| /* |
| * Copyright (C) 2011 The Guava Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.common.util.concurrent; |
| |
| import com.google.caliper.BeforeExperiment; |
| import com.google.caliper.Benchmark; |
| import com.google.caliper.Param; |
| import java.util.concurrent.locks.Lock; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| /** |
| * Benchmarks for {@link CycleDetectingLockFactory}. |
| * |
| * @author Darick Tong |
| */ |
| public class CycleDetectingLockFactoryBenchmark { |
| |
| @Param({"2", "3", "4", "5", "10"}) |
| int lockNestingDepth; |
| |
| CycleDetectingLockFactory factory; |
| private Lock[] plainLocks; |
| private Lock[] detectingLocks; |
| |
| @BeforeExperiment |
| void setUp() throws Exception { |
| this.factory = CycleDetectingLockFactory.newInstance(CycleDetectingLockFactory.Policies.WARN); |
| this.plainLocks = new Lock[lockNestingDepth]; |
| for (int i = 0; i < lockNestingDepth; i++) { |
| plainLocks[i] = new ReentrantLock(); |
| } |
| this.detectingLocks = new Lock[lockNestingDepth]; |
| for (int i = 0; i < lockNestingDepth; i++) { |
| detectingLocks[i] = factory.newReentrantLock("Lock" + i); |
| } |
| } |
| |
| @Benchmark |
| void unorderedPlainLocks(int reps) { |
| lockAndUnlock(new ReentrantLock(), reps); |
| } |
| |
| @Benchmark |
| void unorderedCycleDetectingLocks(int reps) { |
| lockAndUnlock(factory.newReentrantLock("foo"), reps); |
| } |
| |
| private static void lockAndUnlock(Lock lock, int reps) { |
| for (int i = 0; i < reps; i++) { |
| lock.lock(); |
| lock.unlock(); |
| } |
| } |
| |
| @Benchmark |
| void orderedPlainLocks(int reps) { |
| lockAndUnlockNested(plainLocks, reps); |
| } |
| |
| @Benchmark |
| void orderedCycleDetectingLocks(int reps) { |
| lockAndUnlockNested(detectingLocks, reps); |
| } |
| |
| private static void lockAndUnlockNested(Lock[] locks, int reps) { |
| for (int i = 0; i < reps; i++) { |
| for (int j = 0; j < locks.length; j++) { |
| locks[j].lock(); |
| } |
| for (int j = locks.length - 1; j >= 0; j--) { |
| locks[j].unlock(); |
| } |
| } |
| } |
| } |