| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.jackrabbit.oak.cache; |
| |
| import static org.junit.Assert.assertFalse; |
| |
| import java.util.Random; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.junit.Ignore; |
| import org.junit.Test; |
| |
| import com.google.common.cache.Cache; |
| import com.google.common.cache.CacheBuilder; |
| |
| /** |
| * Compares the LIRS cache by concurrently reading. |
| */ |
| public class ConcurrentPerformanceTest { |
| |
| private static Cache<Integer, Integer> buildCache(boolean lirs, |
| int concurrencyLevel) { |
| if (lirs) { |
| return new CacheLIRS.Builder<Integer, Integer>() |
| .segmentCount(concurrencyLevel).maximumSize(1000).build(); |
| } |
| return CacheBuilder.newBuilder().concurrencyLevel(concurrencyLevel) |
| .maximumSize(1000).build(); |
| } |
| |
| @Test |
| @Ignore |
| public void testPerformance() throws Exception { |
| System.out.println("warmup..."); |
| testPerformance(2, 2, false); |
| testPerformance(2, 2, true); |
| testPerformance(2, 2, false); |
| testPerformance(2, 2, true); |
| System.out.println("test"); |
| for (int concurrencyLevel = 1; concurrencyLevel <= 128; concurrencyLevel *= 4) { |
| for (int threadCount = 1; threadCount <= 128; threadCount *= 4) { |
| testPerformance(threadCount, concurrencyLevel, false); |
| } |
| } |
| for (int concurrencyLevel = 1; concurrencyLevel <= 128; concurrencyLevel *= 4) { |
| for (int threadCount = 1; threadCount <= 128; threadCount *= 4) { |
| testPerformance(threadCount, concurrencyLevel, true); |
| } |
| } |
| } |
| |
| private static void testPerformance(int threadCount, int concurrencyLevel, |
| boolean lirs) throws Exception { |
| final Cache<Integer, Integer> cache = buildCache(lirs, concurrencyLevel); |
| Thread[] threads = new Thread[threadCount]; |
| final AtomicBoolean stop = new AtomicBoolean(); |
| final AtomicInteger count = new AtomicInteger(); |
| for (int i = 0; i < threadCount; i++) { |
| Thread t = new Thread() { |
| @Override |
| public void run() { |
| Random r = new Random(); |
| while (!stop.get()) { |
| final int key = r.nextInt(20000); |
| try { |
| cache.get(key, new Callable<Integer>() { |
| |
| @Override |
| public Integer call() throws Exception { |
| return key; |
| } |
| |
| }); |
| } catch (ExecutionException e) { |
| count.set(Integer.MIN_VALUE); |
| stop.set(true); |
| } |
| count.incrementAndGet(); |
| } |
| } |
| }; |
| t.start(); |
| threads[i] = t; |
| } |
| // test for 1000 ms |
| Thread.sleep(1000); |
| stop.set(true); |
| System.out.println("threads " + threadCount + |
| " concurrency " + concurrencyLevel + " ops/s " + count + |
| " " + (lirs ? "lirs" : "guava")); |
| for (Thread t : threads) { |
| t.join(1000); |
| // if the thread is still alive after 1 second, we assume |
| // there is a deadlock - we just let the threads alive, |
| // but report a failure (what else could we do?) |
| if (t.isAlive()) { |
| assertFalse("Deadlock detected!", t.isAlive()); |
| } |
| } |
| } |
| |
| } |