[3/3] commons-rng git commit: Benchmark for "nextGaussian()" method of "java.util.Random".

[er...@apache.org]

Benchmark for "nextGaussian()" method of "java.util.Random".


Project: http://git-wip-us.apache.org/repos/asf/commons-rng/repo
Commit: http://git-wip-us.apache.org/repos/asf/commons-rng/commit/44ce45b3
Tree: http://git-wip-us.apache.org/repos/asf/commons-rng/tree/44ce45b3
Diff: http://git-wip-us.apache.org/repos/asf/commons-rng/diff/44ce45b3

Branch: refs/heads/master
Commit: 44ce45b3186951b5edd74c089a1272043611ce4f
Parents: 1434592
Author: Gilles <er...@apache.org>
Authored: Sat Apr 1 17:28:58 2017 +0200
Committer: Gilles <er...@apache.org>
Committed: Sat Apr 1 17:28:58 2017 +0200

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 .../distribution/NextGaussianPerformance.java   | 70 ++++++++++++++++++++
 1 file changed, 70 insertions(+)
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http://git-wip-us.apache.org/repos/asf/commons-rng/blob/44ce45b3/commons-rng-jmh/src/main/java/org/apache/commons/rng/jmh/distribution/NextGaussianPerformance.java
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diff --git a/commons-rng-jmh/src/main/java/org/apache/commons/rng/jmh/distribution/NextGaussianPerformance.java b/commons-rng-jmh/src/main/java/org/apache/commons/rng/jmh/distribution/NextGaussianPerformance.java
new file mode 100644
index 0000000..d00de19
--- /dev/null
+++ b/commons-rng-jmh/src/main/java/org/apache/commons/rng/jmh/distribution/NextGaussianPerformance.java
@@ -0,0 +1,70 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.rng.jmh.distribution;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.infra.Blackhole;
+import java.util.concurrent.TimeUnit;
+import java.util.Random;
+
+/**
+ * Benchmark for {@link Random#nextGaussian()} in order to compare
+ * the speed of generation of normally-distributed random numbers.
+ */
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@State(Scope.Benchmark)
+@Fork(value = 1, jvmArgs = {"-server", "-Xms128M", "-Xmx128M"})
+public class NextGaussianPerformance {
+    /** Number of samples per run. */
+    private final int NUM_SAMPLES = 10000000;
+    /** JDK's generator. */
+    private final Random random = new Random();
+    /**
+     * Exercises the JDK's Gaussian sampler.
+     *
+     * @param bh Data sink.
+     */
+    private void runSample(Blackhole bh) {
+        for (int i = 0; i < NUM_SAMPLES; i++) {
+            bh.consume(random.nextGaussian());
+        }
+    }
+
+    // Benchmarks methods below.
+
+    /**
+     * @param bh Data sink.
+     */
+    @Benchmark
+    public void runJDKRandomGaussianSampler(Blackhole bh) {
+        runSample(bh);
+    }
+}