Obsolete class.
Benchmarking is performed in "Commons RNG".
This commit is contained in:
Gilles Sadowski
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.math4.userguide.rng;
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import java.util.List;
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import java.util.ArrayList;
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import java.util.Random;
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import org.apache.commons.rng.simple.RandomSource;
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import org.apache.commons.rng.UniformRandomProvider;
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import org.apache.commons.math4.random.RandomGenerator;
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import org.apache.commons.math4.PerfTestUtils;
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/**
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* Benchmark of the RNGs.
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*/
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public class RandomNumberGeneratorBenchmark {
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/** Number of loops over the operations to be benchmarked. */
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private static final int NUM_CALLS = 1_000_000;
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/** Number of runs for computing the statistics. */
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private static final int NUM_STATS = 500;
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/** Report formatting. */
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private static final int MAX_NAME_WIDTH = 45;
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/**
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* Program's entry point.
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*
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* @param args List of {@link RandomSource RNG indentifiers}.
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*/
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public static void main(String[] args) throws Exception {
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final RandomNumberGeneratorBenchmark app = new RandomNumberGeneratorBenchmark();
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printEnv();
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final List<UniformRandomProvider> rngList = new ArrayList<>();
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for (int i = 0; i < args.length; i++) {
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rngList.add(RandomSource.create(RandomSource.valueOf(args[i])));
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}
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app.benchmark(rngList);
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}
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/**
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* Test all generators.
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* The reference is JDK's "Random".
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*
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* @param list List of generators to benchmark.
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*/
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public void benchmark(List<UniformRandomProvider> rngList) {
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// Reference is JDK's "Random".
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final Random jdk = new Random();
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// List of benchmarked codes.
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final PerfTestUtils.RunTest[] candidates = new PerfTestUtils.RunTest[rngList.size() + 1];
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// "nextInt()" benchmark.
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candidates[0] = new PerfTestUtils.RunTest(jdk.toString()) {
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@Override
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public Double call() throws Exception {
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return (double) jdk.nextInt();
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}
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};
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for (int i = 0; i < rngList.size(); i++) {
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final UniformRandomProvider rng = rngList.get(i);
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candidates[i + 1] = new PerfTestUtils.RunTest(rng.toString()) {
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@Override
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public Double call() throws Exception {
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return (double) rng.nextInt();
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}
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};
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}
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PerfTestUtils.timeAndReport("nextInt()",
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MAX_NAME_WIDTH,
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NUM_CALLS,
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NUM_STATS,
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false,
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candidates);
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// "nextDouble()" benchmark.
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candidates[0] = new PerfTestUtils.RunTest(jdk.toString()) {
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@Override
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public Double call() throws Exception {
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return (double) jdk.nextDouble();
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}
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};
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for (int i = 0; i < rngList.size(); i++) {
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final UniformRandomProvider rng = rngList.get(i);
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candidates[i + 1] = new PerfTestUtils.RunTest(rng.toString()) {
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@Override
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public Double call() throws Exception {
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return rng.nextDouble();
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}
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};
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}
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PerfTestUtils.timeAndReport("nextDouble()",
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MAX_NAME_WIDTH,
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NUM_CALLS,
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NUM_STATS,
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false,
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candidates);
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// "nextLong()" benchmark.
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candidates[0] = new PerfTestUtils.RunTest(jdk.toString()) {
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@Override
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public Double call() throws Exception {
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return (double) jdk.nextLong();
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}
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};
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for (int i = 0; i < rngList.size(); i++) {
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final UniformRandomProvider rng = rngList.get(i);
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candidates[i + 1] = new PerfTestUtils.RunTest(rng.toString()) {
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@Override
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public Double call() throws Exception {
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return (double) rng.nextLong();
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}
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};
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}
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PerfTestUtils.timeAndReport("nextLong()",
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MAX_NAME_WIDTH,
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NUM_CALLS,
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NUM_STATS,
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false,
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candidates);
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}
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/**
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* Print environment.
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*/
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private static void printEnv() {
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final String sep = " ";
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System.out.println("Java" + sep + System.getProperty("java.version"));
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System.out.println("Runtime" + sep + System.getProperty("java.runtime.version", "?"));
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System.out.println("JVM" + sep + System.getProperty("java.vm.name") +
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sep + System.getProperty("java.vm.version"));
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}
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}
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