| /* |
| * 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.examples.jmh.sampling.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.OutputTimeUnit; |
| 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.NANOSECONDS) |
| @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 { |
| /** JDK's generator. */ |
| private final Random random = new Random(); |
| |
| /** |
| * The value. |
| * |
| * <p>This must NOT be final!</p> |
| */ |
| private double value; |
| |
| /** |
| * Baseline for the JMH timing overhead for production of an {@code double} value. |
| * |
| * @return the {@code double} value |
| */ |
| @Benchmark |
| public double baseline() { |
| return value; |
| } |
| |
| /** |
| * Run JDK random gaussian sampler. |
| * |
| * @return the double |
| */ |
| @Benchmark |
| public double runJDKRandomGaussianSampler() { |
| return random.nextGaussian(); |
| } |
| } |