bw_tcp hostname [transfersize]
bw_tcp has three forms of usage: as a server (-s), as a client (bw_tcp localhost), and as a shutdown (bw_tcp -localhost).
The default amount of data is 3MB. The client form may specify a different amount of data. Specifications may end with ``k'' or ``m'' to mean kilobytes (* 1024) or megabytes (* 1024 * 1024).
"Socket bandwidth using %s: %0.2f MB/sec\\n", hostname, megabytes_per_second, i.e.,
Socket bandwidth using localhost: 2.32 MB/sec