[Twisted-Python] a question about monotonic clock

[gelin yan]

On Sun, Oct 28, 2012 at 8:28 PM, <exarkun at twistedmatrix.com> wrote:

> On 05:57 am, dynamicgl at gmail.com wrote:
> >Hi All
> >
> >    I am quite concerned the ticket 2424 due to our system use
> >reactor.callLater almost anywhere. I know this issue is hard to be
> >finxed
> >otherwise It wouldn't exist for such a long time. So any work around
> >before
> >we getting fix it? The only way I can do is to disable NTP or stop
> >process,
> >sync the time manually and then restart the process. The latter way is
> >hard
> >to be accepted due to we have many machines.
>
> NTP does not cause problems with scheduling.  NTP gradually slews the
> system clock - it does not introduce discontinuities (either forward or
> backward), it changes the rate at which time passes until the system
> clock agrees with the external clock.
>
> If you have systems configured to have their system clocks jump
> (`ntpdate` is sometimes used for this), fix them to not be configured
> this way.
>
> #2424 is primarily about user-initiated events, primarily on desktop
> machines - a user changing the system time, a user suspending the
> machine (and later unsuspending it).  There's little or no reason for
> problems related to #2424 to ever come up on a properly maintained
> server.
>
> Jean-Paul
>
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Hi Jean-Paul

    Thanks for your answer. It is much clearer from now.

Regards

gelin yan
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