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 ---------------------------------------------------------------------- .../distribution/NextGaussianPerformance.java | 70 ++++++++++++++++++++ 1 file changed, 70 insertions(+) ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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); + } +}
