By @cmpxchg16 1%-100% writes samples for LongAdderBench.java:
for 1% writes=16,000 (16 threads * 100,000 ops each=1,600,000):
LongAdder 1.209ms
AtomicLong 0.281ms
AtomicLong faster than LongAdder by 76.77%
for 2% writes=32,000 (16 threads * 100,000 ops each=1,600,000):
LongAdder 2.019ms
AtomicLong 0.485ms