HeapVsByteBuffer.java

package lol;

import java.nio.ByteBuffer;
import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.*;

/**
 * Created by grinder on 29.04.17.
 */
@Warmup(iterations = 5, time = 1)
@Measurement(iterations = 5, time = 1)
@Fork(value = 3, jvmArgsAppend = {"-XX:+UseParallelGC", "-Xms1g", "-Xmx1g"})
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Benchmark)
public class HeapVsByteBuffer {


    private ByteBuffer buffer;
    private ByteBuffer directBuffer;
    private byte[] array;
    private byte value = 0b01;

    @Setup
    public void setup() {
        array = new byte[10];
        buffer = ByteBuffer.allocate(10);
        directBuffer = ByteBuffer.allocateDirect(10);
    }

    @Group("write")
    @Benchmark
    public void heapWrite() {
       array[5]=value;
    }
    @Group("write")
    @Benchmark
    public void byteBufferWrite() {
        buffer.put(5, value);
    }
    @Group("write")
    @Benchmark
    public void byteBufferDirectWrite() {
        directBuffer.put(5, value);
    }
    @Group("get")
    @Benchmark
    public int heapGet() {
       return array[5];
    }
    @Group("get")
    @Benchmark
    public int byteBufferGet() {
        return buffer.get(5);
    }
    @Group("get")
    @Benchmark
    public int byteBufferDirectGet() {
       return directBuffer.get(5);
    }
}

Benchmark Mode Cnt Score Error Units
HeapVsByteBuffer.get thrpt 15 0,833 ± 0,041 ops/ns
HeapVsByteBuffer.get:byteBufferDirectGet thrpt 15 0,279 ± 0,014 ops/ns
HeapVsByteBuffer.get:byteBufferGet thrpt 15 0,235 ± 0,012 ops/ns
HeapVsByteBuffer.get:heapGet thrpt 15 0,319 ± 0,015 ops/ns
HeapVsByteBuffer.write thrpt 15 1,414 ± 0,202 ops/ns
HeapVsByteBuffer.write:byteBufferDirectWrite thrpt 15 0,087 ± 0,016 ops/ns
HeapVsByteBuffer.write:byteBufferWrite thrpt 15 0,368 ± 0,176 ops/ns
HeapVsByteBuffer.write:heapWrite thrpt 15 0,958 ± 0,106 ops/ns