bw_tcp man page on DragonFly

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BW_TCP(1)			    LMBENCH			     BW_TCP(1)

NAME
       bw_tcp - time data movement through TCP/IP sockets

SYNOPSIS
       bw_tcp  [ -m <message size> ] [ -M <total bytes> ] [ -P <parallelism> ]
       [ -W <warmups> ] [ -N <repetitions> ] server
       bw_tcp -s
       bw_tcp -S <server>

DESCRIPTION
       bw_tcp is a client/server program that moves data over a TCP/IP socket.
       Nothing	is  done  with the data on either side; total bytes of data is
       moved in message size chunks.

       bw_tcp has three forms of usage: as a server (-s), as a client  (bw_tcp
       localhost), and as a shutdown (bw_tcp -S localhost).

       The default amount of data is 10MB.  The client form may specify a dif‐
       ferent amount of data.  Specifications may end with ``k'' or  ``m''  to
       mean kilobytes (* 1024) or megabytes (* 1024 * 1024).

OUTPUT
       Output format is Socket bandwidth using localhost: 2.32 MB/sec

MEMORY UTILIZATION
       This  benchmark	can  move  up  to  six	times the requested memory per
       process when run through the loopback device.  There are two processes,
       the   sender  and  the  receiver.   Most	 Unix  systems	implement  the
       read/write system calls as a bcopy from/to kernel  space	 to/from  user
       space.  Bcopy will use 2-3 times as much memory bandwidth: there is one
       read from the source and a write to the destionation.  The  write  usu‐
       ally  results  in  a cache line read and then a write back of the cache
       line at some later point.  Memory utilization might be reduced  by  1/3
       if  the processor architecture implemented "load cache line" and "store
       cache line" instructions (as well as getcachelinesize).

ACKNOWLEDGEMENT
       Funding for the development of this tool was provided by Sun  Microsys‐
       tems Computer Corporation and Silicon Graphics, Inc.

SEE ALSO
       lmbench(8).

AUTHOR
       Carl Staelin and Larry McVoy

       Comments, suggestions, and bug reports are always welcome.

(c)1994 Larry McVoy		    $Date$			     BW_TCP(1)
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