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.arrow.memory;
  
  import java.util.concurrent.TimeUnit;
  import org.apache.arrow.memory.rounding.RoundingPolicy;
  import org.apache.arrow.memory.rounding.SegmentRoundingPolicy;
  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.runner.Runner;
  import org.openjdk.jmh.runner.RunnerException;
  import org.openjdk.jmh.runner.options.Options;
  import org.openjdk.jmh.runner.options.OptionsBuilder;
  
  /** Benchmarks for allocators. */
  public class AllocatorBenchmarks {
  
    /** Benchmark for the default allocator. */
    @Benchmark
    @BenchmarkMode(Mode.AverageTime)
    @OutputTimeUnit(TimeUnit.MICROSECONDS)
    public void defaultAllocatorBenchmark() {
      final int bufferSize = 1024;
      final int numBuffers = 1024;
  
      try (RootAllocator allocator = new RootAllocator(numBuffers * bufferSize)) {
        ArrowBuf[] buffers = new ArrowBuf[numBuffers];
  
        for (int i = 0; i < numBuffers; i++) {
          buffers[i] = allocator.buffer(bufferSize);
        }
  
        for (int i = 0; i < numBuffers; i++) {
          buffers[i].close();
        }
      }
    }
  
    /** Benchmark for allocator with segment rounding policy. */
    @Benchmark
    @BenchmarkMode(Mode.AverageTime)
    @OutputTimeUnit(TimeUnit.MICROSECONDS)
    public void segmentRoundingPolicyBenchmark() {
      final long bufferSize = 1024L;
      final int numBuffers = 1024;
      final long segmentSize = 1024L;
  
      RoundingPolicy policy = new SegmentRoundingPolicy(segmentSize);
      try (RootAllocator allocator =
          new RootAllocator(AllocationListener.NOOP, bufferSize * numBuffers, policy)) {
        ArrowBuf[] buffers = new ArrowBuf[numBuffers];
  
        for (int i = 0; i < numBuffers; i++) {
          buffers[i] = allocator.buffer(bufferSize);
        }
  
        for (int i = 0; i < numBuffers; i++) {
          buffers[i].close();
        }
      }
    }
  
    public static void main(String[] args) throws RunnerException {
      Options opt =
          new OptionsBuilder().include(AllocatorBenchmarks.class.getSimpleName()).forks(1).build();
  
      new Runner(opt).run();
    }
  }
  