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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                 $Date$