RepeatObjs.java revision 169:fa4df2d26d9b
1/* 2 * Copyright 1999 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 */ 23 24/* 25 * 26 */ 27 28package bench.serial; 29 30import bench.Benchmark; 31import java.io.ObjectInputStream; 32import java.io.ObjectOutputStream; 33import java.io.Serializable; 34 35/** 36 * Benchmark for testing speed of reads/writes of repeated objects. 37 */ 38public class RepeatObjs implements Benchmark { 39 40 static class Node implements Serializable { 41 } 42 43 /** 44 * Write and read repeated objects to/from a stream. The benchmark is run 45 * for a given number of batches. Within each batch, a set of objects 46 * is written to and read from the stream. The set of objects remains the 47 * same between batches (and the serialization streams are not reset) in 48 * order to test the speed of object -> wire handle lookup, and vice versa. 49 * Arguments: <# objects> <# cycles> 50 */ 51 public long run(String[] args) throws Exception { 52 int size = Integer.parseInt(args[0]); 53 int nbatches = Integer.parseInt(args[1]); 54 Node[] objs = genObjs(size); 55 StreamBuffer sbuf = new StreamBuffer(); 56 ObjectOutputStream oout = 57 new ObjectOutputStream(sbuf.getOutputStream()); 58 ObjectInputStream oin = 59 new ObjectInputStream(sbuf.getInputStream()); 60 61 doReps(oout, oin, sbuf, objs, 1); // warmup 62 63 long start = System.currentTimeMillis(); 64 doReps(oout, oin, sbuf, objs, nbatches); 65 return System.currentTimeMillis() - start; 66 } 67 68 /** 69 * Generate objects. 70 */ 71 Node[] genObjs(int nobjs) { 72 Node[] objs = new Node[nobjs]; 73 for (int i = 0; i < nobjs; i++) 74 objs[i] = new Node(); 75 return objs; 76 } 77 78 /** 79 * Run benchmark for given number of batches. 80 */ 81 void doReps(ObjectOutputStream oout, ObjectInputStream oin, 82 StreamBuffer sbuf, Node[] objs, int nbatches) 83 throws Exception 84 { 85 int nobjs = objs.length; 86 for (int i = 0; i < nbatches; i++) { 87 sbuf.reset(); 88 for (int j = 0; j < nobjs; j++) { 89 oout.writeObject(objs[j]); 90 } 91 oout.flush(); 92 for (int j = 0; j < nobjs; j++) { 93 oin.readObject(); 94 } 95 } 96 } 97} 98