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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  communi-
       cation  latencies.   The	 benchmark passes a message back and forth be-
       tween the two processes (this sort of benchmark is frequently  referred
       to  as  a ``hot potato''	benchmark).  No	other work is done in the pro-
       cesses.

       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 Microsys-
       tems 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)

NAME | SYNOPSIS | DESCRIPTION | OUTPUT | ACKNOWLEDGEMENT | SEE ALSO | AUTHOR

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