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

[Damon Nguyen]

On Fri, 12 Dec 2025 07:29:58 GMT, Alexander Zvegintsev <azvegint at openjdk.org> wrote:

>> Good point. I have switched to a single frame at a time and have created a new final var to limit the number of frames to test (30). When testing, the balance of stability and testing duration felt reasonable. The test still creates, tests, and disposes multiple frames on Ubuntu, and the test still passes testing after the changes.
>
>> I have switched to a single frame at a time 
> 
> This makes the test much slower. On my machine, the execution time is::
> - ~33s with the one at a time version
> - ~10s for version with all gcs in batches of 20 
>  
> Few notes on placing several frames:
> <img width="1012" height="222" alt="image" src="https://github.com/user-attachments/assets/98820fd5-5c9e-4f9c-b2d4-a87681a56cb6" />
> - If they are close enough, they can cast shadows on each other.
> - If the auto-hide dock is disabled, the dock can overlap frames.  The dock auto-hide is enabled on the CI, but it would be better if it could be moved away from the screen border.

Is 33 seconds unreasonable for the test? I figured since the upper-limit of frame tests is set to 30, this 33 seconds would be the longest the test would run for. Also, the test only has 1 gc for other OS's so only 1 frame is tested for that. This avoids the shadow issue as well as creates a more stable test.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28646#discussion_r2615010816