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1 /* |
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2 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package org.openjdk.bench.java.io; |
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24 |
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25 import java.io.File; |
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26 import java.io.FileInputStream; |
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27 import java.io.FileNotFoundException; |
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28 import java.io.FileOutputStream; |
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29 import java.io.IOException; |
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30 import java.util.concurrent.TimeUnit; |
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31 |
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32 import org.openjdk.jmh.annotations.*; |
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33 |
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34 /** |
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35 * Tests the overheads of I/O API. |
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36 * This test is known to depend heavily on disk subsystem performance. |
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37 */ |
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38 @BenchmarkMode(Mode.Throughput) |
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39 @OutputTimeUnit(TimeUnit.MILLISECONDS) |
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40 @State(Scope.Thread) |
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41 public class FileRead { |
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42 |
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43 @Param("1000000") |
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44 private int fileSize; |
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45 |
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46 private File f; |
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47 private FileInputStream fis; |
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48 |
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49 @Setup(Level.Trial) |
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50 public void beforeRun() throws IOException { |
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51 f = File.createTempFile("FileReadBench", ".bin"); |
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52 try (FileOutputStream fos = new FileOutputStream(f)) { |
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53 for (int i = 0; i < fileSize; i++) { |
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54 fos.write((byte) i); |
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55 } |
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56 } |
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57 } |
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58 |
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59 @TearDown(Level.Trial) |
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60 public void afterRun() throws IOException { |
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61 f.delete(); |
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62 } |
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63 |
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64 @Setup(Level.Iteration) |
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65 public void beforeIteration() throws FileNotFoundException { |
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66 fis = new FileInputStream(f); |
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67 } |
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68 |
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69 @TearDown(Level.Iteration) |
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70 public void afterIteration() throws IOException { |
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71 fis.close(); |
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72 } |
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73 |
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74 @Benchmark |
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75 public void test() throws IOException { |
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76 int ret = fis.read(); |
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77 if (ret == -1) { |
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78 // start over |
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79 fis.close(); |
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80 fis = new FileInputStream(f); |
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81 } |
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82 } |
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83 |
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84 } |