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.FileInputStream;

    27 import java.io.FileNotFoundException;

    28 import java.io.FileOutputStream;

    29 import java.io.IOException;

    30 import java.util.concurrent.TimeUnit;

    31 

    32 import org.openjdk.jmh.annotations.*;

    33 

    34 /**

    35  * Tests the overheads of I/O API.

    36  * This test is known to depend heavily on disk subsystem performance.

    37  */

    38 @BenchmarkMode(Mode.Throughput)

    39 @OutputTimeUnit(TimeUnit.MILLISECONDS)

    40 @State(Scope.Thread)

    41 public class FileRead {

    42 

    43     @Param("1000000")

    44     private int fileSize;

    45 

    46     private File f;

    47     private FileInputStream fis;

    48 

    49     @Setup(Level.Trial)

    50     public void beforeRun() throws IOException {

    51         f = File.createTempFile("FileReadBench", ".bin");

    52         try (FileOutputStream fos = new FileOutputStream(f)) {

    53             for (int i = 0; i < fileSize; i++) {

    54                 fos.write((byte) i);

    55             }

    56         }

    57     }

    58 

    59     @TearDown(Level.Trial)

    60     public void afterRun() throws IOException {

    61         f.delete();

    62     }

    63 

    64     @Setup(Level.Iteration)

    65     public void beforeIteration() throws FileNotFoundException {

    66         fis = new FileInputStream(f);

    67     }

    68 

    69     @TearDown(Level.Iteration)

    70     public void afterIteration() throws IOException {

    71         fis.close();

    72     }

    73 

    74     @Benchmark

    75     public void test() throws IOException {

    76         int ret = fis.read();

    77         if (ret == -1) {

    78             // start over

    79             fis.close();

    80             fis = new FileInputStream(f);

    81         }

    82     }

    83 

    84 }