java - JMH difference between Sample and SingleShot -


what's difference between setting mode.sample , mode.singleshot measurementiterations set large number? same or there quantitive difference between 2 modes?

but... javadoc states difference quite specifically?

sample time: samples time each operation.

runs continuously calling {@link benchmark} methods, , randomly samples time needed call. mode automatically adjusts sampling frequency, may omit pauses missed sampling measurement. mode time-based, , run until iteration time expires.

and:

single shot time: measures time single operation.

runs calling {@link benchmark} once , measuring time. mode useful estimate "cold" performance when don't want hide warmup invocations, or if want see progress call call, or want record every single sample. mode work-based, , run single invocation of {@link benchmark} method.

caveats mode include:

  • more warmup/measurement iterations required.
  • timers overhead might significant if benchmarks small; switch {@link #sampletime} mode if problem.

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