How Do I Check Whether a Pod Is Bound with CPU Cores?

Take a node with 4 vCPUs and 8 GiB memory as an example. Deploy a workload whose CPU request is 1 and limit is 2 in the cluster in advance.

1. Log in to a node in the node pool and view the /var/lib/kubelet/cpu_manager_state output.

   cat /var/lib/kubelet/cpu_manager_state

   Information similar to the following will be displayed:

   {"policyName":"static","defaultCpuSet":"0,2-3","entries":{"c1fcd22d-8a83-4aef-a27a-4c037e482b16":{"container-1":"1"}},"checksum":1500530529}

   If the value of policyName is static, the policy has been configured.

2. Check the cgroup setting of cpuset.preferred_cpus of the container. The output is the ID of the CPU that is preferentially used.

   cat /sys/fs/cgroup/cpuset/kubepods/pod {pod uid} / {Container id} /cpuset.cpus

   • {pod uid} indicates the pod UID. It can be obtained by running the following command on the host that has been connected to the cluster using kubectl:

     kubectl get po {pod name} -n {namespace} -ojsonpath='{.metadata.uid}{"\n"}'

     In the preceding command, {pod name} indicates the pod name and {namespace} indicates the namespace to which the pod belongs.

   • {Container id} must be a complete container ID. To obtain the ID, run the following command on the node where the container is running:
     Docker node pool: In the command, {pod name} indicates the pod name.

     docker ps --no-trunc | grep {pod name} | grep -v cce-pause | awk '{print $1}'

     containerd node pool: In the command, {pod name} indicates the pod name, {pod id} indicates the pod ID, and {container name} indicates the container name.

     # Obtain the pod ID.
     crictl pods | grep {pod name} | awk '{print $1}'
     # Obtain the complete container ID.
     crictl ps --no-trunc | grep {pod id} | grep {container name} | awk '{print $1}'

   A complete example is as follows:

   cat /sys/fs/cgroup/cpuset/kubepods/podc1fcd22d-8a83-4aef-a27a-4c037e482b16/5cb15f55f429e4496172bef05994477caa96e0ca468563208695c1ad5cc141e0/cpuset.cpus

   The command output shows that CPU 1 is bound.

   1