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Add virtual-threads-benchmark: re-run Spring Boot 4.1 / JDK 25 benchmarks, JEP 491 pinning fixed

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Companion module for the rewritten post 'Virtual Threads on Spring Boot 4.1: The Benchmarks,
Re-Run, and the Pinning Advice That Expired', retitled and re-benchmarked on Boot 4.1.1 /
JDK 25.0.4.1 (the original post was written against Boot 3.4 / JDK 21). Covers: I/O-bound and
CPU-bound throughput (platform vs virtual threads, including a JIT-warmup benchmarking bug this
build caught and fixed), JEP 491 proof that synchronized no longer pins a virtual thread's
carrier across a blocking call as of JDK 24 (obsoleting the old avoid-synchronized advice),
proof that -Djdk.tracePinnedThreads=full is inert on JDK 25, and JEP 506's finalized ScopedValue
API (JDK 25 GA, no --enable-preview, and a different shape than the old preview API). Kept as
its own module rather than a new top-level repository, alongside the existing async/ module,
which already has a stronger dual-JDK JEP 491 proof that this module's docs cross-link to
instead of duplicating.
This commit is contained in:
asmhatre
2026-09-18 08:52:59 +00:00
parent eaa8171966
commit f506b01389
28 changed files with 1085 additions and 0 deletions
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virtual-threads-benchmark/docs/output/03b-trace-pinned-threads-removed.txt
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java -version:
openjdk version "25.0.4.1" 2026-08-18 LTS
OpenJDK Runtime Environment Temurin-25.0.4.1+1 (build 25.0.4.1+1-LTS)
OpenJDK 64-Bit Server VM Temurin-25.0.4.1+1 (build 25.0.4.1+1-LTS, mixed mode, sharing)
-- without -Djdk.tracePinnedThreads=full --
java.version=25.0.4.1
jdk.tracePinnedThreads=null
Running a virtual thread that holds a monitor across Thread.sleep(200)...
Done. If jdk.tracePinnedThreads still worked on this JDK, a pinned-thread stack trace would have printed above while the virtual thread was inside doWorkHoldingMonitor.
-- with -Djdk.tracePinnedThreads=full --
java.version=25.0.4.1
jdk.tracePinnedThreads=full
Running a virtual thread that holds a monitor across Thread.sleep(200)...
Done. If jdk.tracePinnedThreads still worked on this JDK, a pinned-thread stack trace would have printed above while the virtual thread was inside doWorkHoldingMonitor.
RESULT: no pinned-thread stack trace was printed by either run -- the flag is inert on this JDK, consistent with JEP 491