Rotate Raspberry Pi 3 output display to potrait

How to rotate Raspberry Pi 3 output display to Potrait.

1. Edit /boot/config.txt
    # nano /boot/config.txt
  
    Add the following line to the bottom of the line
    display_rotate_1         <= this is to rotate the display output to 90 degrees

    Ctrl + X and type Y    <= to save the updated file

2. Allocate more memory to the GPU from 64M to 128M
    # sudo raspi-config

    In Raspberry Pi Software Configuration Tool, select Advanced Options.
    Select "A3 Memory Split" change it from 64 to 128.
    Press Tab and select <Ok>