/*
* 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:
*
* 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 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 java.util.Random;
/**
* This class benchmarks different allocators with different allocation sizes.
*/
@Threads(4)
@Measurement(iterations = 10, batchSize = 100)
public class FastThreadLocalBenchmark extends AbstractMicrobenchmark {
private static final Random rand = new Random();
@SuppressWarnings("unchecked")
private static final ThreadLocal<Integer>[] jdkThreadLocals = new ThreadLocal[128];
@SuppressWarnings("unchecked")
private static final FastThreadLocal<Integer>[] fastThreadLocals = new FastThreadLocal[jdkThreadLocals.length];
static {
for (int i = 0; i < jdkThreadLocals.length; i ++) {
jdkThreadLocals[i] = new ThreadLocal<Integer>() {
@Override
protected Integer initialValue() {
return rand.nextInt();
}
};
}
for (int i = 0; i < fastThreadLocals.length; i ++) {
fastThreadLocals[i] = new FastThreadLocal<Integer>() {
@Override
protected Integer initialValue() {
return rand.nextInt();
}
};
}
}
@Benchmark
public int jdkThreadLocalGet() {
int result = 0;
for (ThreadLocal<Integer> i: jdkThreadLocals) {
result += i.get();
}
return result;
}
@Benchmark
public int fastThreadLocal() {
int result = 0;
for (FastThreadLocal<Integer> i: fastThreadLocals) {
result += i.get();
}
return result;
}
}