Raspberry Pi computers may not always have the best amount of RAM available. For small embedded applications, this is just perfect, no precious ram wasted by remaining empty.
However, depending on the application, more memory might be required. The fallback would be virtual memory. In big server installations, swap is not even a topic. However, if an SD-card is were the files live on, SWAP is somewhat out of the picture.
If CPU power is not an issue, ZRAM might be a solution of the RAM-shortage of an RPi-application.
While my RPi500 has plenty of RAM, I installed ZRAM anyways.
This is what my present memory situation looks like:
total used free shared buff/cache available
Mem: 8131616 835544 6173708 103560 1315828 7296072
Swap: 4270584 0 4270584
