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- .\" $Id$
- .TH LAT_TCP 8 "$Date$" "(c)1994 Larry McVoy" "LMBENCH"
- .SH NAME
- lat_tcp \- measure interprocess communication latency via TCP/IP
- .SH SYNOPSIS
- .B lat_tcp
- .I -s
- .sp .5
- .B lat_tcp
- .I hostname
- .sp .5
- .B lat_tcp
- .I -hostname
- .SH DESCRIPTION
- .B lat_tcp
- is a client/server program that measures 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.
- .PP
- .B lat_tcp
- has three forms of usage: as a server (lat_tcp -s),
- as a client (lat_tcp localhost), and
- as a shutdown (lat_tcp -localhost).
- .SH OUTPUT
- The reported time is in microseconds per round trip and includes the total
- time, i.e., the context switching overhead is included.
- Output format is like so
- .sp
- .ft CB
- TCP latency using localhost: 700 microseconds
- .ft
- .SH ACKNOWLEDGEMENT
- Funding for the development of
- this tool was provided by Sun Microsystems Computer Corporation.
- .SH "SEE ALSO"
- lmbench(8), read(2), write(2), socket(2), bind(2), connect(2).
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