324 lines
9.7 KiB
Java
324 lines
9.7 KiB
Java
/*
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* Copyright (c) 2014, 2021, 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.vm.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.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.Param;
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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.Threads;
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import org.openjdk.jmh.annotations.Warmup;
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import java.util.concurrent.TimeUnit;
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/**
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* Benchmark class for simple lock unlock tests. Nothing big should ever go into this class.
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@State(Scope.Benchmark)
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@Warmup(iterations = 4, time = 2)
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@Measurement(iterations = 4, time = 2)
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@Fork(value = 3)
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public class LockUnlock {
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@Param("100")
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private int innerCount;
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public Object lockObject1;
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public Object lockObject2;
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public volatile Object lockObject3Inflated;
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public volatile Object lockObject4Inflated;
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public int factorial;
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public int dummyInt1;
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public int dummyInt2;
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@Setup
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public void setup() {
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lockObject1 = new Object();
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lockObject2 = new Object();
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lockObject3Inflated = new Object();
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lockObject4Inflated = new Object();
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// Inflate the lock to use an ObjectMonitor
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try {
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synchronized (lockObject3Inflated) {
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lockObject3Inflated.wait(1);
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}
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synchronized (lockObject4Inflated) {
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lockObject4Inflated.wait(1);
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}
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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dummyInt1 = 47;
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dummyInt2 = 11; // anything
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}
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/** Perform a synchronized on a local object within a loop. */
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@Benchmark
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public void testBasicSimpleLockUnlockLocal() {
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Object localObject = lockObject1;
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for (int i = 0; i < innerCount; i++) {
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synchronized (localObject) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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/** Perform a synchronized on an object within a loop. */
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@Benchmark
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public void testBasicSimpleLockUnlock() {
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for (int i = 0; i < innerCount; i++) {
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synchronized (lockObject1) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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/** Perform a synchronized on a local object within a loop. */
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@Benchmark
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public void testInflatedSimpleLockUnlockLocal() {
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Object localObject = lockObject3Inflated;
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for (int i = 0; i < innerCount; i++) {
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synchronized (localObject) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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/** Perform a synchronized on an object within a loop. */
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@Benchmark
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public void testInflatedSimpleLockUnlock() {
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for (int i = 0; i < innerCount; i++) {
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synchronized (lockObject3Inflated) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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/** Perform a recursive synchronized on a local object within a loop. */
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@Benchmark
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public void testBasicRecursiveLockUnlockLocal() {
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Object localObject = lockObject1;
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for (int i = 0; i < innerCount; i++) {
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synchronized (localObject) {
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synchronized (localObject) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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}
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/** Perform a recursive synchronized on an object within a loop. */
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@Benchmark
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public void testBasicRecursiveLockUnlock() {
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for (int i = 0; i < innerCount; i++) {
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synchronized (lockObject1) {
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synchronized (lockObject1) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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}
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/** Perform two synchronized after each other on the same local object. */
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@Benchmark
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public void testBasicSerialLockUnlockLocal() {
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Object localObject = lockObject1;
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for (int i = 0; i < innerCount; i++) {
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synchronized (localObject) {
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dummyInt1++;
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}
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synchronized (localObject) {
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dummyInt2++;
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}
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}
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}
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/** Perform two synchronized after each other on the same object. */
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@Benchmark
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public void testBasicSerialLockUnlock() {
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for (int i = 0; i < innerCount; i++) {
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synchronized (lockObject1) {
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dummyInt1++;
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}
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synchronized (lockObject1) {
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dummyInt2++;
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}
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}
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}
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/** Perform two synchronized after each other on the same local object. */
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@Benchmark
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public void testInflatedSerialLockUnlockLocal() {
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Object localObject = lockObject3Inflated;
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for (int i = 0; i < innerCount; i++) {
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synchronized (localObject) {
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dummyInt1++;
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}
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synchronized (localObject) {
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dummyInt2++;
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}
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}
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}
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/** Perform two synchronized after each other on the same object. */
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@Benchmark
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public void testInflatedSerialLockUnlock() {
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for (int i = 0; i < innerCount; i++) {
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synchronized (lockObject3Inflated) {
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dummyInt1++;
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}
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synchronized (lockObject3Inflated) {
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dummyInt2++;
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}
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}
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}
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/** Perform two synchronized after each other on the same object. */
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@Benchmark
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public void testInflatedMultipleSerialLockUnlock() {
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for (int i = 0; i < innerCount; i++) {
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synchronized (lockObject3Inflated) {
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dummyInt1++;
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}
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synchronized (lockObject4Inflated) {
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dummyInt2++;
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}
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}
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}
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/** Perform two synchronized after each other on the same object. */
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@Benchmark
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public void testInflatedMultipleRecursiveLockUnlock() {
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for (int i = 0; i < innerCount; i++) {
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synchronized (lockObject3Inflated) {
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dummyInt1++;
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synchronized (lockObject4Inflated) {
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dummyInt2++;
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}
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}
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}
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}
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/** Perform a recursive-only synchronized on a local object within a loop. */
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@Benchmark
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public void testInflatedRecursiveOnlyLockUnlockLocal() {
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Object localObject = lockObject3Inflated;
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synchronized (localObject) {
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for (int i = 0; i < innerCount; i++) {
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synchronized (localObject) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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}
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/** Perform a recursive-only synchronized on an object within a loop. */
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@Benchmark
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public void testInflatedRecursiveOnlyLockUnlock() {
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synchronized (lockObject3Inflated) {
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for (int i = 0; i < innerCount; i++) {
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synchronized (lockObject3Inflated) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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}
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/** Perform a recursive-only synchronized on a local object within a loop. */
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@Benchmark
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public void testInflatedRecursiveLockUnlockLocal() {
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Object localObject = lockObject3Inflated;
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for (int i = 0; i < innerCount; i++) {
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synchronized (localObject) {
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synchronized (localObject) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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}
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/** Perform a recursive-only synchronized on an object within a loop. */
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@Benchmark
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public void testInflatedRecursiveLockUnlock() {
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for (int i = 0; i < innerCount; i++) {
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synchronized (lockObject3Inflated) {
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synchronized (lockObject3Inflated) {
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dummyInt1++;
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dummyInt2++;
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}
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}
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}
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}
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/**
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* Performs recursive synchronizations on the same local object.
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* <p/>
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* Result is 3628800
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*/
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@Benchmark
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public void testRecursiveSynchronization() {
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factorial = fact(10);
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}
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private synchronized int fact(int n) {
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if (n == 0) {
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return 1;
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} else {
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return fact(n - 1) * n;
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}
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}
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/**
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* With three threads lockObject1 will be contended so should be
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* inflated. Three threads is also needed to ensure a high level
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* of code coverage in the locking code.
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*/
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@Threads(3)
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@Benchmark
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public void testContendedLock() {
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synchronized (lockObject1) {
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dummyInt1++;
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}
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}
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}
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