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 local UNIX clock.

       clockspeed does not place any limits on the possible  adjustments.   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), adjtime(2),  get-
       timeofday(2)



                                                                 clockspeed(1)