chronyc keeps on running

[Ranjan Maitra]

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. 

Thanks,
Ranjan


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[Sam Varshavchik]

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.

How important is having the system time accurate is to you?

[Ranjan Maitra]

Thanks!

On Thu, 5 Oct 2017 13:05:27 -0400 Sam Varshavchik <mrsam(a)courier-mta.com&gt; 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.

Thanks again!

Ranjan




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[Fred Smith]

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.

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

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.

good luck!

Fred
>  
>  On Thu, 5 Oct 2017 13:05:27 -0400 Sam Varshavchik <mrsam(a)courier-mta.com&gt; 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.
>  
>  Thanks again!
>  
>  Ranjan
>  
>  
>  
>  
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-- 
---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us -----------------------------
  "And he will be called Wonderful Counselor, Mighty God, Everlasting Father,
  Prince of Peace. Of the increase of his government there will be no end. He 
 will reign on David's throne and over his kingdom, establishing and upholding
      it with justice and righteousness from that time on and forever."
------------------------------- Isaiah 9:7 (niv) ------------------------------

[George N. White III]

On 5 October 2017 at 14:52, Fred Smith <fredex(a)fcshome.stoneham.ma.us&gt;
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...
sounds similar.  See  RHEL 7 Using chrony
<https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/...

>  good luck!
>
>  Fred
>  >
>  > On Thu, 5 Oct 2017 13:05:27 -0400 Sam Varshavchik <mrsam(a)courier-mta.com&gt;
>  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.
>  >
>  
[...]

[Sam Varshavchik]

Ranjan Maitra writes:

>  > > 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? 
ntpd is a viable alternative.

>  > 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? 
fetchmail itself doesn't care.

Downloaded mail will likely report the local time in the received: header,  
that's about it.

>  I do not get why chronyc should run and create such a racket at 100%
> CPU. 
Only strace can tell.