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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package org.openjdk.btrace.bench;

import java.util.concurrent.TimeUnit;
import org.openjdk.btrace.runtime.profiling.MethodInvocationProfiler;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
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.annotations.Threads;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import org.openjdk.jmh.runner.options.VerboseMode;

/**
 * Basic benchmark for the performance of {@linkplain MethodInvocationProfiler}
 *
 * @author Jaroslav Bachorik
 */
@State(Scope.Thread)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@Fork(1)
@BenchmarkMode(Mode.AverageTime)
public class ProfilerBenchmark {
  private MethodInvocationProfiler mip1;
  private MethodInvocationProfiler mip2;

  @Setup
  public void setup() {
    mip1 = new MethodInvocationProfiler(1);
    mip2 = new MethodInvocationProfiler(500);
  }

  @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Measurement(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Benchmark
  @Threads(1)
  public void testOneMethodSingleThread() {
    mip1.recordEntry("a");
    mip1.recordExit("a", 1);
  }

  @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Measurement(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Benchmark
  @Threads(1)
  public void testTwoMethods01Thread() {
    mip2.recordEntry("a");
    mip2.recordEntry("b");
    mip2.recordExit("b", 10);
    mip2.recordExit("a", 1);
  }

  @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Measurement(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Benchmark
  @Threads(2)
  public void testTwoMethods02Threads() {
    mip2.recordEntry("a");
    mip2.recordEntry("b");
    mip2.recordExit("b", 10);
    mip2.recordExit("a", 1);
  }

  @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Measurement(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Benchmark
  @Threads(4)
  public void testTwoMethods04Threads() {
    mip2.recordEntry("a");
    mip2.recordEntry("b");
    mip2.recordExit("b", 10);
    mip2.recordExit("a", 1);
  }

  @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Measurement(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Benchmark
  @Threads(8)
  public void testTwoMethods08Threads() {
    mip2.recordEntry("a");
    mip2.recordEntry("b");
    mip2.recordExit("b", 10);
    mip2.recordExit("a", 1);
  }

  @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Measurement(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
  @Benchmark
  @Threads(16)
  public void testTwoMethods16Threads() {
    mip2.recordEntry("a");
    mip2.recordEntry("b");
    mip2.recordExit("b", 10);
    mip2.recordExit("a", 1);
  }

  public static void main(String[] args) throws Exception {
    Options opt =
        new OptionsBuilder()
            .addProfiler("stack")
            .verbosity(VerboseMode.NORMAL)
            .include(".*" + ProfilerBenchmark.class.getSimpleName() + ".*test.*")
            .build();

    new Runner(opt).run();
  }
}
