[ntp:questions] NTP vs chrony comparison (Was: oscillations in ntp clock synchronization)

Danny Mayer mayer at ntp.isc.org
Wed Jan 23 05:07:19 UTC 2008

Harlan Stenn wrote:
> Hey Danny!
>>>> In article <2Fqlj.12866$vp3.5778 at edtnps90>, Unruh <unruh-spam at physics.ubc.ca> writes:
> Unruh> Unfortunately I cannot run both ntp and chrony on the same system at
> Unruh> the same time.
> Bill,
> Exactly why can you not run ntpd and chrony on the same system at the same
> time?

Harlan, really. You *cannot* have two different mechanisms/applications 
to discipline the clock at the same time. I invite you to try. You have 
access to my code so you can test this easily.

> I want the ability to run multiple instances of ntpd where at most 1
> instance of ntpd is actually controlling the clock, specifically to make it
> easy to (more quickly) analyze the performance/behavior of different
> configurations of ntpd.  I understand that the boat is rocking while this is
> going on, but I suspect this capability would be a useful one in at least
> some cases.

I don't see the benefit of doing this with two separate instances. It's 
easier and simpler to just add the other servers into the one instance 
and specify noselect.


More information about the questions mailing list