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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.
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