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Rule 7: Reduce noise in your measurements. Run your benchmark on a quiet machine, and run it several times, discarding outliers. Use -Xbatch to serialize the compiler with the application, and consider setting -XX:CICompilerCount=1 to prevent the compiler from running in parallel with itself.
Relevant links
- http://www.ibm.com/developerworks/java/library/j-jtp02225/index.html
(Brian Goetz article) - http://www.azulsystems.com/events/javaone_2002/microbenchmarks.pdf (Cliff Click JavaOne talk)
- http://code.google.com/p/caliper/wiki/JavaMicrobenchmarks (Google micro-benchmark tool)
- http://stackoverflow.com/questions/504103/how-do-i-write-a-correct-micro-benchmark-in-java (crowd-sourced goodness)
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