lat_tcp - measure interprocess communication latency via TCP/IP
lat_tcp -s
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 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).
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) , lat_unix(8) .
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.