禁用透明大页面(THP)

Create the init.d script.

Create the following file at /etc/init.d/disable-transparent-hugepages :

#!/bin/bash
### BEGIN INIT INFO
# Provides:          disable-transparent-hugepages
# Required-Start:    $local_fs
# Required-Stop:
# X-Start-Before:    mongod mongodb-mms-automation-agent
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Disable Linux transparent huge pages
# Description:       Disable Linux transparent huge pages, to improve
#                    database performance.
### END INIT INFO

case $1 in
  start)
    if [ -d /sys/kernel/mm/transparent_hugepage ]; then
      thp_path=/sys/kernel/mm/transparent_hugepage
    elif [ -d /sys/kernel/mm/redhat_transparent_hugepage ]; then
      thp_path=/sys/kernel/mm/redhat_transparent_hugepage
    else
      return 0
    fi

    echo 'never' | tee ${thp_path}/enabled > /dev/null

    unset thp_path
    ;;
esac

echo 'never' | tee ${thp_path}/defrag > /dev/null

Make it executable.

Run the following command to make the script executable:

sudo chmod 755 /etc/init.d/disable-transparent-hugepages

Run the script.

Run the script manually once to ensure that the appropriate THP setting has been changed:

sudo /etc/init.d/disable-transparent-hugepages start

Verify that THP has successfully been set to [never] by running the following command:

cat /sys/kernel/mm/transparent_hugepage/enabled

On Red Hat Enterprise Linux and potentially other Red Hat-based derivatives, you may instead need to use the following:

cat /sys/kernel/mm/redhat_transparent_hugepage/enabled

Configure your operating system to run it on boot.

To ensure that this setting is applied each time your system boots, run the following command for your Linux distribution:

Customize tuned / ktune profile, if applicable.

If you are using tuned or ktune on RHEL/ CentOS, you must now also create a custom tuned profile.