[BUG] Using 66% of a CPU when idle

[ohmantics]

Environment

Self-Hosted (Docker)

System

Ubuntu 22.0.4

Version

2.1.1

Describe the problem

With no browser windows taking to dashy, the "node server" process is using 66% of a CPU core at minimum. Presumably this is background processing such as the docker healthcheck. There's no rebuild running. It's not going to zero at any point. With any browser window open, it goes up to 125% and stays there or above. However, this all seems very excessive for what's logically happening.

This was a straight-forward docker install using Portainer on a Raspberry Pi 4 running Ubuntu 22.04. This is enough CPU use to trigger the cooling fan on this box, hence why I've noticed it.

Additional info

partial output of pstree -a -p:

  ├─containerd-shim,654085 -namespace moby -id fcfa6e2acda69da0fbd4ca458e75243f3b7b4563f64322e231e6566505c71980 -address /run/containerd/containerd.sock
  │   ├─tini,654108 -- yarn build-and-start
  │   │   └─node,654156 /opt/yarn-v1.22.15/bin/yarn.js build-and-start
  │   │       ├─node,654179 /app/node_modules/.bin/npm-run-all --parallel build-watch start
  │   │       │   ├─node,654190 /opt/yarn-v1.22.15/bin/yarn.js run build-watch
  │   │       │   │   ├─node,654212 /app/node_modules/.bin/vue-cli-service build --watch --mode production
  │   │       │   │   │   ├─{node},654214
  │   │       │   │   │   ├─{node},654215
  │   │       │   │   │   ├─{node},654216
  │   │       │   │   │   ├─{node},654217
  │   │       │   │   │   ├─{node},654218
  │   │       │   │   │   ├─{node},654224
  │   │       │   │   │   ├─{node},654232
  │   │       │   │   │   ├─{node},654233
  │   │       │   │   │   ├─{node},654234
  │   │       │   │   │   └─{node},654235
  │   │       │   │   ├─{node},654192
  │   │       │   │   ├─{node},654193
  │   │       │   │   ├─{node},654194
  │   │       │   │   ├─{node},654195
  │   │       │   │   ├─{node},654196
  │   │       │   │   ├─{node},654202
  │   │       │   │   ├─{node},654204
  │   │       │   │   ├─{node},654205
  │   │       │   │   ├─{node},654206
  │   │       │   │   └─{node},654207
  │   │       │   ├─node,654191 /opt/yarn-v1.22.15/bin/yarn.js run start
  │   │       │   │   ├─node,654213 server
  │   │       │   │   │   ├─{node},654219
  │   │       │   │   │   ├─{node},654220
  │   │       │   │   │   ├─{node},654221
  │   │       │   │   │   ├─{node},654222
  │   │       │   │   │   ├─{node},654223
  │   │       │   │   │   ├─{node},654225
  │   │       │   │   │   ├─{node},654226
  │   │       │   │   │   ├─{node},654227
  │   │       │   │   │   ├─{node},654228
  │   │       │   │   │   └─{node},654229
  │   │       │   │   ├─{node},654197
  │   │       │   │   ├─{node},654198
  │   │       │   │   ├─{node},654199
  │   │       │   │   ├─{node},654200
  │   │       │   │   ├─{node},654201
  │   │       │   │   ├─{node},654203
  │   │       │   │   ├─{node},654208
  │   │       │   │   ├─{node},654209
  │   │       │   │   ├─{node},654210
  │   │       │   │   └─{node},654211
  │   │       │   ├─{node},654180
  │   │       │   ├─{node},654181
  │   │       │   ├─{node},654182
  │   │       │   ├─{node},654183
  │   │       │   ├─{node},654184
  │   │       │   ├─{node},654185
  │   │       │   ├─{node},654186
  │   │       │   ├─{node},654187
  │   │       │   ├─{node},654188
  │   │       │   └─{node},654189
  │   │       ├─{node},654167
  │   │       ├─{node},654168
  │   │       ├─{node},654169
  │   │       ├─{node},654170
  │   │       ├─{node},654171
  │   │       ├─{node},654172
  │   │       ├─{node},654175
  │   │       ├─{node},654176
  │   │       ├─{node},654177
  │   │       └─{node},654178
  │   ├─{containerd-shim},654086
  │   ├─{containerd-shim},654087
  │   ├─{containerd-shim},654088
  │   ├─{containerd-shim},654089
  │   ├─{containerd-shim},654090
  │   ├─{containerd-shim},654091
  │   ├─{containerd-shim},654092
  │   ├─{containerd-shim},654093
  │   ├─{containerd-shim},654094
  │   ├─{containerd-shim},654375
  │   └─{containerd-shim},657704

Please tick the boxes

• You have explained the issue clearly, and included all relevant info
• You are using a supported version of Dashy
• You've checked that this issue hasn't already been raised
• You've checked the docs and troubleshooting guide
• You agree to the code of conduct

[bdovaz]

Same problem here... I'm about to look for an alternative because my raspberry freezes and I have to restart it.

[JohnnieDK]

I had the same problem, so I built a new docker image from master, and that sort of seems to have fixed it.
However, I also noticed that when I had the status check enabled, it would interfere with my pi-alert container (Note that pi-alert is VERY buggy). And both would consume a lot of cpu.

[ohmantics]

Still relevant. @Lissy93, any chance you'll be able to look at this? If not, perhaps you have some hints as to how you'd diagnose it?

[Lissy93]

Hey,
Really sorry for the delay in replying, (I have so many unread GH notifications at the moment, that it's hard to spot the important ones! 😬)

This definitely doesn't sound good at all, weirdly I'm running a very similar setup (Pi 4, default Docker, etc) and no issues.
Looking at those logs, I'm wondering if it's something gone wrong with the healthcheck. If you disable that, do you still see issues?

[adamantike]

@ohmantics, do you have an example config file to reproduce this issue? Also, does it still happen if you change the container command to run yarn start instead?

@Lissy93, is there any reason for the ARM-based Docker images to have yarn build-and-start as default CMD, while the Docker image for x86 is just yarn start?

[CrazyWolf13]

I also run Dashy with many other things on my Rpi 3B+ with 1GB RAM and Dashy is consuming very few MB and barely any CPU even when starting up.

Can you confirm if you are running x64 or x32 ?

[bdovaz]

In my case x64

[CrazyWolf13]

@bdovaz @ohmantics

Hi
Could you test this with the :latest tag by repulling and rebuilding the app?

Keep in mind V3 has breaking changes:
https://github.com/Lissy93/dashy/releases/tag/3.0.0

[ohmantics]

Not seeing the original issue now. It did take several re-pulls for the build to complete without errors; not sure why since it says "possible error, check logs" and there are no logs to see.

[CrazyWolf13]

Not seeing the original issue now. It did take several re-pulls for the build to complete without errors; not sure why since it says "possible error, check logs" and there are no logs to see.

Awesome!

Then I think we can close this.

If you have changed the bind mounts and the port those errors shouldn't appear, yeah.

Did you wait about 3 minutes longer and refreshed the page, after the error appears?
The first build takes a bit longer and on a raspberry pi it takes even longer, so it may exceed the expected time and then the "possible error" popps up.