Howto speed up Yocto build

How to speed up Yocto build

Build performance tuning for OE/Yocto

• Recommended free disk space: about 100 Gbytes
• Put the build directory on its own disk. This is good practice in its own right since the build system has a tendency to wear disks heavily.
• Use the ext4 filesystem for the build disk
• Turn off journaling for ext4 (“$ tune2fs -O ^has_journal <disk>")
• Mount using the options "noatime,barrier=0,commit=6000"
• Use a tmpfs for /tmp

Example of /etc/fstab

# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
UUID=/dev/sda1  /               ext4    noatime,barrier=0,commit=6000,errors=remount-ro 0       1
UUID=/dev/sda5  none            swap    sw              0       0
/dev/ram0       /tmp            tmpfs   size=1G         0       0