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LAT_TCP(8)                          LMBENCH                         LAT_TCP(8)


NAME

       lat_tcp - measure interprocess communication latency via TCP/IP


SYNOPSIS

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


DESCRIPTION

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


OUTPUT

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

       TCP latency using localhost: 700 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_udp(8),
       lat_unix(8).


AUTHOR

       Carl Staelin and Larry McVoy

       Comments, suggestions, and bug reports are always welcome.

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

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