Add benchmark for strategies how to move a file
We can either - try moving the file and, in case the target directory doesn't exist, handle the NoSuchFileException this raises to create the target directory - or we always first test if the target directory exists and create it in case it is missing On my Mac this yields Benchmark Mode Cnt Score Error Units FileMoveBenchmark.moveFileToExistingDir avgt 5 196.490 ± 15.194 us/op FileMoveBenchmark.moveFileToExistingDirExists avgt 5 223.217 ± 54.816 us/op FileMoveBenchmark.moveFileToMissingDir avgt 5 332.169 ± 43.871 us/op FileMoveBenchmark.moveFileToMissingDirExists avgt 5 303.815 ± 137.568 us/op This means if the target directory of the move already exists the first strategy is faster by around 25 us/op otherwise the second one is faster by around 30 us/op. Which one is favorable depends on the average probability that the target directory exists in real world scenarios. Change-Id: I03653b408b859a796508dfa1471b36c65633534e Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
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/*
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* Copyright (C) 2020, Matthias Sohn <matthias.sohn@sap.com> and others
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*
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* This program and the accompanying materials are made available under the
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* terms of the Eclipse Distribution License v. 1.0 which is available at
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* https://www.eclipse.org/org/documents/edl-v10.php.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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package org.eclipse.jgit.benchmarks;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.NoSuchFileException;
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import java.nio.file.Path;
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import java.nio.file.StandardCopyOption;
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import java.util.concurrent.TimeUnit;
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import org.eclipse.jgit.util.FileUtils;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.TearDown;
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import org.openjdk.jmh.annotations.Warmup;
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import org.openjdk.jmh.runner.Runner;
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import org.openjdk.jmh.runner.RunnerException;
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import org.openjdk.jmh.runner.options.Options;
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import org.openjdk.jmh.runner.options.OptionsBuilder;
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@State(Scope.Thread)
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public class FileMoveBenchmark {
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int i;
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Path testDir;
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Path targetDir;
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@Setup
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public void setupBenchmark() throws IOException {
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testDir = Files.createTempDirectory("dir");
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targetDir = testDir.resolve("target");
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Files.createDirectory(targetDir);
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}
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@TearDown
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public void teardown() throws IOException {
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FileUtils.delete(testDir.toFile(),
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FileUtils.RECURSIVE | FileUtils.RETRY);
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}
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@Benchmark
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@BenchmarkMode({ Mode.AverageTime })
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@Warmup(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 5, time = 5000, timeUnit = TimeUnit.MILLISECONDS)
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public Path moveFileToExistingDir() throws IOException {
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i++;
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Path tmp = testDir.resolve("tmp" + i++);
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Files.createFile(tmp);
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Path targetDirectory = targetDir;
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Path targetFile = targetDirectory.resolve("tmp" + i);
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try {
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return Files.move(tmp, targetFile, StandardCopyOption.ATOMIC_MOVE);
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} catch (NoSuchFileException e) {
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Files.createDirectory(targetDirectory);
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return Files.move(tmp, targetFile, StandardCopyOption.ATOMIC_MOVE);
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}
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}
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@Benchmark
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@BenchmarkMode({ Mode.AverageTime })
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@Warmup(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 5, time = 5000, timeUnit = TimeUnit.MILLISECONDS)
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public Path moveFileToExistingDirExists() throws IOException {
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Path tmp = testDir.resolve("tmp" + i++);
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Files.createFile(tmp);
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Path targetDirectory = targetDir;
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Path targetFile = targetDir.resolve("tmp" + i);
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if (!targetDirectory.toFile().exists()) {
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Files.createDirectory(targetDirectory);
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}
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return Files.move(tmp, targetFile, StandardCopyOption.ATOMIC_MOVE);
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}
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@Benchmark
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@BenchmarkMode({ Mode.AverageTime })
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@Warmup(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 5, time = 5000, timeUnit = TimeUnit.MILLISECONDS)
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public Path moveFileToMissingDir() throws IOException {
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i++;
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Path tmp = testDir.resolve("tmp" + i);
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Files.createFile(tmp);
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Path targetDirectory = testDir.resolve("target" + i);
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Path targetFile = targetDirectory.resolve("tmp" + i);
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try {
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return Files.move(tmp, targetFile, StandardCopyOption.ATOMIC_MOVE);
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} catch (NoSuchFileException e) {
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Files.createDirectory(targetDirectory);
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return Files.move(tmp, targetFile, StandardCopyOption.ATOMIC_MOVE);
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}
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}
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@Benchmark
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@BenchmarkMode({ Mode.AverageTime })
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@Warmup(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 5, time = 5000, timeUnit = TimeUnit.MILLISECONDS)
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public Path moveFileToMissingDirExists() throws IOException {
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i++;
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Path tmp = testDir.resolve("tmp" + i);
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Files.createFile(tmp);
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Path targetDirectory = testDir.resolve("target" + i);
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Path targetFile = targetDirectory.resolve("tmp" + i);
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if (!targetDirectory.toFile().exists()) {
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Files.createDirectory(targetDirectory);
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}
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return Files.move(tmp, targetFile, StandardCopyOption.ATOMIC_MOVE);
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}
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public static void main(String[] args) throws RunnerException {
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Options opt = new OptionsBuilder()
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.include(FileMoveBenchmark.class
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.getSimpleName())
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// .addProfiler(StackProfiler.class)
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// .addProfiler(GCProfiler.class)
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.forks(1).jvmArgs("-ea").build();
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new Runner(opt).run();
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}
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}
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