CPU spikes

[CodeAnthem]

Is there an existing issue for this?

• I have searched the existing issues
• And it has nothing to do with Traefik

Describe the bug

I noticed cpu spikes on one of my VM machines, and figured with: docker stats --format "table {{.Name}}t{{.CPUPerc}}t{{.MemUsage}}" that like every 5-10 seconds error-pages the cpu usage spikes to 8-16% while my other containers chill at ~1%.

traefikt0.00%t24.01MiB / 1.929GiB
error-pagest17.05%t2.922MiB / 1.929GiB
adguardhomet0.02%t45.77MiB / 1.929GiB
portainert0.00%t8.27MiB / 1.929GiB
dozzlet0.00%t13.95MiB / 1.929GiB
sp_watchtowert0.02%t2.418MiB / 1.929GiB
apachet0.01%t5.945MiB / 1.929GiB
sp_traefikt0.01%t9.016MiB / 1.929GiB
autheliat0.00%t21.08MiB / 1.929GiB
sp_portainert0.01%t2.32MiB / 1.929GiB
whoamit0.00%t1MiB / 1.929GiB
traefik-bouncert0.00%t18.5MiB / 1.929GiB

honestly no idea why, I closed all http/s connections to the server and still had this issue.

Steps to reproduce

No response

Configuration files

error-pages:
    <<: *common-keys-alwaysup # See EXTENSION FIELDS at the top
    image: tarampampam/error-pages:2.20.0 # Using the latest tag is highly discouraged. Please, use tags in X.Y.Z format
    container_name: error-pages
    command:
      - "--log-level=error"      
      - "serve"
    networks:
      - traefik
    volumes:
      - ${APPDATA_DIR:?err}/error-pages/mytemplates:/opt/templates:ro # my templates
    environment:
      # TEMPLATE_PATH: /mytemplates/matrix.html
      TEMPLATE_NAME: matrix # set the error pages template
      SHOW_DETAILS: true
    labels:
      traefik.enable: true
      traefik.http.services.error-pages.loadbalancer.server.port: 8080
      com.centurylinklabs.watchtower.monitor-only: true

Relevant log output

No response

Anything else?

maybe you can tell me, what could cause this

thanks a lot and I really like this project

[tarampampam]

Oh, thanks for your issue! How can I reproduce this locally?

[CodeAnthem]

Oh, thanks for your issue! How can I reproduce this locally?

well I don't know, I even reduced my containers to a bare minimum and still notice the same. doesn't it spike on your server?
Atm, I excluded it of my core containers running on every hosts, because I got few hosts having poor performance, even tho I would like to have it everywhere.

[tarampampam]

Yea, from time to time I test the performance and resource usage, and all looks ok. In addition, I have tested that right now:

Spikes that you can see (1..3%% of one core) is ok for go-based application, it looks like a GC is working, and templates in-memory cache cleaning.

Should I dig deeper?

[CodeAnthem]

does GC kick in like every 5 seconds? I think its a bit strange, that it has spikes, while 0 connections are active, like apache is 100% idle, traefik has a little activity, but its nothing comparable to error-pages spiking to 8-16% every ~5 seconds. Am Fr., 24. Feb. 2023 um 08:37 Uhr schrieb Paramtamtam < ***@***.***>:

…

Yea, from time to time I test the performance and resource usage, and all looks ok. In addition, I have tested that right now: [image: Screenshot at 2023-02-24 11-30-30] <https://user-images.githubusercontent.com/7326800/221118700-59f21697-9432-445c-8fc4-627725b4dcb1.png> Spikes that you can see is ok for go-based application, it looks like a GC working and templates in-memory cache cleaning <https://github.com/tarampampam/error-pages/blob/36673a49a4a2a0e6548046fa814fbc3c1eeef2b8/internal/tpl/render.go#L95-L106> . Should I dig deeper? — Reply to this email directly, view it on GitHub <#175 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOKTZV7OOELBURWQLBVWXXDWZBQL3ANCNFSM6AAAAAAU3UI4XU> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[tarampampam]

Okay, I'll research this case deeper, stay tuned

[CodeAnthem]

Awesome. Thanks :) Am Fr., 24. Feb. 2023 um 11:25 Uhr schrieb Paramtamtam < ***@***.***>:

…

Okay, I'll research this case deeper, stay tuned — Reply to this email directly, view it on GitHub <#175 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOKTZV34Y5GCB66NYJ64Y2LWZCECNANCNFSM6AAAAAAU3UI4XU> . You are receiving this because you authored the thread.Message ID: ***@***.***>