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  3. CPU usage breakdown?

CPU usage breakdown?

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cpugraphscontabo
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  • ruihildtR Offline
    ruihildtR Offline
    ruihildt
    wrote on last edited by girish
    #1

    Is there a way to view which app is CPU intensive?

    Since 2 days, CPU has gone from 40-50% to 80% on average. But right now, I have a hard time pinpointing the guilty apps.

    1 Reply Last reply
    4
    • nebulonN Away
      nebulonN Away
      nebulon
      Staff
      wrote on last edited by
      #2

      One way is to determine the busy container right now first by using systemd-cgtop. It would would display the docker containers like /docker/003d4ff9290ce4b92223b3bb57195a73fe8a4f5b8e473e74f6e54575e4bdadcb where the uuid then can be grepped for to find the container with

      docker ps --no-trunc | grep 003d4ff9290ce4b92223b3bb57195a73fe8a4f5b8e473e74f6e54575e4bdadcb
      
      ruihildtR 1 Reply Last reply
      1
      • nebulonN nebulon

        One way is to determine the busy container right now first by using systemd-cgtop. It would would display the docker containers like /docker/003d4ff9290ce4b92223b3bb57195a73fe8a4f5b8e473e74f6e54575e4bdadcb where the uuid then can be grepped for to find the container with

        docker ps --no-trunc | grep 003d4ff9290ce4b92223b3bb57195a73fe8a4f5b8e473e74f6e54575e4bdadcb
        
        ruihildtR Offline
        ruihildtR Offline
        ruihildt
        wrote on last edited by ruihildt
        #3

        @nebulon Thanks, I'll do that.

        Is there a way to keep track of that in time or it only works in real time?

        Would it be possible to have it in the same way as we can keep track of ram in each app and in the system page per app, somewhere in the future? I have no idea if that's possible to implement or not. 😄

        1 Reply Last reply
        0
        • rmdesR Offline
          rmdesR Offline
          rmdes
          wrote on last edited by
          #4

          What does it mean ?
          6a0fa665-3ea3-4f8a-9959-0d9a6754bbc3-image.png

          1 Reply Last reply
          0
          • nebulonN Away
            nebulonN Away
            nebulon
            Staff
            wrote on last edited by
            #5

            The output is similar to top or htop, but that tool is aware of cgroups in linux, so it is easier to determine the app based on the container id.

            rmdesR 1 Reply Last reply
            0
            • rmdesR Offline
              rmdesR Offline
              rmdes
              wrote on last edited by
              #6

              Problem is the parts that are using the most CPU are :

              / is using 793-796 % CPU 14.3 Gb MEMORY
              cron.service 300+ % CPU 13 GB MEMORY
              system.slice
              docker.service
              box.service
              user.slice
              containerd.service

              Another problem or discrepancies I'm seeing if I dive into containers themselves is that it seems the containers that are using more CPU, the ones that often comes on top, are not tied to any domain/app in particular.

              if I docker ps a specific container i see on the systemd-cgtop no matter what I try to match them I cannot associate these containers ID to my list of ID-Domains when I type cloudron list

              it's like our box is running more containers than the number of app we have ?
              can a container be on the loose and still running and using resources ?

              It does not make sense I know 😕

              1 Reply Last reply
              0
              • rmdesR Offline
                rmdesR Offline
                rmdes
                wrote on last edited by rmdes
                #7

                I keep having this drop_caches process eating all my CPU

                terminal.png

                I tried to kill this process but no matter the way I choose to terminate/kill it it just keeps going, something is occupying the system,it seems to me, outside of the docker environnement.

                1 Reply Last reply
                0
                • nebulonN nebulon

                  The output is similar to top or htop, but that tool is aware of cgroups in linux, so it is easier to determine the app based on the container id.

                  rmdesR Offline
                  rmdesR Offline
                  rmdes
                  wrote on last edited by
                  #8

                  @nebulon running apps are not the problem, what I see is high CPU usage at the / root level of the box 1b17bca0-95e0-4eec-8b4c-577b5f29a827-image.png

                  1 Reply Last reply
                  0
                  • nebulonN Away
                    nebulonN Away
                    nebulon
                    Staff
                    wrote on last edited by
                    #9

                    Ok this is interesting, according to https://linux-mm.org/Drop_Caches this means the system tries to free up memory pages. And this essentially from time to time.
                    From Cloudron side we do not actively do this at all, so this is likely Ubuntu behavior. If this takes up a lot of cpu and for longer time periods, this may be related to the system I/O performance as such.

                    I have to read up further though, for example is this is swap related and then it will indeed be painful if the swap is on some slow disk.

                    1 Reply Last reply
                    1
                    • rmdesR Offline
                      rmdesR Offline
                      rmdes
                      wrote on last edited by rmdes
                      #10

                      After last reboot,the process is now gone and CPU is more stable, quite crazy how this process completely freeze the cloudron box, Swap is being used at 338M over 4GB available and seem to increase very slowly, CPU is now around 50% more or less, still with Highs of 89%

                      i guess it will be better when on Ubuntu 20.x ? and moving to a new VPS or VDS soon probably 🙂

                      1 Reply Last reply
                      0
                      • nebulonN Away
                        nebulonN Away
                        nebulon
                        Staff
                        wrote on last edited by
                        #11

                        Not sure if Ubuntu 20.04 will change anything here, this seems to be a pretty normal thing since a long time for linux distros.

                        Also this may not indicate that you need more main memory or so, it might simply mean that the process of discarding and finding those resources takes long on your system. Thus my concern about system I/O speeds.

                        Which VPS provider are you currently using and is this an SSD system?

                        rmdesR 1 Reply Last reply
                        0
                        • nebulonN nebulon

                          Not sure if Ubuntu 20.04 will change anything here, this seems to be a pretty normal thing since a long time for linux distros.

                          Also this may not indicate that you need more main memory or so, it might simply mean that the process of discarding and finding those resources takes long on your system. Thus my concern about system I/O speeds.

                          Which VPS provider are you currently using and is this an SSD system?

                          rmdesR Offline
                          rmdesR Offline
                          rmdes
                          wrote on last edited by
                          #12

                          @nebulon This is the VPS specs I'm using : https://contabo.com/?show=configurator&vserver_id=237
                          8 CPU cores
                          30 GB RAM (guaranteed)
                          800 GB disk space (100% SSD)
                          100% SSD disk space

                          1 Reply Last reply
                          0
                          • nebulonN Away
                            nebulonN Away
                            nebulon
                            Staff
                            wrote on last edited by
                            #13

                            This looks ok and good enough to me. I am always a bit unsure about disk I/O measurements and also if this is the root cause here at all, but anyways maybe you can do some sanity check with hdparm -t /dev/vda1 (replace /dev/vda1 with you main disk partition)

                            It should be somewhere above 500MB/s at least on provider with SSD in my experience.

                            1 Reply Last reply
                            2
                            • ruihildtR Offline
                              ruihildtR Offline
                              ruihildt
                              wrote on last edited by ruihildt
                              #14

                              FYI, CPU usage is now stable and around 13%, more or less since Contabo did, and I quote their email, a "technical adjustement".

                              You can clearly see on that monthly CPU chart, how it evolved (granted it's early days, but still):

                              89046ec8-7334-4c16-89cf-8504a749fb92-image.png

                              Not only this, but the dashboard now loads nearly instantly whereas beforehand, it could take up to 30 seconds.

                              Taking into account previous random issues with cheaper Contabo VPS in the past, I tend to think the issue was from Contabo from the start.

                              robiR 1 Reply Last reply
                              4
                              • ruihildtR ruihildt

                                FYI, CPU usage is now stable and around 13%, more or less since Contabo did, and I quote their email, a "technical adjustement".

                                You can clearly see on that monthly CPU chart, how it evolved (granted it's early days, but still):

                                89046ec8-7334-4c16-89cf-8504a749fb92-image.png

                                Not only this, but the dashboard now loads nearly instantly whereas beforehand, it could take up to 30 seconds.

                                Taking into account previous random issues with cheaper Contabo VPS in the past, I tend to think the issue was from Contabo from the start.

                                robiR Offline
                                robiR Offline
                                robi
                                wrote on last edited by
                                #15

                                @ruihildt
                                nice to see it resolved outside of Cloudron.

                                If you want a similarly sized and less expensive system, I can share an invite link for ssd nodes that's been working well for us.

                                Conscious tech

                                ruihildtR 1 Reply Last reply
                                2
                                • robiR robi

                                  @ruihildt
                                  nice to see it resolved outside of Cloudron.

                                  If you want a similarly sized and less expensive system, I can share an invite link for ssd nodes that's been working well for us.

                                  ruihildtR Offline
                                  ruihildtR Offline
                                  ruihildt
                                  wrote on last edited by
                                  #16

                                  @robi Yes please. 🙂

                                  I also think next time I encounter a stability issue, I'll explore the provider angle sooner, maybe by replicating it elsewhere the same stack.

                                  1 Reply Last reply
                                  1
                                  • P Offline
                                    P Offline
                                    p44
                                    translator
                                    wrote on last edited by
                                    #17

                                    Hello all, I've a similar problem and I want to ask you what can be the source causes coming from provider.

                                    I'm running a Cloudron instance on a bare metal machine on Hetzner, and I get constantly CPU under 40-50%.

                                    Let me know if I have to open a new post or keep continuing on this.

                                    nebulonN 1 Reply Last reply
                                    0
                                    • P p44

                                      Hello all, I've a similar problem and I want to ask you what can be the source causes coming from provider.

                                      I'm running a Cloudron instance on a bare metal machine on Hetzner, and I get constantly CPU under 40-50%.

                                      Let me know if I have to open a new post or keep continuing on this.

                                      nebulonN Away
                                      nebulonN Away
                                      nebulon
                                      Staff
                                      wrote on last edited by
                                      #18

                                      @p44 is the htop output similar or some other app/process causing the cpu usage?

                                      P 2 Replies Last reply
                                      0
                                      • nebulonN nebulon

                                        @p44 is the htop output similar or some other app/process causing the cpu usage?

                                        P Offline
                                        P Offline
                                        p44
                                        translator
                                        wrote on last edited by
                                        #19

                                        Hello @nebulon,

                                        I did systemd-cgtop and the result is this:

                                        alt text

                                        Then, from Cloudron control panel, the output is this:

                                        alt text

                                        Just few months ago, CPU it was stable to 1-2% in the not working hours time.

                                        Now it seems to be little bit increased, so I was asking myself if this problem was related to Cloudron or to provider (Hetzner).

                                        1 Reply Last reply
                                        0
                                        • J Offline
                                          J Offline
                                          jonslab
                                          wrote on last edited by
                                          #20

                                          5ad45b4d-0d0f-4163-93b6-65aca588f2d4-image.png

                                          I seem to be having a similar issue. None of the apps in cloudron are using enough cpu to even show up here, but I am constantly needing to reboot the cloudron vm to get the cpu usage to drop back down to normal levels.

                                          Not sure if you can tell from the graph, but I've needed to reboot it 3 times in the last month because apps become unresponsive whenever this happens.

                                          htop won't help now because it was just rebooted yesterday and everything seems to be running smoothly.
                                          Does anyone have any suggestions on how to find out why this is happening, or how to find out the cause?

                                          girishG 1 Reply Last reply
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