Benchmark keeps running

[Yann Le Tallec]

Hello,

I am probably missing something obvious but the bechmark below only works
with one thread. When using 2 or more threads, it gets stuck during the
first warmup iteration.

@OutputTimeUnit(TimeUnit.NANOSECONDS)
public class CAS {

    @State(Scope.Benchmark)
    public static class AIState {
        private final AtomicInteger ai = new AtomicInteger();
    }

    @GenerateMicroBenchmark(BenchmarkType.AverageTimePerOp)
    public int cas(CAS.AIState state) {
        int i = state.ai.get();
        while (!state.ai.compareAndSet(i, i + 1)) { }
        return state.ai.get();
    }
}

I run it with: java -jar microbenchmarks.jar ".*CAS.*" -wi 5 -w 200ms -i 5
-r 200ms -t 1
(and -t 2 for 2 threads respectively).

Many thanks,
Yann