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1   /*
2    * Copyright 2017 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.buffer;
17  
18  import org.openjdk.jmh.annotations.Benchmark;
19  import org.openjdk.jmh.annotations.BenchmarkMode;
20  import org.openjdk.jmh.annotations.Measurement;
21  import org.openjdk.jmh.annotations.Mode;
22  import org.openjdk.jmh.annotations.Param;
23  import org.openjdk.jmh.annotations.Threads;
24  import org.openjdk.jmh.annotations.Warmup;
25  
26  @BenchmarkMode(Mode.Throughput)
27  @Threads(16)
28  @Warmup(iterations = 5)
29  @Measurement(iterations = 10)
30  public class ByteBufNoCleanerChangeCapacityBenchmark extends AbstractByteBufNoCleanerBenchmark {
31      private static final int MAX_DIRECT_MEMORY_PER_THREAD = 1024 * 1024; // 1 mb per thread.
32  
33      @Param("1024")
34      public int initialCapacity;
35  
36      @Benchmark
37      public boolean capacityChange() {
38          ByteBuf buffer = bufferType.newBuffer(initialCapacity);
39          // Change capacity until we would exceed the 1mb per thread limit
40          for (int newCapacity = initialCapacity << 1; newCapacity <= MAX_DIRECT_MEMORY_PER_THREAD;
41               newCapacity += initialCapacity) {
42              buffer.capacity(newCapacity);
43          }
44          return buffer.release();
45      }
46  }