52169cba95
Motivation: SpotJMHBugs reports that accumulating a value as a way of eliding dead code elimination may be inadvisable, as discussed in `JMHSample_34_SafeLooping::measureWrong_2`. Change the test so that it consumes the response with `Blackhole::consume` instead. Modifications: - Replace addition of results with explicit `blackhole.consume()` call Result: Tests work as before, but with different benchmark numbers.
77 lines
2.5 KiB
Java
77 lines
2.5 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.microbench.concurrent;
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import io.netty.microbench.util.AbstractMicrobenchmark;
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import io.netty.util.concurrent.FastThreadLocal;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Threads;
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import org.openjdk.jmh.infra.Blackhole;
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import java.util.Random;
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/**
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* This class benchmarks the slow path of FastThreadLocal and the JDK ThreadLocal.
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*/
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@Threads(4)
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@Measurement(iterations = 10, batchSize = 100)
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public class FastThreadLocalSlowPathBenchmark extends AbstractMicrobenchmark {
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private static final Random rand = new Random();
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@SuppressWarnings("unchecked")
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private static final ThreadLocal<Integer>[] jdkThreadLocals = new ThreadLocal[128];
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@SuppressWarnings("unchecked")
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private static final FastThreadLocal<Integer>[] fastThreadLocals = new FastThreadLocal[jdkThreadLocals.length];
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static {
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for (int i = 0; i < jdkThreadLocals.length; i ++) {
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final int num = rand.nextInt();
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jdkThreadLocals[i] = new ThreadLocal<Integer>() {
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@Override
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protected Integer initialValue() {
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return num;
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}
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};
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fastThreadLocals[i] = new FastThreadLocal<Integer>() {
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@Override
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protected Integer initialValue() {
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return num;
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}
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};
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}
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}
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public FastThreadLocalSlowPathBenchmark() {
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super(false, true);
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}
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@Benchmark
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public void jdkThreadLocalGet(Blackhole bh) {
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for (ThreadLocal<Integer> i: jdkThreadLocals) {
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bh.consume(i.get());
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}
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}
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@Benchmark
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public void fastThreadLocal(Blackhole bh) {
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for (FastThreadLocal<Integer> i: fastThreadLocals) {
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bh.consume(i.get());
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}
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}
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}
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