A JMH benchmark comparing the throughput of synchronized vs ReentrantLock

ReentrantLockVsSynchronized.java

package concurrent;

/**
 * java -jar target\benchmarks.jar concurrent -t N -wi 10 -i 20 -rf csv -tu ms -si true
 */

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

@State(Scope.Benchmark)
public class ReentrantLockVsSynchronized {

    @Param({"ReentrantLock", "Synchronized"})
    private String lockMode;

    @State(Scope.Benchmark)
    public static class Counter {
        private static long value;
    }

    @State(Scope.Benchmark)
    public static class JvmLock {
        private static Object lock = new Object();
    }

    @State(Scope.Benchmark)
    public static class RLock {
        private static Lock lock = new ReentrantLock();
    }

    @Benchmark
    public void measure(JvmLock jvmLock, RLock rLock, Counter counter) {
        switch (lockMode) {
            case "Synchronized":
                doSynchronized(jvmLock, counter);
            case "ReentrantLock":
                doReentrantLock(rLock, counter);
        }
    }

    public void doReentrantLock(RLock rLock, Counter counter) {
        rLock.lock.lock();
        try {
            Counter.value++;
        } finally {
            rLock.lock.unlock();
        }
    }

    public void doSynchronized(JvmLock jvmLock, Counter counter) {
        synchronized (jvmLock.lock) {
            Counter.value++;
        }
    }
}