Measuring memory footprint of EdgeCore

Why measuring memory footprint

  • This platform is also tagged for a light weighted edge computing deployment
  • To be able to be deployed over devices with less resources (for example, 256MB RAM)
  • It is required to know by deploying as many as possible pods, it showcases as much as less possible memory footprint

KPI’s measured

  • %CPU
  • %Memory
  • Resident Set Size (RSS)

How to test

After deployment and provisioning of KubeEdge cloud and edge components in 2 VM’s (supported and tested over Ubuntu 16.04) respectively, start deploying pods from 0 to 100 in steps of 5. Keep capturing above KPI’s using standard linux ps commands, after each step.

Test setup

../_images/perftestsetup_diagram.PNGKubeEdge Test Setup

Fig 1: KubeEdge Test Setup

Creating a setup

Requirements

  • Host machine’s or VM’s resource requirements can mirror the edge device of your choice
  • Resources used for above setup are 4 CPU, 8GB RAM and 200 GB Disk space. OS is Ubuntu 16.04.
  • Docker image used to deploy the pods in edge, needs to be created. The steps are:
    1. Go to github.com/kubeedge/kubeedge/edge/hack/memfootprint-test/
    2. Using the Dockerfile available here and create docker image (perftestimg:v1).
    3. Execute the docker command sudo docker build --tag "perftestimg:v1" ., to get the image.

Installation

  • For KubeEdge Cloud and Edge:

    Please follow steps mentioned in KubeEdge README.md

  • For docker image:

  • Deploy docker registry to either edge on any VM or host which is reachable to edge. Follow the steps mentioned here: https://docs.docker.com/registry/deploying/
  • Create perftestimg:v1 docker image on the above mentioned host
  • Then push this image to docker registry using docker tag and docker push commands (Refer: Same docker registry url mentioned above) [Use this image’s metadata in pod deployment yaml]

Steps

  1. Check edge node is connected to cloud. In cloud console/terminal, execute the below command
root@ubuntu:~/edge/pod_yamls# kubectl get nodes
NAME                                   STATUS     ROLES    AGE     VERSION
192.168.20.31                          Unknown    <none>   11s
ubuntu                                 NotReady   master   5m22s   v1.14.0
  1. On cloud, modify deployment yaml (github.com/kubeedge/kubeedge/edge/hack/memfootprint-test/perftestimg.yaml), set the image name and set spec.replica as 5
  2. Execute sudo kubectl create -f ./perftestimg.yaml to deploy the first of 5 pods in edge node
  3. Execute sudo kubectl get pods | grep Running | wc to check if all the pods come to Running state. Once all pods come to running state, go to edge VM
  4. On Edge console, execute ps -aux | grep edge_core. The output shall be something like:
USER        PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root     102452  1.0  0.5 871704 42784 pts/0    Sl+  17:56   0:00 ./edge_core
root     102779  0.0  0.0  14224   936 pts/2    S+   17:56   0:00 grep --color=auto edge
  1. Collect %CPU, %MEM and RSS from respective columns and record
  2. Repeat step 2 and this time increase the replica by 5
  3. This time execute sudo kubectl apply -f <PATH>/perftestimg.yaml
  4. Repeat steps from 4 to 6.
  5. Now repeat steps from 7 to 9, till the replica count reaches 100