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TTCP(1) 										  TTCP(1)

       ttcp - test TCP and UDP performance

       ttcp  -t  [-u]  [-s]  [-p port]	[-l buflen] [-b size] [-n numbufs] [-A align] [-O offset]
       [-f format] [-D] [-v] host [<in]
       ttcp -r [-u] [-s] [-p port] [-l buflen] [-b size] [-A align] [-O offset] [-f format]  [-B]
       [-T] [-v] [>out]

       Ttcp times the transmission and reception of data between two systems using the UDP or TCP
       protocols.  It differs from common ``blast'' tests, which tend to measure the remote inetd
       as  much  as  the  network performance, and which usually do not allow measurements at the
       remote end of a UDP transmission.

       For testing, the transmitter should be started with -t and -s after the receiver has  been
       started	with  -r and -s.  Tests lasting at least tens of seconds should be used to obtain
       accurate measurements.  Graphical presentations of throughput versus buffer size for  buf-
       fers ranging from tens of bytes to several ``pages'' can illuminate bottlenecks.

       Ttcp  can also be used as a ``network pipe'' for moving directory hierarchies between sys-
       tems when routing problems exist or when the use of other mechanisms is	undesirable.  For
       example, on the destination machine, use: ttcp -r -B | tar xvpf -

       and on the source machine: tar cf - directory | ttcp -t dest_machine

       Additional intermediate machines can be included by: ttcp -r | ttcp -t next_machine

       -t	 Transmit mode.

       -r	 Receive mode.

       -u	 Use UDP instead of TCP.

       -s	 If  transmitting, source a data pattern to network; if receiving, sink (discard)
		 the data.  Without the -s option, the default is to transmit data from stdin  or
		 print the received data to stdout.

       -l length Length of buffers in bytes (default 8192).  For UDP, this value is the number of
		 data bytes in each packet.  The system limits the  maximum  UDP  packet  length.
		 This limit can be changed with the -b option.

       -b size	 Set  size  of	socket	buffer.   The default varies from system to system.  This
		 parameter affects the maximum UDP packet length.  It may not be possible to  set
		 this parameter on some systems (for example, 4.2BSD).

       -n numbufs
		 Number of source buffers transmitted (default 2048).

       -p port	 Port  number to send to or listen on (default 2000).  On some systems, this port
		 may be allocated to another network daemon.

       -D	 If transmitting using TCP, do not buffer data when sending (sets the TCP_NODELAY
		 socket  option).   It	may not be possible to set this parameter on some systems
		 (for example, 4.2BSD).

       -B	 When receiving data, output only full blocks, using the block size specified  by
		 -l.   This  option is useful for programs, such as tar(1), that require complete

       -A align  Align the start of buffers to this modulus (default 16384).

       -O offset Align the start of buffers to this offset (default 0).   For  example,  ``-A8192
		 -O1'' causes buffers to start at the second byte of an 8192-byte page.

       -f format Specify,  using  one  of  the following characters, the format of the throughput
		 rates	as  kilobits/sec  ('k'),   kilobytes/sec   ('K'),   megabits/sec   ('m'),
		 megabytes/sec ('M'), gigabits/sec ('g'), or gigabytes/sec ('G').  The default is

       -T	 ``Touch'' the data as they are read in order to measure cache effects.

       -v	 Verbose: print more statistics.

       -d	 Debug: set the SO_DEBUG socket option.

       ping(1M), traceroute(1M), netsnoop(1M)

					      local					  TTCP(1)
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