On 5 October 2017 at 14:52, Fred Smith <fredex@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

good luck!

Fred
>
> On Thu, 5 Oct 2017 13:05:27 -0400 Sam Varshavchik <mrsam@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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