Enabling workload partitioning on Red Hat OpenShift Container Platform

# install-config.yaml
...
cpuPartitioningMode: AllNodes
...

# Note: Ensure $BASE_DIR is set to your working directory
tee $BASE_DIR/data/install/performance-profile.yaml << 'EOF'
---
apiVersion: performance.openshift.io/v2
kind: PerformanceProfile
metadata:
  name: openshift-node-performance-profile
spec:
  cpu:
    # Cores reserved for user workloads
    isolated: "20-23" 
    # Cores reserved for OpenShift system components and the OS
    reserved: "0-19"
  machineConfigPoolSelector:
    pools.operator.machineconfiguration.openshift.io/master: ""
  nodeSelector:
    node-role.kubernetes.io/master: ''
  numa:
    # "restricted" policy enhances CPU affinity
    topologyPolicy: "restricted"
  realTimeKernel:
    enabled: false
  workloadHints:
    realTime: false
    highPowerConsumption: false
    perPodPowerManagement: false
EOF

oc apply -f $BASE_DIR/data/install/performance-profile.yaml

# Find all PIDs for etcd processes
ETCD_PIDS=$(ps -ef | grep "etcd " | grep -v grep | awk '{print $2}')
# Iterate through each PID and check its CPU affinity
for pid in $ETCD_PIDS; do
    echo "----------------------------------------"
    echo "Checking PID: ${pid}"
    
    COMMAND=$(ps -o args= -p "$pid")
    echo "Command: ${COMMAND}"
    
    echo -n "CPU affinity (Cpuset): "
    taskset -c -p "$pid"
done

# Expected Output
----------------------------------------
Checking PID: 4332
Command: etcd --logger=zap ...
CPU affinity (Cpuset): pid 4332's current affinity list: 0-19
----------------------------------------
Checking PID: 4369
Command: etcd grpc-proxy start ...
CPU affinity (Cpuset): pid 4369's current affinity list: 0-19