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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