127 lines
3.8 KiB
Java
127 lines
3.8 KiB
Java
/*
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* Copyright (c) 2014, 2020, 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.FileOutputStream;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.util.concurrent.TimeUnit;
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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.Fork;
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import org.openjdk.jmh.annotations.Level;
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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.Param;
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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.Warmup;
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import org.openjdk.jmh.annotations.TearDown;
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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 RandomAccessRead {
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@Param("1000000")
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private int fileSize;
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@Param("8192")
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private int buffer;
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private RandomAccessFile raf;
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private long offset;
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private int deltaIndex;
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private int[] deltas;
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private File f;
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private byte[] buf;
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@Setup(Level.Trial)
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public void beforeRun() throws IOException {
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f = File.createTempFile("RandomAccessBench", ".bin");
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try (FileOutputStream fos = new FileOutputStream(f)) {
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for (int i = 0; i < fileSize; i++) {
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fos.write((byte) i);
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}
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}
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deltas = new int[]{1, 2, 3, 5, 7, 11, 13, 17, 19, 23};
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buf = new byte[buffer];
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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 IOException {
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raf = new RandomAccessFile(f, "rw");
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offset = 0;
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deltaIndex = 0;
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}
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@TearDown(Level.Iteration)
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public void afterIteration() throws IOException {
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raf.close();
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}
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@Benchmark
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public int testBuffer() throws IOException {
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offset = offset + deltas[deltaIndex];
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if (offset >= fileSize) {
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offset = 0;
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}
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deltaIndex++;
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if (deltaIndex >= deltas.length) {
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deltaIndex = 0;
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}
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raf.seek(offset);
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return raf.read(buf);
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}
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@Benchmark
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public int test() throws IOException {
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offset = offset + deltas[deltaIndex];
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if (offset >= fileSize) {
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offset = 0;
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}
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deltaIndex++;
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if (deltaIndex >= deltas.length) {
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deltaIndex = 0;
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}
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raf.seek(offset);
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return raf.read();
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}
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}
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