130 lines
3.8 KiB
Java
130 lines
3.8 KiB
Java
/*
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* Copyright (c) 2022, 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 micro.org.openjdk.bench.java.io;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Blackhole;
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import java.io.*;
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import java.nio.file.Files;
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import java.util.Random;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.concurrent.TimeUnit;
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@Fork(2)
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@State(Scope.Thread)
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@Warmup(iterations = 5, time = 1)
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@Measurement(iterations = 5, time = 2)
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public class RandomAccessFileBenchmark {
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@Param({"1", "5"})
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private int kiloBytes;
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private int size;
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private File file;
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private RandomAccessFile raf;
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private short[] shorts;
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private int[] ints;
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private long[] longs;
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@Setup(Level.Iteration)
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public void beforeRun() throws IOException {
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Random rnd = ThreadLocalRandom.current();
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size = kiloBytes << 10;
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var bytes = new byte[size];
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rnd.nextBytes(bytes);
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file = File.createTempFile(getClass().getName(), ".txt");
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Files.write(file.toPath(), bytes);
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shorts = new short[size];
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for (int i = 0; i < size / Short.BYTES; i++) {
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shorts[i] = (short) rnd.nextInt();
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}
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ints = rnd.ints(size / Integer.BYTES).toArray();
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longs = rnd.longs(size / Long.BYTES).toArray();
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raf = new RandomAccessFile(file, "rw");
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// Make it more likely file content is directly available
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for (int i = 0; i < size / Integer.BYTES; i++) {
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raf.readInt();
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}
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}
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@TearDown(Level.Iteration)
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public void afterRun() throws IOException {
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raf.close();
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file.delete();
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}
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@Benchmark
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public void readShort(Blackhole bh) throws IOException {
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raf.seek(0);
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for (int i = 0; i < size / Short.BYTES; i++) {
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bh.consume(raf.readShort());
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}
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}
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@Benchmark
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public void readInt(Blackhole bh) throws IOException {
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raf.seek(0);
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for (int i = 0; i < size / Integer.BYTES; i++) {
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bh.consume(raf.readInt());
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}
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}
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@Benchmark
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public void readLong(Blackhole bh) throws IOException {
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raf.seek(0);
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for (int i = 0; i < size / Long.BYTES; i++) {
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bh.consume(raf.readLong());
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}
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}
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@Benchmark
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public void writeShort() throws IOException {
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raf.seek(0);
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for (int i = 0; i < size / Short.BYTES; i++) {
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raf.writeShort(shorts[i]);
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}
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}
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@Benchmark
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public void writeInt() throws IOException {
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raf.seek(0);
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for (int i = 0; i < size / Integer.BYTES; i++) {
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raf.writeInt(ints[i]);
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}
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}
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@Benchmark
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public void writeLong() throws IOException {
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raf.seek(0);
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for (int i = 0; i < size / Long.BYTES; i++) {
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raf.writeLong(longs[i]);
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}
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}
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}
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