lat_tcp - measure interprocess communication latency via TCP/IP
lat_tcp [ -m <message size> ] [ -P <parallelism> ] [ -W <warmups> ] [
-N <repetitions> ] hostname
lat_tcp -S hostname
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
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).
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
Funding for the development of this tool was provided by Sun
Microsystems Computer Corporation.
lmbench(8), lat_fcntl(8), lat_fifo(8), lat_tcp(8), lat_udp(8),
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.
(c)1994 Larry McVoy $Date$