Linux CPU Hotplug in VMware

Prerequisites:

• CPU Hotplug is activated: VMware: Edit Settings -> Options -> Memory/CPU Hotplug -> CPU Hotplug
• Note: You can only add CPU sockets. If you have configured more e.g. 4 cores per socket you can only add cores in steps of 4

Adding CPUs:

• Raise the assigned sockets in the settings
• Activate the added cores with the script below

cd /sys/devices/system/cpu
for i in cpu*/online
do
  if [ "`cat $i`" = "0" ]
  then
    echo 1 > $i
  fi
done

Alexander Worlitschek

IT Enthusiast with focus on linux, vmware, container technologies