Unable to obtain continuous perf data

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1

Environment

OS：CentOS-7.6-4.14.0-115.el7a.0.1.aarch64
Netdata：v1.31.0-242-gb0b0fbd

Problem/Question

I use the perf.plugins and want to collect all the data every second. It works very well when I do nothing. But when I run some big large programs and CPU fully loaded, it seems netdata can not get continuous data. Cannot see continuous lines but intermittent line on the dashboard. ( I want to upload the photo of dashboard here but always fail. )
I get this in error.log.

2022-01-05 18:13:34: netdata ERROR : PLUGIN[proc] : heartbeat missed 6790000 monotonic microseconds
2022-01-05 18:13:40: netdata ERROR : PLUGIN[proc] : heartbeat missed 4090000 monotonic microseconds
2022-01-05 18:13:43: netdata ERROR : PLUGIN[proc] : heartbeat missed 1890000 monotonic microseconds
2022-01-05 18:13:43: perf.plugin ERROR : MAIN : heartbeat missed 6980000 monotonic microseconds
2022-01-05 18:13:44: netdata ERROR : MAIN : EXPORTING: '150.1.68.201:10121' closed the socket
2022-01-05 18:13:50: perf.plugin ERROR : MAIN : heartbeat missed 6000000 monotonic microseconds
2022-01-05 18:13:52: netdata ERROR : PLUGIN[proc] : heartbeat missed 8010000 monotonic microseconds
2022-01-05 18:13:57: netdata ERROR : PLUGIN[proc] : heartbeat missed 3990000 monotonic microseconds
2022-01-05 18:13:58: netdata ERROR : MAIN : EXPORTING: '150.1.68.201:10121' closed the socket
2022-01-05 18:13:59: perf.plugin ERROR : MAIN : heartbeat missed 7610000 monotonic microseconds
2022-01-05 18:14:05: perf.plugin ERROR : MAIN : heartbeat missed 4650000 monotonic microseconds
2022-01-05 18:14:06: netdata ERROR : PLUGIN[proc] : heartbeat missed 8070000 monotonic microseconds

By the way, I already set netdata.conf.

[global]
process scheduling policy = rr
process scheduling priority = 99

What I expected to happen

So how can I solve this problem?
Thanks.

2

Do you see gaps in all the charts or just for the perf plugin?

3

Yes, I see gaps in all the charts.
I change the priority of netdata in netdata.conf, it didn’t work. But I change the priority in netdata.service, it works.
Thanks for your reply.

4

Here is the link to the GitHub issue.

As we discussed on GitHub: it is expected behavior and is documented.

I brought up this topic internally and we discussed it within the team, we decided to keep the settings as they are.