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locks: synchronized vs ReentrantLock vs StampedLock companion code

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JMH throughput sweep (1-64 threads), 9:1 read-heavy @Group benchmark,
tryLock(timeout) deadlock-avoidance demo, and a JDK21-vs-JDK25 JEP 491
virtual-thread-pinning comparison. Also promotes LICENSE to repo root
now that a second module exists.
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asmhatre
2026-09-30 06:04:50 +00:00
parent f548d9eeb5
commit 32b8067ecf
25 changed files with 763 additions and 6 deletions
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locks/output/05-read-heavy-benchmark.txt
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$ java -jar target/benchmarks.jar ReadHeavyBenchmark -rf text
(9 reader threads : 1 writer thread per lock type, via JMH @Group/@GroupThreads)
Benchmark Mode Cnt Score Error Units
ReadHeavyBenchmark.reentrantLock thrpt 5 45225.344 ± 3890.955 ops/ms
ReadHeavyBenchmark.reentrantLock:reentrantLockRead thrpt 5 39936.906 ± 3728.160 ops/ms
ReadHeavyBenchmark.reentrantLock:reentrantLockWrite thrpt 5 5288.438 ± 1952.067 ops/ms
ReadHeavyBenchmark.stampedLock thrpt 5 915584.241 ± 68486.471 ops/ms
ReadHeavyBenchmark.stampedLock:stampedLockRead thrpt 5 914889.465 ± 69210.992 ops/ms
ReadHeavyBenchmark.stampedLock:stampedLockWrite thrpt 5 694.777 ± 1802.294 ops/ms
ReadHeavyBenchmark.synchronizedCounter thrpt 5 16320.540 ± 4834.389 ops/ms
ReadHeavyBenchmark.synchronizedCounter:synchronizedRead thrpt 5 15319.823 ± 5526.566 ops/ms
ReadHeavyBenchmark.synchronizedCounter:synchronizedWrite thrpt 5 1000.717 ± 860.855 ops/ms