| /* |
| * Copyright (C) 2019, Matthias Sohn <matthias.sohn@sap.com> and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| package org.eclipse.jgit.benchmarks; |
| |
| import java.security.SecureRandom; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.eclipse.jgit.util.SimpleLruCache; |
| import org.openjdk.jmh.annotations.Benchmark; |
| import org.openjdk.jmh.annotations.BenchmarkMode; |
| import org.openjdk.jmh.annotations.Group; |
| import org.openjdk.jmh.annotations.GroupThreads; |
| import org.openjdk.jmh.annotations.Mode; |
| import org.openjdk.jmh.annotations.OutputTimeUnit; |
| import org.openjdk.jmh.annotations.Scope; |
| import org.openjdk.jmh.annotations.Setup; |
| import org.openjdk.jmh.annotations.State; |
| import org.openjdk.jmh.annotations.TearDown; |
| import org.openjdk.jmh.runner.Runner; |
| import org.openjdk.jmh.runner.RunnerException; |
| import org.openjdk.jmh.runner.options.Options; |
| import org.openjdk.jmh.runner.options.OptionsBuilder; |
| |
| @State(Scope.Benchmark) |
| public class SimpleLruCacheBenchmark { |
| |
| SecureRandom rnd = new SecureRandom(); |
| |
| private volatile SimpleLruCache<String, String> cache = new SimpleLruCache<>( |
| 100, 0.2f); |
| |
| private volatile int i; |
| |
| @Setup |
| public void setupBenchmark() { |
| i = rnd.nextInt(250); |
| } |
| |
| @TearDown |
| public void teardown() { |
| cache = null; |
| } |
| |
| @Benchmark |
| @Group("readwrite") |
| @GroupThreads(1) |
| @BenchmarkMode({ Mode.AverageTime }) |
| @OutputTimeUnit(TimeUnit.NANOSECONDS) |
| public SimpleLruCache<String, String> testCacheWrite() { |
| cache.put("k" + i, "v" + i); |
| return cache; |
| } |
| |
| @Benchmark |
| @Group("readwrite") |
| @GroupThreads(1) |
| @BenchmarkMode({ Mode.AverageTime }) |
| @OutputTimeUnit(TimeUnit.NANOSECONDS) |
| public SimpleLruCache<String, String> testCacheRead() { |
| cache.get("k" + i); |
| return cache; |
| } |
| |
| public static void main(String[] args) throws RunnerException { |
| Options opt = new OptionsBuilder() |
| .include(SimpleLruCacheBenchmark.class.getSimpleName()) |
| // .addProfiler(StackProfiler.class) |
| // .addProfiler(GCProfiler.class) |
| .forks(1).jvmArgs("-ea").build(); |
| new Runner(opt).run(); |
| } |
| } |