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.