diff a/test/micro/org/openjdk/bench/valhalla/corelibs/mapprotos/MapBase.java b/test/micro/org/openjdk/bench/valhalla/corelibs/mapprotos/MapBase.java
--- /dev/null
+++ b/test/micro/org/openjdk/bench/valhalla/corelibs/mapprotos/MapBase.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.openjdk.bench.valhalla.corelibs.mapprotos;
+
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Warmup;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Random;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.IntStream;
+
+@Fork(1)
+@Warmup(iterations = 3, time = 1)
+@Measurement(iterations = 5, time = 1)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@BenchmarkMode(Mode.AverageTime)
+@State(Scope.Thread)
+public class MapBase {
+
+    @Param({"500", "1000000"})
+    public int size;
+
+    @Param({"42"})
+    public int seed;
+
+    public Random rnd;
+    public Integer[] keys;
+    public Integer[] nonKeys;
+
+    public void init(int size) {
+        Integer[] all;
+        if (seed != 0) {
+            rnd = new Random(seed);
+            all = rnd.ints().distinct().limit(size * 2).boxed().toArray(Integer[]::new);
+            Collections.shuffle(Arrays.asList(all), rnd);
+        } else {
+            rnd = new Random();
+            all = IntStream.range(0, size * 2).boxed().toArray(Integer[]::new);
+            Collections.shuffle(Arrays.asList(all));
+        }
+        keys = Arrays.copyOfRange(all, 0, size);
+        nonKeys = Arrays.copyOfRange(all, size, size * 2);
+
+    }
+}