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LAT_UDP(8) LMBENCH LAT_UDP(8)

lat_udp - measure interprocess communication latency via UDP/IP

lat_udp -s

lat_udp [ -m <message size> ] [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] hostname

lat_udp -S hostname

lat_udp is a client/server program that measures interprocess communication latencies. The benchmark passes a message back and forth between the two processes (this sort of benchmark is frequently referred to as a ``hot potato'' benchmark). No other work is done in the processes.

lat_udp has three forms of usage: as a server (-s), as a client (lat_udp localhost), and as a shutdown (lat_udp -S localhost).

The reported time is in microseconds per round trip and includes the total time, i.e., the context switching overhead is included. Output format is like so

UDP latency using localhost: 650 microseconds

Funding for the development of this tool was provided by Sun Microsystems Computer Corporation.

lmbench(8), lat_fcntl(8), lat_fifo(8), lat_tcp(8), lat_unix(8).

Carl Staelin and Larry McVoy

Comments, suggestions, and bug reports are always welcome.

$Date$ (c)1994 Larry McVoy

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