1 /* 2 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.openjdk.bench.java.io; 24 25 import java.io.File; 26 import java.io.FileNotFoundException; 27 import java.io.FileOutputStream; 28 import java.io.IOException; 29 import java.util.concurrent.TimeUnit; 30 31 import org.openjdk.jmh.annotations.*; 32 33 /** 34 * Tests the overheads of I/O API. 35 * This test is known to depend heavily on disk subsystem performance. 36 */ 37 @BenchmarkMode(Mode.Throughput) 38 @OutputTimeUnit(TimeUnit.MILLISECONDS) 39 @State(Scope.Thread) 40 public class FileWrite { 41 42 @Param("1000000") 43 private int fileSize; 44 45 private File f; 46 private FileOutputStream fos; 47 private long count; 48 49 @Setup(Level.Trial) 50 public void beforeRun() throws IOException { 51 f = File.createTempFile("FileWriteBench", ".bin"); 52 } 53 54 @TearDown(Level.Trial) 55 public void afterRun() throws IOException { 56 f.delete(); 57 } 58 59 @Setup(Level.Iteration) 60 public void beforeIteration() throws FileNotFoundException { 61 fos = new FileOutputStream(f); 62 } 63 64 @TearDown(Level.Iteration) 65 public void afterIteration() throws IOException { 66 fos.close(); 67 } 68 69 @Benchmark 70 public void test() throws IOException { 71 fos.write((byte) count); 72 count++; 73 if (count >= fileSize) { 74 // restart 75 fos.close(); 76 fos = new FileOutputStream(f); 77 count = 0; 78 } 79 } 80 81 }