RasPi 3B Memory degrading during operation

During normal operation (running is Pi-Hole and sometimes the DV4mini service dv_serial) the free memory is degrading permanently. You can see this on the log of my monitoring routine (http://www.oe1gpa.at/download/radiopi_screen.jpg).
Can anyone give me a hint how to overcome that situation? If the reason can not be found then at least to have a solution for freeingn the dead memory?

My old PasPi 3 is running under Wheezy and has not that problem.
Best regards
Gerald

I have to add I am using Ubuntu Mate 16.04.2 !

At the risk of ignoring the obvious: Have you rebooted the system to see if your “lost” memory gets reinstated? Something you’re running might just be leaking memory.

If you haven’t, and a reboot does reinstate it, and the memory starts shrinking, it will come down to figuring out what it is that’s doing it. Einfach, aber nicht unmöglich. :innocent:

Problem Solved!!!

This routine is also implemented in my monitoring tool:

RadioPimonitor: http://www.oe1gpa.at/download/RadioPimonitor.zip