251 lines
8.8 KiB
Java
251 lines
8.8 KiB
Java
/*
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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.
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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.io;
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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.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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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 org.openjdk.jmh.annotations.Warmup;
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import org.openjdk.jmh.infra.Blackhole;
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import java.io.ObjectStreamClass;
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import java.io.Serializable;
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import java.util.LinkedList;
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import java.util.concurrent.TimeUnit;
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/**
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* A micro benchmark used to measure the performance impact from multi threaded access to ObjectStreamClass.
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@Fork(2)
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@Warmup(iterations = 4, time = 2, timeUnit = TimeUnit.SECONDS)
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@Measurement(iterations = 4, time = 2, timeUnit = TimeUnit.SECONDS)
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@State(Scope.Thread)
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public class ObjectStreamClasses {
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public Class<?>[] classes;
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@Setup
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public void setup() {
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LinkedList<Class> queue = new LinkedList<Class>();
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int i = 0;
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while (true) {
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// Loop until we get a ClassNotFoundException
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// Maybe rewrite this considering the fact that there are 29
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// inner classes available?
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try {
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Class clazz = Class.forName(ObjectStreamClasses.class.getName() + "$SerializableClass" + i++);
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queue.add(clazz);
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} catch (ClassNotFoundException e) {
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break;
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}
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}
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classes = new Class[queue.size()];
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// Make ObjectStreamClass load all classes into the static map
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i = 0;
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while (!queue.isEmpty()) {
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classes[i] = (Class) queue.remove();
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i++;
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}
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}
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/**
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* Tests the static lookup function. Depending on JRE version the internal behavior is different but the general
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* behavior is a synchronized call to some sort of static container.
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*/
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@Benchmark
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public void testLookup(Blackhole bh) {
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for (Class<?> klass : classes) {
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bh.consume(ObjectStreamClass.lookup(klass));
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}
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}
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static class SerializableClass0 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass1 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass2 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass3 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass4 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass5 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass6 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass7 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass8 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass9 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass10 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass11 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass12 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass13 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass14 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass15 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass16 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass17 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass18 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass19 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass20 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass21 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass22 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass23 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass24 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass25 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass26 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass27 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass28 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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static class SerializableClass29 extends SerializableClass {
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private static final long serialVersionUID = 1L;
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}
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@SuppressWarnings("unused")
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private static class SerializableClass implements Serializable {
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private static final long serialVersionUID = 6107539118220989250L;
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public Object objectField00 = new Object();
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public Object objectField01 = new Object();
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public Object objectField02 = new Object();
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public Object objectField03 = new Object();
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public Object objectField04 = new Object();
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public Object objectField05 = new Object();
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public Object objectField06 = new Object();
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public Object objectField07 = new Object();
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public Object objectField08 = new Object();
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public Object objectField09 = new Object();
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public Object objectField10 = new Object();
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public Object objectField11 = new Object();
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public Object objectField12 = new Object();
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public Object objectField13 = new Object();
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public Object objectField14 = new Object();
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public Object objectField15 = new Object();
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public Object objectField16 = new Object();
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public Object objectField17 = new Object();
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public Object objectField18 = new Object();
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public Object objectField19 = new Object();
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public Object objectField20 = new Object();
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public Object objectField21 = new Object();
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public Object objectField22 = new Object();
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public Object objectField23 = new Object();
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public Object objectField24 = new Object();
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public Object objectField25 = new Object();
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public Object objectField26 = new Object();
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public Object objectField27 = new Object();
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public Object objectField28 = new Object();
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public Object objectField29 = new Object();
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SerializableClass() {
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super();
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}
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}
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}
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