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package scala.collection.immutable
import java.util.concurrent.TimeUnit
import org.openjdk.jmh.annotations._
object ListBenchmark {
case class Content(value: Int)
}
@BenchmarkMode(Array(Mode.AverageTime))
@Fork(2)
@Threads(1)
@Warmup(iterations = 10)
@Measurement(iterations = 10)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Benchmark)
class ListBenchmark {
import ListBenchmark._
@Param(Array("0", "1", "10", "100", "1000"))
var size: Int = _
var values: List[Content] = _
var mid: Content = _
var last: Content = _
@Setup(Level.Trial) def initKeys(): Unit = {
values = List.tabulate(size)(v => Content(v))
mid = Content(size / 2)
last = Content(Math.max(0,size -1))
}
@Benchmark def filter_includeAll: Any = {
values.filter(v => true)
}
@Benchmark def filter_excludeAll: Any = {
values.filter(_ => false)
}
@Benchmark def filter_exc_mid: Any = {
values.filter(v => v.value != mid.value)
}
@Benchmark def filter_from_mid: Any = {
values.filter(v => v.value <= mid.value)
}
@Benchmark def filter_exc_last: Any = {
values.filter(v => v.value != last.value)
}
@Benchmark def filter_only_last: Any = {
values.filter(v => v.value == last.value)
}
@Setup(Level.Trial) def initKeys(): Unit = {
values = List.tabulate(size)(n => if (n == size / 2) "mid" else "")
}
@Benchmark def mapConserve_identity: Any = {
values.mapConserve(x => x)
}
@Benchmark def mapConserve_modifyAll: Any = {
values.mapConserve(x => "replace")
}
@Benchmark def mapConserve_modifyMid: Any = {
values.mapConserve(x => if (x == "mid") "replace" else x)
}
}
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