1   /*
2    * Copyright (c) 1999, 2008, 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  
24  /*
25   *
26   */
27  
28  package bench.serial;
29  
30  import bench.Benchmark;
31  import java.io.ObjectInputStream;
32  import java.io.ObjectOutputStream;
33  
34  /**
35   * Benchmark for testing speed of byte array reads/writes.
36   */
37  public class ByteArrays implements Benchmark {
38  
39      /**
40       * Write and read byte arrays to/from a stream.  The benchmark is run in
41       * batches, with each batch consisting of a fixed number of read/write
42       * cycles.  The ObjectOutputStream is reset after each batch of cycles has
43       * completed.
44       * Arguments: <array size> <# batches> <# cycles per batch>
45       */
46      public long run(String[] args) throws Exception {
47          int size = Integer.parseInt(args[0]);
48          int nbatches = Integer.parseInt(args[1]);
49          int ncycles = Integer.parseInt(args[2]);
50          byte[][] arrays = new byte[ncycles][size];
51          StreamBuffer sbuf = new StreamBuffer();
52          ObjectOutputStream oout =
53              new ObjectOutputStream(sbuf.getOutputStream());
54          ObjectInputStream oin =
55              new ObjectInputStream(sbuf.getInputStream());
56  
57          doReps(oout, oin, sbuf, arrays, 1);     // warmup
58  
59          long start = System.currentTimeMillis();
60          doReps(oout, oin, sbuf, arrays, nbatches);
61          return System.currentTimeMillis() - start;
62      }
63  
64      /**
65       * Run benchmark for given number of batches, with given number of cycles
66       * for each batch.
67       */
68      void doReps(ObjectOutputStream oout, ObjectInputStream oin,
69                  StreamBuffer sbuf, byte[][] arrays, int nbatches)
70          throws Exception
71      {
72          int ncycles = arrays.length;
73          for (int i = 0; i < nbatches; i++) {
74              sbuf.reset();
75              oout.reset();
76              for (int j = 0; j < ncycles; j++) {
77                  oout.writeObject(arrays[j]);
78              }
79              oout.flush();
80              for (int j = 0; j < ncycles; j++) {
81                  oin.readObject();
82              }
83          }
84      }
85  }