Install dmidecode and lshw:
sudo pacman -Syu dmidecode lshw
Check installed RAM modules with:
sudo dmidecode -t 16
sudo lshw -class memory
To check memory usage of all programs run htop:
htop
Shortcuts:
Search for a process with specific name: F4
Send a kill signal to process: F9 (press it twice and then Enter)
Quit htop: q
Check a memory usage of a process with process ID 6606 (you can list multiple ID's as well):
sudo pmap 6606
To extract only total memory usage which is printed at the end:
sudo pmap 6606 | tail -n 1
Create 8GB swap file (the same size as your RAM):
fallocate -l 8G /swapfile
Change its access rules, format and enable it:
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
Also, add this Swap file to the /etc/fstab:
echo '/swapfile none swap sw 0 0' >> /etc/fstab
How to Increase Swap Size in Ubuntu Linux https://linuxhandbook.com/increase-swap-ubuntu/
I'll do this to increase my swap file form 8 GB to 16 GB - I need this to compile python-graph-tool from AUR, which otherwise fills my 8 GB RAM and 8 GB swap file!
This is fairly easy, does not require reboot, only that you have enough free RAM memory to accomodate any leftover stuff in your swap.
Check your current swap:
swapon --show
Turn off you swapfile (make sure you have enough free RAM memory to acocmodate any leftover stuff from your swap):
sudo swapoff /swapfile
Allocate new swap space, I will go for 16GB here:
sudo fallocate -l 16GB /swapfile
Mark it as a swapfile (you will be warned that your old swap signature is wiped off):
sudo mkswap /swapfile
Finally, enable the swap file:
sudo swapon /swapfile
You can check that your swap really increased with swapon --show or free -h commands.