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  import java.io.Serializable;
34  
35  /**
36   * Benchmark for testing speed of object array reads/writes.
37   */
38  public class ObjArrays implements Benchmark {
39  
40      static class Node implements Serializable {
41          boolean z;
42          byte b;
43          char c;
44          short s;
45          int i;
46          float f;
47          long j;
48          double d;
49          String str = "bodega";
50          Object parent, left, right;
51  
52          Node(Object parent, int depth) {
53              this.parent = parent;
54              if (depth > 0) {
55                  left = new Node(this, depth - 1);
56                  right = new Node(this, depth - 1);
57              }
58          }
59      }
60  
61      /**
62       * Write and read object arrays to/from a stream.  The benchmark is run in
63       * batches, with each batch consisting of a fixed number of read/write
64       * cycles.  The ObjectOutputStream is reset after each batch of cycles has
65       * completed.
66       * Arguments: <array size> <# batches> <# cycles per batch>
67       */
68      public long run(String[] args) throws Exception {
69          int size = Integer.parseInt(args[0]);
70          int nbatches = Integer.parseInt(args[1]);
71          int ncycles = Integer.parseInt(args[2]);
72          Node[][] arrays = genArrays(size, ncycles);
73          StreamBuffer sbuf = new StreamBuffer();
74          ObjectOutputStream oout =
75              new ObjectOutputStream(sbuf.getOutputStream());
76          ObjectInputStream oin =
77              new ObjectInputStream(sbuf.getInputStream());
78  
79          doReps(oout, oin, sbuf, arrays, 1);     // warmup
80  
81          long start = System.currentTimeMillis();
82          doReps(oout, oin, sbuf, arrays, nbatches);
83          return System.currentTimeMillis() - start;
84      }
85  
86      /**
87       * Generate object arrays.
88       */
89      Node[][] genArrays(int size, int narrays) {
90          Node[][] arrays = new Node[narrays][size];
91          for (int i = 0; i < narrays; i++) {
92              for (int j = 0; j < size; j++) {
93                  arrays[i][j] = new Node(null, 0);
94              }
95          }
96          return arrays;
97      }
98  
99      /**
100      * Run benchmark for given number of batches, with given number of cycles
101      * for each batch.
102      */
103     void doReps(ObjectOutputStream oout, ObjectInputStream oin,
104                 StreamBuffer sbuf, Node[][] arrays, int nbatches)
105         throws Exception
106     {
107         int ncycles = arrays.length;
108         for (int i = 0; i < nbatches; i++) {
109             sbuf.reset();
110             oout.reset();
111             for (int j = 0; j < ncycles; j++) {
112                 oout.writeObject(arrays[j]);
113             }
114             oout.flush();
115             for (int j = 0; j < ncycles; j++) {
116                 oin.readObject();
117             }
118         }
119     }
120 }