author | redestad |
Wed, 17 Oct 2018 17:30:28 +0200 | |
branch | JEP-230-microbenchmarks-branch |
changeset 56981 | 99cc37ccd75d |
parent 56930 | 079075866d11 |
child 56992 | 8a8b778c8163 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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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package org.openjdk.bench.java.lang; |
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import org.openjdk.jmh.annotations.Benchmark; |
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import org.openjdk.jmh.annotations.BenchmarkMode; |
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import org.openjdk.jmh.annotations.Mode; |
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import org.openjdk.jmh.annotations.OperationsPerInvocation; |
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import org.openjdk.jmh.annotations.OutputTimeUnit; |
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import org.openjdk.jmh.annotations.Scope; |
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import org.openjdk.jmh.annotations.Setup; |
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import org.openjdk.jmh.annotations.State; |
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import java.util.concurrent.TimeUnit; |
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/** |
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* Benchmark measuring System.arraycopy in different ways. |
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*/ |
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@BenchmarkMode(Mode.AverageTime) |
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@OutputTimeUnit(TimeUnit.NANOSECONDS) |
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@State(Scope.Thread) |
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public class ArrayCopy { |
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private static final byte[] TEST_BYTES = "HTTP/1.0".getBytes(); |
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private static final char[] TEST_CHARS = new char[46]; |
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private static final Object[] TEST_OBJECTS = new Object[200]; // Uses a minimum of 160 internal positions for internal copying |
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// a length which the compiler cannot prove is a constant |
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public static int nonConstCharLength = TEST_CHARS.length; |
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public static int nonConstByteLength = TEST_BYTES.length; |
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public static int nonConstObjectLength = TEST_OBJECTS.length; |
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// Use this array to copy objects in. |
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public char[] dummyCharArray = new char[TEST_CHARS.length]; |
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public byte[] dummyByteArray = new byte[TEST_BYTES.length]; |
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public Object[] dummyObjectArray = new Object[TEST_OBJECTS.length]; |
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@Setup |
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public void setup() { |
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for (int i = 0; i < TEST_OBJECTS.length; i++) { |
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TEST_OBJECTS[i] = new Object(); |
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dummyObjectArray[i] = new Object(); |
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} |
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} |
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/** |
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* This test case do the same work as testArrayCopy. We should make sure |
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* testArrayCopy is equally fast or better. Compare the two and you measure |
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* the system call versus explicit copy for-loop. |
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*/ |
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@Benchmark |
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public void copyLoop() { |
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for (int j = 0; j < dummyByteArray.length; j++) { |
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dummyByteArray[j] = TEST_BYTES[j]; |
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} |
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} |
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/** |
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* Test that we can optimize away the code since it should not have any side |
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* effects |
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*/ |
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@Benchmark |
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public void copyLoopLocalArray() { |
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byte[] localDummyByteArray = new byte[TEST_BYTES.length]; |
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for (int j = 0; j < localDummyByteArray.length; j++) { |
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localDummyByteArray[j] = TEST_BYTES[j]; |
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} |
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} |
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/** |
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* This test case do the same work as testArrayCopy. We should make sure |
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* testArrayCopy is equally fast or better. Compare the two and you measure |
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* the system call versus explicit copy for-loop. |
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* <p/> |
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* Uses non-provable constant length. |
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*/ |
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@Benchmark |
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public void copyLoopNonConst() { |
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for (int i = 0; i < nonConstByteLength; i++) { |
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dummyByteArray[i] = TEST_BYTES[i]; |
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} |
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} |
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/** |
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* This test case do the same work as testCopyLoop. We should make sure |
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* testArrayCopy is equally fast or better. Compare the two and you measure |
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* the system call versus explicit copy for-loop. |
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*/ |
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@Benchmark |
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public void arrayCopy() { |
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System.arraycopy(TEST_BYTES, 0, dummyByteArray, 0, dummyByteArray.length); |
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} |
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/** |
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* Test that we can optimize away the code since it should not have any side |
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* effects |
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*/ |
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@Benchmark |
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public void arrayCopyLocalArray() { |
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byte[] localDummyByteArray = new byte[TEST_BYTES.length]; |
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System.arraycopy(TEST_BYTES, 0, localDummyByteArray, 0, localDummyByteArray.length); |
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} |
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/** |
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* This test case do the same work as testCopyLoop. We should make sure |
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* testArrayCopy is equally fast or better. Compare the two and you measure |
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* the system call versus explicit copy for-loop. |
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* <p/> |
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* Uses non-provable constant length. |
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*/ |
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@Benchmark |
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public void arrayCopyNonConst() { |
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System.arraycopy(TEST_BYTES, 0, dummyByteArray, 0, nonConstByteLength); |
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} |
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|
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138 |
@Benchmark |
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139 |
public void arrayCopyChar() { |
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System.arraycopy(TEST_CHARS, 0, dummyCharArray, 0, dummyCharArray.length); |
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} |
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|
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143 |
@Benchmark |
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public void arrayCopyCharNonConst() { |
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System.arraycopy(TEST_CHARS, 0, dummyCharArray, 0, nonConstCharLength); |
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} |
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|
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@Benchmark |
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public void arrayCopyObject() { |
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System.arraycopy(TEST_OBJECTS, 0, dummyObjectArray, 0, dummyObjectArray.length); |
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151 |
} |
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|
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153 |
@Benchmark |
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public void arrayCopyObjectNonConst() { |
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System.arraycopy(TEST_OBJECTS, 0, dummyObjectArray, 0, nonConstObjectLength); |
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} |
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|
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158 |
/** |
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159 |
* This test copies inside a object array, that is same source array as dest |
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* array. Copies backwards in the array. |
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*/ |
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162 |
@Benchmark |
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163 |
@OperationsPerInvocation(40) |
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public void arrayCopyObjectSameArraysBackward() { |
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165 |
for (int i = 0; i < 40; i++) { |
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System.arraycopy(dummyObjectArray, i, dummyObjectArray, i + 40, 80); |
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} |
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168 |
} |
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169 |
|
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170 |
/** |
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171 |
* This test copies inside a object array, that is same source array as dest |
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172 |
* array. Copies forward in the array. There is a special version for this |
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173 |
* in JRockit. |
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*/ |
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175 |
@Benchmark |
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176 |
@OperationsPerInvocation(40) |
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177 |
public void arrayCopyObjectSameArraysForward() { |
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178 |
for (int i = 0; i < 40; i++) { |
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System.arraycopy(dummyObjectArray, i + 40, dummyObjectArray, i, 80); |
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} |
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181 |
} |
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} |