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.vector;
  
  import java.util.concurrent.TimeUnit;
  import org.apache.arrow.memory.BufferAllocator;
  import org.apache.arrow.memory.RootAllocator;
  import org.apache.arrow.vector.compare.ApproxEqualsVisitor;
  import org.apache.arrow.vector.compare.Range;
  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.Setup;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.TearDown;
  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 floating point vectors. */
  @State(Scope.Benchmark)
  public class FloatingPointBenchmarks {
    // checkstyle:off: MissingJavadocMethod
  
    private static final int VECTOR_LENGTH = 1024;
  
    private static final int ALLOCATOR_CAPACITY = 1024 * 1024;
  
    private BufferAllocator allocator;
  
    private Float4Vector floatVector1;
  
    private Float4Vector floatVector2;
  
    private Float8Vector doubleVector1;
  
    private Float8Vector doubleVector2;
  
    private ApproxEqualsVisitor floatVisitor;
  
    private ApproxEqualsVisitor doubleVisitor;
  
    private Range range;
  
    /** Setup benchmarks. */
    @Setup
    public void prepare() {
      allocator = new RootAllocator(ALLOCATOR_CAPACITY);
      floatVector1 = new Float4Vector("vector", allocator);
      floatVector2 = new Float4Vector("vector", allocator);
      doubleVector1 = new Float8Vector("vector", allocator);
      doubleVector2 = new Float8Vector("vector", allocator);
  
      floatVector1.allocateNew(VECTOR_LENGTH);
      floatVector2.allocateNew(VECTOR_LENGTH);
      doubleVector1.allocateNew(VECTOR_LENGTH);
      doubleVector2.allocateNew(VECTOR_LENGTH);
  
      for (int i = 0; i < VECTOR_LENGTH; i++) {
        if (i % 3 == 0) {
          floatVector1.setNull(i);
          floatVector2.setNull(i);
          doubleVector1.setNull(i);
          doubleVector2.setNull(i);
        } else {
          floatVector1.set(i, i * i);
          floatVector2.set(i, i * i);
          doubleVector1.set(i, i * i);
          doubleVector2.set(i, i * i);
        }
      }
      floatVector1.setValueCount(VECTOR_LENGTH);
      floatVector2.setValueCount(VECTOR_LENGTH);
      doubleVector1.setValueCount(VECTOR_LENGTH);
      doubleVector2.setValueCount(VECTOR_LENGTH);
  
      floatVisitor = new ApproxEqualsVisitor(floatVector1, floatVector2, 0.01f, 0.01);
      doubleVisitor = new ApproxEqualsVisitor(doubleVector1, doubleVector2, 0.01f, 0.01);
      range = new Range(0, 0, VECTOR_LENGTH);
    }
  
    /** Tear down benchmarks. */
    @TearDown
    public void tearDown() {
      floatVector1.close();
      floatVector2.close();
      doubleVector1.close();
      doubleVector2.close();
      allocator.close();
    }
  
    @Benchmark
    @BenchmarkMode(Mode.AverageTime)
    @OutputTimeUnit(TimeUnit.MICROSECONDS)
    public int approxEqualsBenchmark() {
      boolean floatResult = floatVisitor.visit(floatVector1, range);
      boolean doubleResult = doubleVisitor.visit(doubleVector1, range);
      return (floatResult ? 1 : 0) + (doubleResult ? 1 : 0);
    }
  
    public static void main(String[] args) throws RunnerException {
      Options opt =
          new OptionsBuilder()
              .include(FloatingPointBenchmarks.class.getSimpleName())
              .forks(1)
              .build();
  
      new Runner(opt).run();
    }
    // checkstyle:on: MissingJavadocMethod
  }
  