CompositePixelLookup.java

package richardstartin;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OperationsPerInvocation;
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;
import org.openjdk.jmh.infra.Blackhole;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.stream.IntStream;

@State(Scope.Benchmark)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@BenchmarkMode(Mode.AverageTime)
public class CompositePixelLookup {
    record Pixel(int x, int y) {
    }

    Map<String, Object> concatMap;
    Map<Pixel, Object> pixelMap;

    @Param("1024")
    int width;
    @Param("768")
    int height;

    @Setup(Level.Trial)
    public void setup() {
        concatMap = new HashMap<>();
        pixelMap = new HashMap<>();
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                concatMap.put(x + ";" + y, x * 768 + y);
                pixelMap.put(new Pixel(x, y), x * 768 + y);
            }
        }
    }

    @Benchmark
    @OperationsPerInvocation(786432)
    public void concatenate(Blackhole bh) {
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                bh.consume(concatMap.get(x + ";" + y));
            }
        }
    }

    @Benchmark
    @OperationsPerInvocation(786432)
    public void wrap(Blackhole bh) {
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                bh.consume(pixelMap.get(new Pixel(x, y)));
            }
        }
    }
}