lat_pipe - measure interprocess communication latency through pipes
lat_pipe [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ]
lat_pipe uses two processes communicating through a Unix pipe to
measure 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.
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
Pipe latency: 491 microseconds
Funding for the development of this tool was provided by Sun
Microsystems Computer Corporation.
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.
(c)1994 Larry McVoy $Date$