Application stops after sevral weeks

[JanBee]

I have 2 apps running 24/7, 1 on a Banana Pi, the other on a laptop running Mint 18.
Both applications stop after a few weeks. The app on the Pi can be restarted, for the other I need to reboot the laptop, otherwise the serial communication with an Arduino does not work anymore.
Anyone an idea?

[marcov]

The reboot thing is most likely not the apps fault, but an OS problem.

As for the BPi thingy, try to find out more about its memory usage. (vmstat/top, maybe running with -gh and/or valgrinding)

[MarkMLl]

First thing is to research whether anybody else has similar problems on the BPi in case some implementation detail of their kernel or standard libraries/daemons is broken.

Second thing is to find out the precise runtime, and to investigate how many milli/micro/seconds etc. that is. The usual thing for this to happen is a rollover, it's particularly pernicious if the timestamp (etc.) is signed but there's a way to write comparisons to minimise the problem.

Assuming Linux on the laptop, the situation where it needs to be rebooted is probably because a USB-connected serial port has moved from e.g. /dev/ttyUSB0 to /dev/ttyUSB1, which suggests that the kernel thinks that the original device hasn't been released cleanly. I'd expect that you could fix that by forcibly-unloading the relevant kernel module.

MarkMLl

[Thaddy]

Simple, you are running out 32 bit resolution.

[JanBee]

Thanks for the suggestions. I'll work on it. May take many weeks before I'll be back