xxhash-benchmark.java

package viossat.benchmark;

import net.jpountz.xxhash.XXHash32;
import net.jpountz.xxhash.XXHash64;
import net.jpountz.xxhash.XXHashFactory;
import net.openhft.hashing.LongHashFunction;

import java.security.MessageDigest;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Main {
    public static void main(String[] args) throws Exception {
        int n = 1_000_000;
        int packetSize = 1653;

        Random random = new Random();
        List<byte[]> packets = new ArrayList<>(n);
        for (int i = 0; i < n; i++) {
            byte[] packet = new byte[packetSize];
            random.nextBytes(packet);
            packets.add(packet);
        }

        int seed = random.nextInt();
        MessageDigest sha256 = MessageDigest.getInstance("SHA-256");
        XXHash32 xxHash1 = XXHashFactory.fastestInstance().hash32();
        XXHash64 xxHash2 = XXHashFactory.fastestInstance().hash64();
        LongHashFunction xxHash3 = LongHashFunction.xx();

        long t1 = System.currentTimeMillis();

        packets.forEach(packet -> {
            sha256.digest(packet);
        });

        long t2 = System.currentTimeMillis();

        packets.forEach(packet -> {
            xxHash1.hash(packet, 0, packet.length, seed);
        });

        long t3 = System.currentTimeMillis();

        packets.forEach(packet -> {
            xxHash2.hash(packet, 0, packet.length, seed);
        });

        long t4 = System.currentTimeMillis();

        packets.forEach(packet -> {
            xxHash3.hashBytes(packet);
        });

        long t5 = System.currentTimeMillis();

        System.out.println("java.security.MessageDigest (SHA-256) -> " + (t2 - t1));
        System.out.println("net.jpountz.xxhash.XXHash32 -> " + (t3 - t2));
        System.out.println("net.jpountz.xxhash.XXHash64 -> " + (t4 - t3));
        System.out.println("net.openhft.hashing.LongHashFunction -> " + (t5 - t4));
    }
}