How to disable Transparent Huge Pages (THP) in Ubuntu 16.04LTS

Question

I am setting up an ambari cluster with 3 virtualbox VMs running Ubuntu 16.04LTS. However I get the below warning:

The following hosts have Transparent Huge P         


        

Answer 1

To disable Transparent Huge Pages (THP) permanently:

1. Via GRUB options (preferred):

   Edit /etc/default/grub to add transparent_hugepage=never to the GRUB_CMDLINE_LINUX_DEFAULT option:

   GRUB_CMDLINE_LINUX_DEFAULT="transparent_hugepage=never quiet splash"
   

   After that, run update-grub command. (Need reboot to take effect)

2. With rc.local:

   Edit /etc/rc.local and put following script before exit 0

   if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
      echo never > /sys/kernel/mm/transparent_hugepage/enabled
   fi
   

* To avoid reboot (as mentioned before), you can disable it by # echo never > /sys/kernel/mm/transparent_hugepage/enabled command.