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Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

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Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
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asmhatre
2026-09-21 15:08:50 +00:00
committed by Claude
co-authored by Claude Sonnet 5
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# 4 virtual threads on ONE carrier, each sleeping 200 ms inside synchronized (JEP 491, Java 24)
$ java -Djdk.virtualThreadScheduler.parallelism=1 -Djdk.virtualThreadScheduler.maxPoolSize=1 PinningDemo (JDK 21)
java.version = 21.0.12.1
4 virtual threads, 1 carrier, sleep(200) inside synchronized: SERIALISED (pinned): about 4 x 200 ms
$ java -Djdk.virtualThreadScheduler.parallelism=1 -Djdk.virtualThreadScheduler.maxPoolSize=1 PinningDemo (JDK 25)
java.version = 25.0.4.1
4 virtual threads, 1 carrier, sleep(200) inside synchronized: OVERLAPPED (not pinned): about 200 ms
$ java -Djdk.virtualThreadScheduler.parallelism=1 -Djdk.virtualThreadScheduler.maxPoolSize=1 PinningDemo (JDK 26)
java.version = 26.0.2.1
4 virtual threads, 1 carrier, sleep(200) inside synchronized: OVERLAPPED (not pinned): about 200 ms
$ java -Djdk.virtualThreadScheduler.parallelism=1 -Djdk.virtualThreadScheduler.maxPoolSize=1 PinningDemo (JDK 27)
java.version = 27
4 virtual threads, 1 carrier, sleep(200) inside synchronized: OVERLAPPED (not pinned): about 200 ms
$ java -Djdk.virtualThreadScheduler.parallelism=1 -Djdk.virtualThreadScheduler.maxPoolSize=1 PinningDemo (JDK 23, Corretto image)
java.version = 23.0.2
4 virtual threads, 1 carrier, sleep(200) inside synchronized: SERIALISED (pinned): about 4 x 200 ms
$ java -Djdk.virtualThreadScheduler.parallelism=1 -Djdk.virtualThreadScheduler.maxPoolSize=1 PinningDemo (JDK 24, Corretto image)
java.version = 24.0.2
4 virtual threads, 1 carrier, sleep(200) inside synchronized: OVERLAPPED (not pinned): about 200 ms