary to test ALL of them ? Isn't it sufficient to test 30-40 and call it a day ?

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PR Review Comment: https://git.openjdk.org/jdk/pull/28646#discussion_r2612141387