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cow: CopyOnWriteArrayList - deterministic iterator-snapshot and synchronizedList CME demos, JMH read/write throughput, and the addLast/removeFirst fix for a real concurrent-writer race

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Claude
2026-10-01 12:09:44 +00:00
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cow/output/05-write-throughput-jmh.txt
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Benchmark (container) (size) Mode Cnt Score Error Units
WriteThroughputBenchmark.addRemove_fourConcurrentWriters COW 10 thrpt 3 2442.460 ± 10099.500 ops/ms
WriteThroughputBenchmark.addRemove_fourConcurrentWriters COW 1000 thrpt 3 404.113 ± 92.677 ops/ms
WriteThroughputBenchmark.addRemove_fourConcurrentWriters SYNC 10 thrpt 3 4256.370 ± 11472.184 ops/ms
WriteThroughputBenchmark.addRemove_fourConcurrentWriters SYNC 1000 thrpt 3 2431.519 ± 10671.130 ops/ms
WriteThroughputBenchmark.addRemove_oneWriter COW 10 thrpt 3 8590.710 ± 3673.510 ops/ms
WriteThroughputBenchmark.addRemove_oneWriter COW 1000 thrpt 3 692.991 ± 1173.810 ops/ms
WriteThroughputBenchmark.addRemove_oneWriter SYNC 10 thrpt 3 17149.052 ± 26734.246 ops/ms
WriteThroughputBenchmark.addRemove_oneWriter SYNC 1000 thrpt 3 11819.476 ± 794.382 ops/ms