How can I effectively test the performance of Java concurrent collections?

How can I effectively test the performance of Java concurrent collections?

To test the performance of Java concurrent collections, you can use benchmarking tools like JMH (Java Microbenchmark Harness). It allows you to measure the performance of your code accurately.

What specific metrics should I focus on during the performance tests?

Focus on metrics like throughput, latency, and contention. Throughput measures how many operations can be performed in a given time, while latency measures the time taken for a single operation.

Can you give me an example of a simple benchmark using JMH?

Sure! Here's a simple example:

@Benchmark
public void testConcurrentHashMap() {
    ConcurrentHashMap<Integer, String> map = new ConcurrentHashMap<>();
    map.put(1, "one");
}

Are there any common pitfalls to avoid when testing?

Yes, avoid measuring in a non-isolated environment, as other processes can affect your results. Also, ensure warm-up iterations are included to get accurate measurements.