From aefc8f4936e35b4f835fa2ec70d56443bbd7fa06 Mon Sep 17 00:00:00 2001
From: Rory Graves <rory.graves@fieldmark.co.uk>
Date: Sat, 4 Mar 2017 07:52:04 +0100
Subject: Add benchmarks for Map4 to HashMap and Set4 to HashSet transitions

---
 .../scala/collection/immutable/MapBenchmark.scala  | 29 ++++++++++++++++++++++
 .../scala/collection/immutable/SetBenchmark.scala  | 29 ++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 test/benchmarks/src/main/scala/scala/collection/immutable/MapBenchmark.scala
 create mode 100644 test/benchmarks/src/main/scala/scala/collection/immutable/SetBenchmark.scala

(limited to 'test')

diff --git a/test/benchmarks/src/main/scala/scala/collection/immutable/MapBenchmark.scala b/test/benchmarks/src/main/scala/scala/collection/immutable/MapBenchmark.scala
new file mode 100644
index 0000000000..a0358d6a1a
--- /dev/null
+++ b/test/benchmarks/src/main/scala/scala/collection/immutable/MapBenchmark.scala
@@ -0,0 +1,29 @@
+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 MapBenchmark {
+
+  var base: Map[String,String] = _
+
+
+  @Setup(Level.Trial) def initKeys(): Unit = {
+    base = Map("a" -> "a", "b" -> "b", "c" -> "c", "d" -> "d")
+  }
+
+  // immutable map is implemented as EmptyMap -> Map1 -> Map2 -> Map3 -> Map4 -> Hashmap
+  // add an extra entry to Map4 causes a lot of work, benchmark the transition
+  @Benchmark def map4AddElement(bh: Blackhole): Unit = {
+    bh.consume(base.updated("e", "e"))
+  }
+}
diff --git a/test/benchmarks/src/main/scala/scala/collection/immutable/SetBenchmark.scala b/test/benchmarks/src/main/scala/scala/collection/immutable/SetBenchmark.scala
new file mode 100644
index 0000000000..9330626691
--- /dev/null
+++ b/test/benchmarks/src/main/scala/scala/collection/immutable/SetBenchmark.scala
@@ -0,0 +1,29 @@
+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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