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LAT_UDP(8)                          LMBENCH                         LAT_UDP(8)


NAME

       lat_udp - measure interprocess communication latency via UDP/IP


SYNOPSIS

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


DESCRIPTION

       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).


OUTPUT

       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


ACKNOWLEDGEMENT

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


SEE ALSO

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


AUTHOR

       Carl Staelin and Larry McVoy

       Comments, suggestions, and bug reports are always welcome.

(c)1994 Larry McVoy                 $Date$                          LAT_UDP(8)

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