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spray sends a one-way stream of packets to host using RPC, and reports how many were received, as well as the transfer rate. The host
argument can be either a name or an Internet address.
spray is not useful as a networking benchmark, as it uses unreliable connectionless transports, UDP for example. spray can report a large number of packets dropped
when the drops were caused by spray sending packets faster than they can be buffered locally, that is, before the packets get to the network medium.
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