uses non-blocking socket I/O to contact as many hosts as possible in
parallel, so it is very efficient. The keys from a domain of 1,000
hosts can be collected in tens of seconds, even when some of those
uses non-blocking socket I/O to contact as many hosts as possible in
parallel, so it is very efficient. The keys from a domain of 1,000
hosts can be collected in tens of seconds, even when some of those