content: /*
   * 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.cassandra.test.microbench.btree;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import com.google.common.collect.ImmutableList;
  
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.Fork;
  import org.openjdk.jmh.annotations.Level;
  import org.openjdk.jmh.annotations.Measurement;
  import org.openjdk.jmh.annotations.Mode;
  import org.openjdk.jmh.annotations.OutputTimeUnit;
  import org.openjdk.jmh.annotations.Param;
  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;
  
  @BenchmarkMode(Mode.Throughput)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  @Warmup(iterations = 4, time = 1, timeUnit = TimeUnit.SECONDS)
  @Measurement(iterations = 8, time = 2, timeUnit = TimeUnit.SECONDS)
  @Fork(value = 2)
  @Threads(4)
  @State(Scope.Benchmark)
  public class BTreeBench extends Megamorphism
  {
      final AtomicInteger uniqueThreadInitialisation = new AtomicInteger();
  
      Integer[] data;
      // three iterables to simulate megamorphic callsites for iterable
      List<Integer> dataAsIterable1;
      List<Integer> dataAsIterable2;
      List<Integer> dataAsIterable3;
  
  //     produces sizes between [n/2..n+n/2]
      @Param({"1", "4", "16", "64", "256", "1024", "16384"})
      int dataSize;
  
      @Setup(Level.Trial)
      public void setup()
      {
          setup(dataSize);
      }
  
      void setup(int size)
      {
          data = new Integer[size + size/2];
          for (int i = 0 ; i < data.length; i++)
              data[i] = i;
          dataAsIterable1 = Arrays.asList(data);
          dataAsIterable2 = ImmutableList.copyOf(data);
          dataAsIterable3 = new ArrayList<>(dataSize);
          dataAsIterable3.addAll(dataAsIterable1);
      }
  
      @State(Scope.Thread)
      public static class BuildSizeState extends IntVisitor
      {
          @Setup(Level.Trial)
          public void setup(BTreeBench bench)
          {
              super.setup(bench.dataSize);
          }
      }
  }
  