tinuously

SYNOPSIS

       clockspeed

DESCRIPTION

       clockspeed resets the local UNIX clock every three seconds
according to
       (1) an internal hardware tick counter and  (2)  occasional
real-time mea-
       surements from a reliable source.

       clockspeed   reads   the   real-time   measurements   from

/usr/local/clock-

       speed/adjust.  Each real-time  measurement   must   be   a
single  16-byte
       packet,  expressed as a TAI64NA time adjustment to the lo-
cal UNIX clock.

       clockspeed does not place any limits on the possible   ad-
justments.   It
       is  your responsibility to make sure that the measurements
are reliable.

       After two real-time measurements,  clockspeed  can  figure
out the  number
       of   real   attoseconds per tick.  It saves this number in
TAI64NA format
       in       /usr/local/clockspeed/etc/atto,       overwriting

/usr/local/clock-

       speed/etc/atto.tmp     for     reliability.     It   reads

/usr/local/clock-

       speed/etc/atto when it starts up again.

       clockspeed must be run by root.

SEE ALSO

       clockadd(1), clockview(1), sntpclock(1), taiclock(1), adj-
time(2),  get-
       timeofday(2)



                                                                 clock-
speed(1)