package jdk.test;

/* Results on Linux / i7-4771

9-ea+106:

Benchmark                             Mode  Cnt  Score   Error  Units
DirectBufferAllocBench06.alloc1M_t1   avgt   10  0.212 ± 0.022  ms/op
DirectBufferAllocBench06.alloc1M_t4   avgt   10  0.586 ± 0.017  ms/op
DirectBufferAllocBench06.alloc1M_t16  avgt   10  2.458 ± 0.066  ms/op

patched:

Benchmark                             Mode  Cnt  Score   Error  Units
DirectBufferAllocBench06.alloc1M_t1   avgt   10  0.150 ± 0.006  ms/op
DirectBufferAllocBench06.alloc1M_t4   avgt   10  0.586 ± 0.011  ms/op
DirectBufferAllocBench06.alloc1M_t16  avgt   10  2.294 ± 0.040  ms/op

*/


import org.openjdk.jmh.annotations.*;

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

@BenchmarkMode(Mode.AverageTime)
@Warmup(iterations = 5)
@Measurement(iterations = 10)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@Fork(value = 1, jvmArgs = "-XX:MaxDirectMemorySize=128m")
@State(Scope.Thread)
public class DirectBufferAllocBench06 {

    @Benchmark
    @Threads(1)
    public ByteBuffer alloc1M_t1() {
        return ByteBuffer.allocateDirect(1024 * 1024);
    }

    @Benchmark
    @Threads(4)
    public ByteBuffer alloc1M_t4() {
        return ByteBuffer.allocateDirect(1024 * 1024);
    }

    @Benchmark
    @Threads(16)
    public ByteBuffer alloc1M_t16() {
        return ByteBuffer.allocateDirect(1024 * 1024);
    }
}