On 5 October 2017 at 14:52, Fred Smith <fre...@fcshome.stoneham.ma.us>
wrote:

> On Thu, Oct 05, 2017 at 12:38:19PM -0500, Ranjan Maitra wrote:
> > Thanks!
>
> While it's true that I'm running Centos-7 instead of Fedora, CentOS also
> uses chrony as its default ntp client.
>

With systemd there are 3 options:

systemd-timesyncd -- https://wiki.archlinux.org/index.php/systemd-timesyncd,

supports sntp protocol

ntpd -- original "proof of concept" implementation.  It is widely used, but
for laptops or workstations one of the others may be a better choice

chronyd -- implementaion of the ntp protocol developed for systems with
unreliable network access where ntpd


> On my system "ps ax | grep -i chrony" turns up two processes, chronyd,
> and the grep.
>
> # ps ax | grep -i chrony
>  1113 ?        S      0:02 /usr/sbin/chronyd
>  6982 pts/1    S+     0:00 grep --color=auto -i chrony
>
>
Use "ps ax | grep [c]hrony" to omit the grep process.


> chronyc does not run unless someone starts it, usually from a commandline.
> it is a user tool for examining/controlling chronyd status. it shouldn't
> be running all the time. Do you have a startup script somewhere that is
> running it for you? If so, I'd recommend not doing that.
>

> even if I start it from a command prompt, if I don't give it any commands
> to run it consumes (as faras I can tell by watching top) zero CPU
> (there's bound to be some, but it's just waiting at a command prompt,
> so how much could it be?)
>
> so it sounds like something on your system is running it and feeding it
> some time-consuming commands. your task is to figure out what that is and
> fix it.
>


https://www.reddit.com/r/Fedora/comments/72g5hc/chronyc_tracking_consumes_100_cpu/
sounds similar.  See  RHEL 7 Using chrony
<https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/sect-using_chrony>

>
> good luck!
>
> Fred
> >
> > On Thu, 5 Oct 2017 13:05:27 -0400 Sam Varshavchik <mr...@courier-mta.com>
> wrote:
> >
> > > Ranjan Maitra writes:
> > >
> > > > Over the past few weeks, my laptop has been running chronyc at full
> blast.
> > > >
> > > > $top
> > > >
> > > > 12657 root      20   0   20624   1308   1160 R  93.8  0.0   1739:52
> chronyc
> > > >
> > > > I looked up chronyc and found that this controls NTP. I use NTP, but
> do I
> > > > need to keep this around? Or is the good old ntp good enough? From
> what I
> > > > understand, openntp would also work but that is not available on
> Fedora.
> > > >
> > > > I guess I am wondering if there is a major cost to sudo dnf erase
> chronyc -y.
> > >
> > > The major cost is that if your puter's clock is off, its internal time
> will
> > > slowly drift apart.
> >
> > Will ntpd not address this issue?
> >
> >
> > >
> > > How important is having the system time accurate is to you?
> > >
> >
> > To the extent that I am able to fetchmail from my mail servers for which
> I think we need reasonably accurate system time?
> >
> > I do not get why chronyc should run and create such a racket at 100% CPU.
> >
>

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