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Introduction

Yocto builds often compile large components such as LLVM, which require significant memory. Builds may fail with out-of-memory (OOM) errors if sufficient RAM or swap is not available. This section describes methods to increase available system memory and improve build stability.

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Increase Swap Space

If your build fails due to OOM errors, increase the swap space to at least 32 GB (recommended: 64 GB). Run the following commands to resize the swap file 
sudo su root
swapon --show
swapoff /swapfile
fallocate -l 64G /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
free -h

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Increase zram

You can also increase compressed in-memory swap (zram) to improve memory usage efficiency 
modprobe zram
zramctl /dev/zram0 --algorithm zstd --size "$(($(grep -Po 'MemTotal:\s*\K\d+' /proc/meminfo)/2))KiB"
mkswap -U clear /dev/zram0
swapon --discard --priority 100 /dev/zram0