advancedJVM Internals & Memory
What is JMH and what does it handle that a hand-rolled benchmark doesn't?
JMH (Java Microbenchmark Harness) automatically handles JIT warm-up iterations, runs multiple JVM forks for fresh state, computes statistical variance, and uses a Blackhole to prevent the JIT from eliminating your benchmarked code as dead code — all things a naive timing loop gets wrong.
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