UnitializedArrayBenchmark Class — netty Architecture

Source Code

microbench/src/main/java/io/netty/microbench/internal/UnitializedArrayBenchmark.java lines 35–73

@Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(2)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Benchmark)
public class UnitializedArrayBenchmark extends AbstractMicrobenchmark {

    @Param({ "1", "10", "100", "1000", "10000", "100000" })
    private int size;

    @Setup(Level.Trial)
    public void setupTrial() {
        if (PlatformDependent.javaVersion() < 9) {
            throw new IllegalStateException("Needs Java9");
        }
        if (!PlatformDependent.hasUnsafe()) {
            throw new IllegalStateException("Needs Unsafe");
        }
    }

    @Override
    protected String[] jvmArgs() {
        // Ensure we minimize the GC overhead for this benchmark and also open up required package.
        // See also https://shipilev.net/jvm-anatomy-park/7-initialization-costs/
        return new String[] { "-XX:+UseParallelOldGC", "-Xmx8g", "-Xms8g",
                "-Xmn6g", "--add-opens", "java.base/jdk.internal.misc=ALL-UNNAMED" };
    }

    @Benchmark
    public byte[] allocateInitializedByteArray() {
        return new byte[size];
    }

    @Benchmark
    public byte[] allocateUninitializedByteArray() {
        return PlatformDependent.allocateUninitializedArray(size);
    }
}