Bug ID: JDK-8344577 Virtual thread tests are timing out on some macOS systems

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JDK 21	JDK 24
21.0.10Fixed	24 b26Fixed

Tests:
 - java/lang/Thread/virtual/stress/ParkALot.java#id0
 - java/lang/Thread/virtual/stress/GetStackTraceALotWhenBlocking.java#id0

Nothing to go on in the logs.

2024-11-19T19:10:00.941008Z 1 thread(s) ...
Timeout signalled after 480 seconds
----------System.err:(0/0)----------


2024-11-19T19:29:25.073652Z => 60709 of 100000
2024-11-19T19:29:26.098611Z => 60750 of 100000
Timeout signalled after 1200 seconds
2024-11-19T19:29:27.108925Z => 60785 of 100000
...

Fix request (21u): As I've seen the mentioned tests failing on x86 mac hardware in our CI, I'd like to backport these test updates to 21u, as far as they apply (some tests do not exist in 21). Risk is low, change is test-only. Went through SAP's nightlies and GHA without issues spotted.
08-10-2025
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk21u-dev/pull/2297 Date: 2025-10-06 12:20:08 +0000
06-10-2025
Changeset: a032de29 Branch: master Author: Alan Bateman <alanb@openjdk.org> Date: 2024-11-25 15:34:13 +0000 URL: https://git.openjdk.org/jdk/commit/a032de2904baf83143415858ed7191549c659035
25-11-2024
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/22357 Date: 2024-11-25 07:30:41 +0000
25-11-2024
The GHA failure is GetStackTraceALotWhenBlocking.java. It looks like it's the older test and pre-dates the dial down in JDK-8344143. As regards the latest timeouts then GetStackTraceALotWhenBlocking.java and ParkALot.java are executing really slowly and concurrently with other tests (the jtreg run is -concurrency:4). The system 16GB, I'm trying to see if the system is over provisioned and swapping.
20-11-2024
GHA report the same failure. https://github.com/sendaoYan/jdk-ysd/actions/runs/11913079369/job/33200447221
20-11-2024

Relates :	JDK-8344143 - Test jdk/java/lang/Thread/virtual/stress/GetStackTraceALotWhenPinned.java timed out on macosx-x64
Relates :	JDK-8366893 - java/lang/Thread/virtual/stress/GetStackTraceALotWhenPinned.java timed out on macos-aarch64