author | xdono |
Wed, 02 Jul 2008 12:55:45 -0700 | |
changeset 715 | f16baef3a20e |
parent 309 | bda219d843f6 |
child 5506 | 202f599c92aa |
permissions | -rw-r--r-- |
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/* |
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* Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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/* |
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* |
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*/ |
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package bench.serial; |
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import bench.Benchmark; |
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import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
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import java.io.Serializable; |
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/** |
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* Benchmark for testing speed of writes and reads of a tree of small objects. |
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*/ |
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public class SmallObjTrees implements Benchmark { |
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static class Node implements Serializable { |
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Object parent, left, right; |
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Node(Object parent, int depth) { |
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this.parent = parent; |
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if (depth > 0) { |
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left = new Node(this, depth - 1); |
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right = new Node(this, depth - 1); |
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} |
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} |
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} |
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/** |
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* Write and read a tree of small objects from a stream. The benchmark is |
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* run in batches: each "batch" consists of a fixed number of read/write |
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* cycles, and the stream is flushed (and underlying stream buffer cleared) |
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* in between each batch. |
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* Arguments: <tree depth> <# batches> <# cycles per batch> |
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*/ |
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public long run(String[] args) throws Exception { |
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int depth = Integer.parseInt(args[0]); |
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int nbatches = Integer.parseInt(args[1]); |
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int ncycles = Integer.parseInt(args[2]); |
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Node[] trees = genTrees(depth, ncycles); |
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StreamBuffer sbuf = new StreamBuffer(); |
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ObjectOutputStream oout = |
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new ObjectOutputStream(sbuf.getOutputStream()); |
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ObjectInputStream oin = |
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new ObjectInputStream(sbuf.getInputStream()); |
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doReps(oout, oin, sbuf, trees, 1); // warmup |
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long start = System.currentTimeMillis(); |
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doReps(oout, oin, sbuf, trees, nbatches); |
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return System.currentTimeMillis() - start; |
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} |
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/** |
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* Generate object trees. |
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*/ |
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Node[] genTrees(int depth, int ntrees) { |
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Node[] trees = new Node[ntrees]; |
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for (int i = 0; i < ntrees; i++) { |
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trees[i] = new Node(null, depth); |
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} |
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return trees; |
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} |
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/** |
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* Run benchmark for given number of batches, with each batch containing the |
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* given number of cycles. |
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*/ |
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void doReps(ObjectOutputStream oout, ObjectInputStream oin, |
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StreamBuffer sbuf, Node[] trees, int nbatches) |
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throws Exception |
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{ |
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int ncycles = trees.length; |
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for (int i = 0; i < nbatches; i++) { |
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sbuf.reset(); |
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oout.reset(); |
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for (int j = 0; j < ncycles; j++) { |
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oout.writeObject(trees[j]); |
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} |
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oout.flush(); |
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for (int j = 0; j < ncycles; j++) { |
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oin.readObject(); |
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} |
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} |
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} |
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} |