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TTCP(1)								       TTCP(1)

NAME    [Toc]    [Back]

     ttcp - test TCP and UDP performance

SYNOPSIS    [Toc]    [Back]

     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]

DESCRIPTION    [Toc]    [Back]

     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	buffers	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 systems 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

OPTIONS    [Toc]    [Back]

     -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.

									Page 1

TTCP(1)								       TTCP(1)

     -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.

	       When testing UDP	performance, it	is important to	set the	packet
	       size to be less than or equal to	the maximum transmission unit
	       of the media.  Otherwise, IP fragmentation will distort the
	       test.  For Ethernet, set	the length to 1508 bytes.

     -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 5001).  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	blocks.

     -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 'K'.

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

     -v	       Verbose:	print more statistics.

     -d	       Debug: set the SO_DEBUG socket option.

SEE ALSO    [Toc]    [Back]

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

									PPPPaaaaggggeeee 2222
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