MyBenchmark.java

/*
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package org.sample;

import com.carrotsearch.hppc.IntIntHashMap;
import com.graphhopper.storage.DataAccess;
import com.graphhopper.storage.Directory;
import com.graphhopper.storage.MMapDirectory;
import com.graphhopper.storage.RAMDirectory;
import org.openjdk.jmh.annotations.*;

import java.util.Random;

import static java.util.concurrent.TimeUnit.SECONDS;

@State(Scope.Benchmark)
@Warmup(iterations = 3, time = 5, timeUnit = SECONDS)
@Measurement(iterations = 5, time = 5, timeUnit = SECONDS)
@Fork(1)
public class MyBenchmark {

    static int N = 200_000_000;

    @State(Scope.Thread)
    public static class DAState {
        Random r = new Random(0);
        DataAccess da;

        public DAState() {
            System.out.println("alloc da mem");
            Directory ramDirectory = new RAMDirectory();
            da = ramDirectory.find("da");
            da.create(N * 4);
            for (int j = 0; j < N; j++) {
                da.setInt(j * 4, r.nextInt(N));
            }
        }
    }

    @Benchmark
    public int testDA(DAState state) {
        return state.da.getInt(state.r.nextInt(N) * 4);
    }

    @State(Scope.Thread)
    public static class MDAState {
        DataAccess mda;
        Random r = new Random(0);

        public MDAState() {
            System.out.println("alloc mda mem");
            Directory ramDirectory = new MMapDirectory("/tmp/test");
            mda = ramDirectory.find("da");
            mda.create(N * 4);
            for (int j = 0; j < N; j++) {
                mda.setInt(j * 4, r.nextInt(N));
            }
        }
    }

    @Benchmark
    public int testMDA(MDAState state) {
        return state.mda.getInt(state.r.nextInt(N) * 4);
    }

    @State(Scope.Thread)
    public static class ArrayState {
        int[] array = new int[N];
        Random r = new Random(0);

        public ArrayState() {
            System.out.println("alloc array mem");
            for (int j = 0; j < N; j++) {
                array[j] = r.nextInt(N);
            }
        }
    }

    @Benchmark
    public int testArray(ArrayState state) {
        return state.array[state.r.nextInt(N)];
    }

    @State(Scope.Thread)
    public static class MapState {
        IntIntHashMap map = new IntIntHashMap(N);
        Random r = new Random(0);

        public MapState() {
            System.out.println("alloc map mem");
            for (int j = 0; j < N; j++) {
                int i = r.nextInt(N);
                map.put(j, i);
            }
        }
    }

    @Benchmark
    public int testMap(MapState state) {
        return state.map.get(state.r.nextInt(N));
    }

//    @Benchmark
//    public int testNothing() {
//        return accessRand.nextInt(N);
//    }
}