package org.cache2k.benchmark.jmh.suite.eviction.symmetrical;
/*
* #%L
* Benchmarks: JMH suite.
* %%
* Copyright (C) 2013 - 2017 headissue GmbH, Munich
* %%
* 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.
* #L%
*/
import org.cache2k.benchmark.BenchmarkCache;
import org.cache2k.benchmark.jmh.BenchmarkBase;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.TearDown;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Continuously access a cache of size 1M an ascending sequence, never producing any hit.
* Each thread starts at another offset.
*
* @author Jens Wilke
*/
@State(Scope.Benchmark)
public class NeverHitBenchmark extends BenchmarkBase {
public static final int ENTRY_COUNT = 1000 * 1000;
private final static AtomicInteger offset = new AtomicInteger(0);
@State(Scope.Thread)
public static class ThreadState {
long index = offset.getAndAdd(Integer.MAX_VALUE / 16);
}
BenchmarkCache<Integer, Integer> cache;
@Setup(Level.Iteration)
public void setup() throws Exception {
cache = getFactory().create(ENTRY_COUNT);
}
@TearDown(Level.Iteration)
public void tearDown() {
recordMemoryAndDestroy(cache);
cache = null;
}
@Benchmark @BenchmarkMode(Mode.Throughput)
public long operation(ThreadState threadState, HitCountRecorder rec) {
int idx = (int) (threadState.index++);
Integer k = idx;
Integer v = cache.getIfPresent(k);
if (v != null) {
rec.hitCount++;
} else {
rec.missCount++;
}
cache.put(k, k);
return idx;
}
}