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Full Discussion: Slow FFT in ksh93 and awk.
Operating Systems OS X (Apple) Slow FFT in ksh93 and awk. Post 303023185 by Corona688 on Wednesday 12th of September 2018 06:17:50 PM
Old 09-12-2018
Another thing you can do to speed it up is keep it running - feed it input and read it output at need, rather than starting and killing it all the time. How to do that depends on what your input data would look like and what you'd want for your output data.
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cfspeed(3C)															       cfspeed(3C)

NAME
cfgetospeed(), cfsetospeed(), cfgetispeed(), cfsetispeed() - tty baud rate functions SYNOPSIS
DESCRIPTION
These functions set and get the input and output speed codes in the termios structure referenced by termios_p. The termios structure con- tains these speed codes representing input and output baud rates as well as other terminal related parameters. Setting the parameters on a terminal file does not become effective until is successfully called. returns the output speed code from the termios structure referenced by termios_p. sets the output speed code in the termios structure referenced by termios_p to speed. The speed code for a baud rate of zero, is used to termi- nate the connection. If is specified, the modem control lines are no longer asserted, which normally discon- nects the line. returns the input speed code from the termios structure referenced by termios_p. sets the input speed code in the termios structure referenced by termios_p to speed. RETURN VALUE
returns the output speed code from the termios structure referenced by termios_p. returns the input speed code from the termios structure referenced by termios_p. and return zero upon successful completion. Otherwise, they return -1 and set to indicate the error. ERRORS
and fail when the following condition is encountered: [EINVAL] The value of speed is outside the range of possible speed codes as specified in WARNINGS
and can be used to set speed codes in the termios structure that are not supported by the terminal hardware. SEE ALSO
tcattribute(3C), thread_safety(5), termio(7). STANDARDS CONFORMANCE
cfspeed(3C)
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