This document describes the use of the NTP Project’s calc_tickadj
program.
This document applies to version 4.2.8p14 of calc_tickadj
.
• calc_tickadj Description: | Description | |
• calc_tickadj Invocation: | Invoking calc_tickadj |
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The calc_tickadj
script uses provided ntp drift file to generate optimal
tick value. Generally, ntpd can do better job if the drift value is the
smallest possible number.
The example output of
$ ./calc_tickadj 81.699 (drift) 9999 usec; 9999779 nsec $ cat /etc/ntp/drift -23.159
means the following. If tick on that box is 10,000, by making the value 9999 we’ll shift the box from its current drift of -23.159 to a drift of 81.699, and in doing so we’ll speed the clock up a little every second instead of slowing the clock down a little.
If ’tick’ on that box is 10,000,000 then by setting it to 9999779 the drift value will be somewhere around 0.0.
calc_tickadj
tries to determine the the tick value by using
tickadj
program from ntp package. If this doesn’t work you can specify
current tick manually on command line.
This section was generated by AutoGen,
using the agtexi-cmd
template and the option descriptions for the calc_tickadj
program.
• calc_tickadj usage: | calc_tickadj help/usage (--help) | |
• calc_tickadj drift-file: | drift-file option (-d) | |
• calc_tickadj tick: | tick option (-t) | |
• calc_tickadj exit status: | exit status |
Next: calc_tickadj drift-file, Up: calc_tickadj Invocation
This is the automatically generated usage text for calc_tickadj.
The text printed is the same whether selected with the help
option
(--help) or the more-help
option (--more-help). more-help
will print
the usage text by passing it through a pager program.
more-help
is disabled on platforms without a working
fork(2)
function. The PAGER
environment variable is
used to select the program, defaulting to more. Both will exit
with a status code of 0.
calc_tickadj - Calculates "optimal" value for tick given ntp drift file. - Ver. 4.2.8p13 USAGE: calc_tickadj [ -<flag> [<val>] | --<name>[{=| }<val>] ]... -d, --drift-file=str Ntp drift file to use -t, --tick=num Tick value of this host -?, --help Display usage information and exit --more-help Pass the extended usage text through a pager Options are specified by doubled hyphens and their name or by a single hyphen and the flag character.
• calc_tickadj drift-file: | ||
• calc_tickadj tick: | ||
• calc_tickadj exit status: |
Next: calc_tickadj tick, Previous: calc_tickadj usage, Up: calc_tickadj usage
This is the “ntp drift file to use” option. This option takes a string argument. Use the specified drift file for calculations
Next: calc_tickadj exit status, Previous: calc_tickadj drift-file, Up: calc_tickadj usage
This is the “tick value of this host” option. This option takes a number argument. The current tick which to adjustment will be calculated
Previous: calc_tickadj tick, Up: calc_tickadj usage
One of the following exit values will be returned:
Successful program execution.
The operation failed or the command syntax was not valid.