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/*
* Copyright 2019 Google LLC
*
* 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.
*/
package io.perfmark.testing;
import io.perfmark.impl.Generator;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.GroupThreads;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.infra.Blackhole;
@State(Scope.Benchmark)
public class GeneratorBenchmark {
private Generator generator;
@Setup(Level.Trial)
public void setUp() {
generator = getGenerator();
generator.setGeneration(Generator.FAILURE);
}
protected Generator getGenerator() {
throw new UnsupportedOperationException();
}
@Benchmark
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public void ifEnabled() {
if (isEnabled(getGeneration())) {
Blackhole.consumeCPU(1000);
}
}
@Benchmark
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public long getGeneration() {
return generator.getGeneration();
}
@Benchmark
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public long getAndSetAndGetGeneration() {
long oldGeneration = generator.getGeneration();
generator.setGeneration(oldGeneration + 1);
return generator.getGeneration();
}
@Benchmark
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@GroupThreads(3)
public long racyGetAndSetAndGetGeneration() {
long oldGeneration = generator.getGeneration();
generator.setGeneration(oldGeneration + 1);
return generator.getGeneration();
}
protected static boolean isEnabled(long gen) {
return ((gen >>> Generator.GEN_OFFSET) & 0x1L) != 0L;
}
}
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