Swap Memory Management

12/01/2025

Why use Swap Memory?

Swap allows the system to use disk space as virtual RAM when physical memory is fully used, helping handle memory-intensive tasks and preventing system crashes. Howver, swap i slower than RAM due to disk access speeds.

Good Swap Size practices

A general rule is to set swap memory to TWICE the size of your RAM. For example:

512MB RAM -> 1GB swap
1GB RAM -> 2GB swap
4GB RAM -> 8GB swap

Managing Swap on Linux

Disable current Swap
```
sudo dphys-swapfile swapoff
```
Open the Swap file
```
sudo nano /etc/dphys-swapfile
```
Locate the line below and modify it to the desired size (in MB):
```
CONF_SWAPSIZE=1024 # Example for 1GB Swap
```
Recreate the Swap file
```
sudo dphys-swapfile setup
```
Re-enable Swap
```
sudo dphys-swapfile swapon
```
Option, but recommended - Reboot
```
sudo reboot
```
Verify the Swap with monitoring tools like htop
```
htop
```

Conclusion

Proper swap memory management helps your Linux system handle resource-intensive tasks more efficiently. While swap can improve performance, finding the right balance is key to avoiding slowdowns or unnecessary storage wear. By optimizing swap settings, you ensure better system stability, responsiveness, and longevity.