test/micro/org/openjdk/bench/java/io/FileRead.java
changeset 52595 16609197022c
equal deleted inserted replaced
52594:4d8a023c2a03 52595:16609197022c
       
     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 }