This is a prototype of the dynamic node sizing for Openshift. Click here for more information about the proposed enhancement in Openshift.
This script will be executed as ExecStartPre by the systemd unit of the kubelet. The script will generate the recommended node sizing values for system reserved memory and cpus.
Sample output for various values of memory and cpus,
$ ./dynamic-node-sizing.sh true
Memory in Gibi 1, SYSTEM_RESERVED_MEMORY=0.25Gi
Memory in Gibi 2, SYSTEM_RESERVED_MEMORY=0.5Gi
Memory in Gibi 4, SYSTEM_RESERVED_MEMORY=1Gi
Memory in Gibi 8, SYSTEM_RESERVED_MEMORY=1.8Gi
Memory in Gibi 16, SYSTEM_RESERVED_MEMORY=2.6Gi
Memory in Gibi 32, SYSTEM_RESERVED_MEMORY=3.56Gi
Memory in Gibi 64, SYSTEM_RESERVED_MEMORY=5.48Gi
Memory in Gibi 128, SYSTEM_RESERVED_MEMORY=9.32Gi
Memory in Gibi 256, SYSTEM_RESERVED_MEMORY=11.88Gi
Memory in Gibi 512, SYSTEM_RESERVED_MEMORY=17Gi
Memory in Gibi 1024, SYSTEM_RESERVED_MEMORY=27.24Gi
CPU Count 1, SYSTEM_RESERVED_CPU=0.06
CPU Count 2, SYSTEM_RESERVED_CPU=0.07
CPU Count 4, SYSTEM_RESERVED_CPU=0.10
CPU Count 8, SYSTEM_RESERVED_CPU=0.14
CPU Count 16, SYSTEM_RESERVED_CPU=0.24
CPU Count 32, SYSTEM_RESERVED_CPU=0.43
CPU Count 64, SYSTEM_RESERVED_CPU=0.82
CPU Count 128, SYSTEM_RESERVED_CPU=1.58
CPU Count 256, SYSTEM_RESERVED_CPU=3.12
CPU Count 512, SYSTEM_RESERVED_CPU=6.19