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package scala.collection.immutable
import java.util.concurrent.TimeUnit
import org.openjdk.jmh.annotations._
import org.openjdk.jmh.infra._
@BenchmarkMode(Array(Mode.AverageTime))
@Fork(2)
@Threads(1)
@Warmup(iterations = 10)
@Measurement(iterations = 10)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Benchmark)
class SetBenchmark {
var base: Set[String] = _
@Setup(Level.Trial) def initKeys(): Unit = {
base = Set("a", "b", "c", "d")
}
// immutable map is implemented as EmptySet -> Set1 -> Set2 -> Set3 -> Set4 -> HashSet
// add an extra entry to Set4 causes a lot of work, benchmark the transition
@Benchmark def set4AddElement(bh: Blackhole): Unit = {
bh.consume(base + "e")
}
}
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