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10.2 Rigorous Microbenchmarking with JMH
Topic Summary
Avoid common benchmarking traps (dead code elimination, constant folding) using Java Microbenchmark Harness.
What You Will Learn
• Understand why `System.currentTimeMillis()` is invalid for microbenchmarks.
• Prevent Dead Code Elimination using `Blackhole`.
• Run warmup iterations to reach C2 JIT steady-state.
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