Perfomance - input don't use interrupts

[helmutacp]

With Bullseye RPi.GPIO is used. With Bookworm it uses rpi-lgpio and lgpio.
lgpio no longer uses interrupts for inputs. This means some cpu seconds for every input.
The official gpiod still uses interrupts. This means zero cpu when monitoring inputs.
Is there a chance to change the underline library?

By the way pigpiod is also polling the imputs ...

[dceejay]

There is already a node that uses gpiod - https://flows.nodered.org/node/node-red-node-pi-gpiod

[helmutacp]

Unfortunately, this is a little confusing. There is a library gpiod (https://pypi.org/project/gpiod/) and a daemon gpiod ore Remote GPIO: https://gpiozero.readthedocs.io/en/stable/remote_gpio.html
Unfortunately, both have the same name...
node-red-node-pi-gpiod uses the daemon and not the library. Unfortunately, the daemon does not support interrupts and therefore polls with a certain percentage of CPU

[dceejay]

To use the library I think you have (or certainly used to have to) run as root... and we don't want to have to run Node-RED as root so was not easily possible - hence the use of the daemon. If that has changed recently that would be good but yes will need someone with time to help re-write the node.

[helmutacp]

I think it should work as user without root rigts. I did a short python program and it worked as normal user.