io.netty.microbench.concurrent.FastThreadLocalFastPathBenchmark Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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:
*
* https://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 io.netty.microbench.concurrent;
import io.netty.microbench.util.AbstractMicrobenchmark;
import io.netty.util.concurrent.FastThreadLocal;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Threads;
import org.openjdk.jmh.infra.Blackhole;
import java.util.Random;
/**
* This class benchmarks the fast path of FastThreadLocal and the JDK ThreadLocal.
*/
@Threads(4)
@Measurement(iterations = 10, batchSize = 100)
public class FastThreadLocalFastPathBenchmark extends AbstractMicrobenchmark {
private static final Random rand = new Random();
@SuppressWarnings("unchecked")
private static final ThreadLocal[] jdkThreadLocals = new ThreadLocal[128];
@SuppressWarnings("unchecked")
private static final FastThreadLocal[] fastThreadLocals = new FastThreadLocal[jdkThreadLocals.length];
static {
for (int i = 0; i < jdkThreadLocals.length; i ++) {
final int num = rand.nextInt();
jdkThreadLocals[i] = new ThreadLocal() {
@Override
protected Integer initialValue() {
return num;
}
};
fastThreadLocals[i] = new FastThreadLocal() {
@Override
protected Integer initialValue() {
return num;
}
};
}
}
@Benchmark
public void jdkThreadLocalGet(Blackhole bh) {
for (ThreadLocal i: jdkThreadLocals) {
bh.consume(i.get());
}
}
@Benchmark
public void fastThreadLocal(Blackhole bh) {
for (FastThreadLocal i: fastThreadLocals) {
bh.consume(i.get());
}
}
}