| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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 org.apache.logging.log4j.perf.jmh; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| import org.openjdk.jmh.annotations.Benchmark; |
| import org.openjdk.jmh.annotations.BenchmarkMode; |
| import org.openjdk.jmh.annotations.Mode; |
| import org.openjdk.jmh.annotations.OutputTimeUnit; |
| import org.openjdk.jmh.annotations.Scope; |
| import org.openjdk.jmh.annotations.State; |
| |
| /** |
| * From <a href="http://shipilev.net/blog/2014/nanotrusting-nanotime/">http://shipilev.net/blog/2014/nanotrusting-nanotime/</a>. |
| */ |
| // ============================== HOW TO RUN THIS TEST: ==================================== |
| // |
| // single thread: |
| // java -jar log4j-perf/target/benchmarks.jar ".*Nanotime.*" -f 1 -wi 5 -i 5 |
| // |
| // multiple threads (for example, 4 threads): |
| // java -jar log4j-perf/target/benchmarks.jar ".*Nanotime.*" -f 1 -wi 5 -i 5 -t 4 -si true |
| // |
| // Usage help: |
| // java -jar log4j-perf/target/benchmarks.jar -help |
| // |
| @State(Scope.Benchmark) |
| public class NanotimeBenchmark { |
| |
| public static void main(final String[] args) { |
| } |
| |
| @Benchmark |
| @BenchmarkMode(Mode.SampleTime) |
| @OutputTimeUnit(TimeUnit.NANOSECONDS) |
| public void baseline() { |
| } |
| |
| @Benchmark |
| @BenchmarkMode(Mode.SampleTime) |
| @OutputTimeUnit(TimeUnit.NANOSECONDS) |
| public long latency_nanotime() { |
| return System.nanoTime(); |
| } |
| |
| private long lastValue; |
| |
| @Benchmark |
| @BenchmarkMode(Mode.SampleTime) |
| @OutputTimeUnit(TimeUnit.NANOSECONDS) |
| public long granularity_nanotime() { |
| long cur; |
| do { |
| cur = System.nanoTime(); |
| } while (cur == lastValue); |
| lastValue = cur; |
| return cur; |
| } |
| } |