author | ohair |
Tue, 25 May 2010 15:58:33 -0700 | |
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/* |
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* Copyright (c) 1999, 2008, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* 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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import java.lang.reflect.Constructor; |
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import java.lang.reflect.InvocationHandler; |
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import java.lang.reflect.Method; |
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import java.lang.reflect.Proxy; |
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/** |
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* Benchmark for testing speed of proxy array reads/writes. |
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*/ |
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public class ProxyArrays implements Benchmark { |
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static class DummyHandler implements InvocationHandler, Serializable { |
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public Object invoke(Object proxy, Method method, Object[] args) |
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throws Throwable |
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{ |
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return null; |
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} |
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} |
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static interface DummyInterface { |
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public void foo(); |
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} |
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/** |
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* Write and read proxy arrays to/from a stream. The benchmark is run in |
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* batches, with each batch consisting of a fixed number of read/write |
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* cycles. The ObjectOutputStream is reset after each batch of cycles has |
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* completed. |
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* Arguments: <array size> <# batches> <# cycles per batch> |
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*/ |
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public long run(String[] args) throws Exception { |
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int size = 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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Proxy[][] arrays = genArrays(size, 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, arrays, 1); // warmup |
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long start = System.currentTimeMillis(); |
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doReps(oout, oin, sbuf, arrays, nbatches); |
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return System.currentTimeMillis() - start; |
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} |
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/** |
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* Generate proxy arrays. |
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*/ |
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Proxy[][] genArrays(int size, int narrays) throws Exception { |
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Class proxyClass = |
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Proxy.getProxyClass(DummyInterface.class.getClassLoader(), |
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new Class[] { DummyInterface.class }); |
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Constructor proxyCons = |
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proxyClass.getConstructor(new Class[] { InvocationHandler.class }); |
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Object[] consArgs = new Object[] { new DummyHandler() }; |
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Proxy[][] arrays = new Proxy[narrays][size]; |
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for (int i = 0; i < narrays; i++) { |
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for (int j = 0; j < size; j++) { |
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arrays[i][j] = (Proxy) proxyCons.newInstance(consArgs); |
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} |
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} |
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return arrays; |
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} |
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/** |
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* Run benchmark for given number of batches, with given number of cycles |
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* for each batch. |
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*/ |
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void doReps(ObjectOutputStream oout, ObjectInputStream oin, |
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StreamBuffer sbuf, Proxy[][] arrays, int nbatches) |
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throws Exception |
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{ |
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int ncycles = arrays.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(arrays[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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} |