A quick map access benchmark

I got a 10K entries big hash map and have 1k threads to traverse the map.

Single thread
Erlang ETS 3+ seconds
Java HashMap 0.18 seconds
Java ConcurrentHashMap 0.41 seconds
High-scale lib NonBlockingHashMap 0.43 seconds

1000 threads
Erlang ETS 2+ seconds
Java HashMap N/A (not thread-safe)
Java ConcurrentHashMap 0.56 seconds
High-scale lib NonBlockingHashMap 0.51 seconds