Re: [chrony-users] chrony-top

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On Thu, May 27, 2021 at 11:39:48PM -0400, Marc Compere wrote:
> Can someone try this out and let me know if it works? It works on Ubuntu
> 20.04.2 quite well and reports something similar to the attached screenshot:
> [image: chrony_top_screenshot.png]
> It must be run as sudo or root, so make sure you read the script before
> executing. It's simple and short. It makes a folder in /tmp to save output
> from `chronyc -nc clients`.

Interesting, thanks for posting.

I tried it on one of my servers which is logging 512k clients at the
same time and the script was a bit too heavy on the CPU. It takes a
long time to fetch all the clients and then sort them.

In recent chrony versions the clients command has the -r option to
reset the counters and the -p option to select clients that has at
least some number of accesses. Together, they can make an efficient
top-like utility, e.g.:


#reset counters
chronyc -n clients -r -p -1 > /dev/null

while true; do
	sleep 1
	chronyc -c clients -r -p 1 | \
		awk -F , '{ printf "%40s\t%d\n", $1, $2 }' | \
		sort -n -r -k 2 | \
		head -n 20

The obvious drawback is that it's constantly resetting all the
counters, so there must be nothing else using them.

Miroslav Lichvar

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