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TTCP(1) USER COMMANDS TTCP(1)
NAME
ttcp - test TCP and UDP performance
SYNOPSIS
ttcp -t [-u] [-s] [-p _p_o_r_t] [-l _b_u_f_l_e_n] [-b _s_i_z_e]
[-n _n_u_m_b_u_f_s] [-A _a_l_i_g_n] [-O _o_f_f_s_e_t] [-f _f_o_r_m_a_t] [-D] [-v]
host [<in]
ttcp -r [-u] [-s] [-p _p_o_r_t] [-l _b_u_f_l_e_n] [-b _s_i_z_e] [-A _a_l_i_g_n]
[-O _o_f_f_s_e_t] [-f _f_o_r_m_a_t] [-B] [-T] [-v] [>out]
DESCRIPTION
_T_t_c_p 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
_i_n_e_t_d 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.
_T_t_c_p 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
-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 _s_t_d_i_n or print the received data to _s_t_d_o_u_t.
-l _l_e_n_g_t_h 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
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TTCP(1) USER COMMANDS TTCP(1)
packet length. This limit can be changed with the
-b option.
-b _s_i_z_e 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 exam-
ple, 4.2BSD).
-n _n_u_m_b_u_f_s
Number of source buffers transmitted (default
2048).
-p _p_o_r_t Port number to send to or listen on (default
2000). On some systems, this port may be allo-
cated 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 _t_a_r(1), that
require complete blocks.
-A _a_l_i_g_n Align the start of buffers to this modulus
(default 16384).
-O _o_f_f_s_e_t 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 _f_o_r_m_a_t 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 effects.
-v Verbose: print more statistics.
-d Debug: set the SO_DEBUG socket option.
SEE ALSO
ping(1M), traceroute(1M), netsnoop(1M)
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