https://stackoverflow.com/questions/21524477/python-memory-leak
"So here is what I have found out:
the py-spidev module (or some part of spidev itself) seems to be the problem.
besides the memory leak, py-spidev is incredibly slow
I've now got rid of py-spidev and write to /dev/spidev0.0 directly via file handle. No more excessive memory usage and SPI communication now needs about two seconds, that's about a tenth of the time it needed before." -
answered Feb 3 '14 at 20:14 tungl