bionic (8) lat_rpc.8.gz

NAME

       lat_rpc - measure interprocess communication latency via Sun RPC

SYNOPSIS

       lat_rpc -s
       lat_rpc [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] [ -p tcp|udp ] hostname [ udp|tcp ]
       lat_rpc -S hostname

DESCRIPTION

       lat_rpc  is  a  client/server  program that measures interprocess communication latencies.  The benchmark
       passes a token 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.

       This  benchmark may be compared to the TCP and UDP forms of the same benchmark to accurately see the cost
       of using RPC versus the cost of using plain old TCP or UDP sockets.  It is worth noting that the RPC form
       is passing back and forth a single byte, not some long complicated record.

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

       The client form may specify the protocol over which the RPCs are performed.  The default  is  to  measure
       performance for both udp and tcp.

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

       RPC/udp latency using localhost: 1344 microseconds
       RPC/tcp latency using localhost: 2089 microseconds

ACKNOWLEDGEMENT

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

SEE ALSO

       lmbench(8).

AUTHOR

       Carl Staelin and Larry McVoy

       Comments, suggestions, and bug reports are always welcome.

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