1 files changed, 70 insertions, 0 deletions
diff --git a/test/benchmarks/src/main/scala/scala/collection/mutable/HashMapBenchmark.scala b/test/benchmarks/src/main/scala/scala/collection/mutable/HashMapBenchmark.scala
new file mode 100644
index 0000000000..3f01d154e9
--- /dev/null
+++ b/test/benchmarks/src/main/scala/scala/collection/mutable/HashMapBenchmark.scala
@@ -0,0 +1,70 @@
+package scala.collection.mutable
+
+import org.openjdk.jmh.annotations._
+import org.openjdk.jmh.infra._
+import org.openjdk.jmh.runner.IterationType
+import benchmark._
+import java.util.concurrent.TimeUnit
+
+import scala.collection.mutable
+
+@BenchmarkMode(Array(Mode.AverageTime))
+@Fork(2)
+@Threads(1)
+@Warmup(iterations = 10)
+@Measurement(iterations = 10)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@State(Scope.Benchmark)
+class HashMapBenchmark {
+  @Param(Array("10", "100", "1000"))
+  var size: Int = _
+
+  var existingKeys: Array[Any] = _
+  var missingKeys: Array[Any] = _
+
+  @Setup(Level.Trial) def initKeys(): Unit = {
+    existingKeys = (0 to size).map(i => (i % 4) match {
+      case 0 => i.toString
+      case 1 => i.toChar
+      case 2 => i.toDouble
+      case 3 => i.toInt
+    }).toArray
+    missingKeys = (size to 2 * size).toArray
+  }
+
+  var map = new mutable.HashMap[Any, Any]
+
+  @Setup(Level.Invocation) def initializeMutable = existingKeys.foreach(v => map.put(v, v))
+
+  @TearDown(Level.Invocation) def tearDown = map.clear()
+
+  @Benchmark def getOrElseUpdate(bh: Blackhole): Unit = {
+    var i = 0;
+    while (i < size) {
+      bh.consume(map.getOrElseUpdate(existingKeys(i), -1))
+      bh.consume(map.getOrElseUpdate(missingKeys(i), -1))
+      i += 1
+    }
+  }
+
+  @Benchmark def get(bh: Blackhole): Unit = {
+    var i = 0;
+    while (i < size) {
+      bh.consume(map.get(existingKeys(i), -1))
+      bh.consume(map.get(missingKeys(i), -1))
+      i += 1
+    }
+  }
+
+  @Benchmark def put(bh: Blackhole): Any = {
+    var map = new mutable.HashMap[Any, Any]
+
+    var i = 0;
+    while (i < size) {
+      map.put(existingKeys(i), i)
+      i += 1
+    }
+
+    map
+  }
+}