Floats.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; 33 34/** 35 * Benchmark for testing speed of float reads/writes. 36 */ 37public class Floats implements Benchmark { 38 39 /** 40 * Write and read float values to/from a stream. The benchmark is run in 41 * batches: each "batch" consists of a fixed number of read/write cycles, 42 * and the stream is flushed (and underlying stream buffer cleared) in 43 * between each batch. 44 * Arguments: <# batches> <# cycles per batch> 45 */ 46 public long run(String[] args) throws Exception { 47 int nbatches = Integer.parseInt(args[0]); 48 int ncycles = Integer.parseInt(args[1]); 49 StreamBuffer sbuf = new StreamBuffer(); 50 ObjectOutputStream oout = 51 new ObjectOutputStream(sbuf.getOutputStream()); 52 ObjectInputStream oin = 53 new ObjectInputStream(sbuf.getInputStream()); 54 55 doReps(oout, oin, sbuf, 1, ncycles); // warmup 56 57 long start = System.currentTimeMillis(); 58 doReps(oout, oin, sbuf, nbatches, ncycles); 59 return System.currentTimeMillis() - start; 60 } 61 62 /** 63 * Run benchmark for given number of batches, with given number of cycles 64 * for each batch. 65 */ 66 void doReps(ObjectOutputStream oout, ObjectInputStream oin, 67 StreamBuffer sbuf, int nbatches, int ncycles) 68 throws Exception 69 { 70 for (int i = 0; i < nbatches; i++) { 71 sbuf.reset(); 72 for (int j = 0; j < ncycles; j++) { 73 oout.writeFloat((float) 0.0); 74 } 75 oout.flush(); 76 for (int j = 0; j < ncycles; j++) { 77 oin.readFloat(); 78 } 79 } 80 } 81} 82