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111 lines
3.4 KiB
Java
111 lines
3.4 KiB
Java
/*
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* Copyright (c) 2014, 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.java.io;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.RandomAccessFile;
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import java.io.IOException;
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import java.util.concurrent.TimeUnit;
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import org.openjdk.jmh.annotations.*;
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/**
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* Tests the overheads of I/O API.
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* This test is known to depend heavily on disk subsystem performance.
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*/
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@BenchmarkMode(Mode.Throughput)
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@OutputTimeUnit(TimeUnit.MILLISECONDS)
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@Fork(2)
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@Warmup(iterations = 4, time = 2, timeUnit = TimeUnit.SECONDS)
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@Measurement(iterations = 4, time = 2, timeUnit = TimeUnit.SECONDS)
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@State(Scope.Thread)
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public class FileWrite {
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@Param("1000000")
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private int fileSize;
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private File f;
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private FileOutputStream fos;
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private long count;
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@Setup(Level.Trial)
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public void beforeRun() throws IOException {
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f = File.createTempFile("FileWriteBench", ".bin");
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}
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@TearDown(Level.Trial)
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public void afterRun() throws IOException {
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f.delete();
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}
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@Setup(Level.Iteration)
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public void beforeIteration() throws FileNotFoundException {
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fos = new FileOutputStream(f);
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}
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@TearDown(Level.Iteration)
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public void afterIteration() throws IOException {
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fos.close();
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}
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@Benchmark
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public void test() throws IOException {
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fos.write((byte) count);
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count++;
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if (count >= fileSize) {
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// restart
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fos.close();
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fos = new FileOutputStream(f);
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count = 0;
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}
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}
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@State(Scope.Benchmark)
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@Warmup(iterations = 3, time = 2)
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@Measurement(iterations = 5, time = 5)
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@BenchmarkMode(Mode.SampleTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@Threads(1)
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@Fork(value = 10)
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public static class OpenFileForWritingBench {
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final byte[] payload = "something".getBytes();
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final String path = System.getProperty("os.name", "unknown").toLowerCase().contains("win") ? "NUL" : "/dev/null";
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@Benchmark
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public void testFileOutputStream() throws IOException {
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try (FileOutputStream f = new FileOutputStream(path)) {
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f.write(payload);
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}
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}
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@Benchmark
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public void testRandomAccessFile() throws IOException {
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try (RandomAccessFile f = new RandomAccessFile(path, "rw")) {
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f.write(payload);
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}
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}
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}
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}
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