java-lock-bench

This project is to benchmark some concurrency control features of Java.

What types of benchmarks?

The following types of benchmarks are included in the project.

• Counter
  • 100%: increment (read-modify-write) operation
  • These Java classes or features are used
    • java.util.concurrent.atomic.AtomicLong
    • java.util.concurrent.locks.ReentrantLock
    • java.util.concurrent.locks.ReentrantReadWriteLock
    • java.util.concurrent.Semaphore
    • java.util.concurrent.locks.StampedLock
    • synchronized keyword (intrinsic lock)
• Map
  • 20%: Read-modify-write operation
  • 80%: Read-only operation
  • These Java classes or features are used
    • java.util.concurrent.ConcurrentMap
    • java.util.concurrent.locks.ReentrantLock
    • java.util.concurrent.locks.ReentrantReadWriteLock
    • java.util.concurrent.Semaphore
    • java.util.concurrent.locks.StampedLock
      • java.util.concurrent.locks.StampedLock#writeLock() is used for read-only operation
      • java.util.concurrent.locks.StampedLock#tryOptimisticRead() is used for read-only operation
    • synchronized keyword (intrinsic lock)

How to run the benchmark

Execute this command to run the Counter benchmarks

./gradlew counter:jmh

Execute this command to run the Map benchmarks

./gradlew map:jmh

Execute this command to run all the benchmarks

./gradlew jmh

Benchmark results on Linux using Java 8, 11, 17 and 21

For the Counter benchmarks

For the Map benchmarks