Using async write I/O wouldn't allow them to test the capabilities of the underlying hardware as writes would return immediately. Also, sixty threads on such a

Using async write I/O wouldn't allow them to test the capabilities of the underlying hardware as writes would return immediately. Also, sixty threads on such a powerful machine is not really a big deal. Even though 0.06ms service time seems small, it is large enough such that you won't have more than a handful of threads competing for CPU resources (they'd waiting for some I/O completion)