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;
  
  import java.util.concurrent.TimeUnit;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.embedded.EmbeddedChannel;
  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.Param;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.Setup;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.Warmup;
  
  @State(Scope.Thread)
  @Warmup(iterations = 4, time = 1, timeUnit = TimeUnit.SECONDS)
  @Measurement(iterations = 8, time = 4, timeUnit = TimeUnit.SECONDS)
  @Fork(value = 1, jvmArgsAppend = "-Xmx512M")
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  @BenchmarkMode(Mode.SampleTime)
  public class PreaggregatedByteBufsBench
  {
      @Param({ "1000", "2500", "5000", "10000", "20000", "40000"})
      private int len;
  
      private static final int subBufferCount = 64;
  
      private EmbeddedChannel channel;
  
      @Setup
      public void setUp()
      {
          channel = new EmbeddedChannel();
      }
  
      @Benchmark
      public boolean oneBigBuf()
      {
          boolean success = true;
          try
          {
              ByteBuf buf = channel.alloc().directBuffer(len);
              buf.writerIndex(len);
              channel.writeAndFlush(buf);
          }
          catch (Exception e)
          {
              success = false;
          }
          finally
          {
              channel.releaseOutbound();
          }
  
          return success;
      }
  
      @Benchmark
      public boolean chunkedBuf()
      {
          boolean success = true;
          try
          {
              int chunkLen = len / subBufferCount;
  
              for (int i = 0; i < subBufferCount; i++)
              {
                  ByteBuf buf = channel.alloc().directBuffer(chunkLen);
                  buf.writerIndex(chunkLen);
                  channel.write(buf);
              }
              channel.flush();
          }
          catch (Exception e)
          {
              success = false;
          }
          finally
          {
              channel.releaseOutbound();
          }
  
          return success;
      }
  }
  