stdin memory leak

[aviator_11]

Thank you very much for all your advice and insight, I agree. I need to be very aware of memory usage in the functionality I choose to use, especially with strings. Circuitpython must have been releasing memory without me realizing it. And when I introduced a second thread in micropython, the increasing usage of available memory eventually caused the second thread to crash, so the problem became more obvious.

[Roberthh]

The intended memory handling of MicroPyhton and CircuitPython are identical. MicroPython will also automatically release memory when needed. So no action is required unless you want to optimize you timing.

[aviator_11]

Do you have any suggestions on good ways to pre-allocate memory for strings or release memory used for string functions? Or is the best method to gc.collect() after I'm done decoding into a string, similar to below?

Code: Select all

import sys
import gc

b = bytearray(1)

def read():
        sys.stdin.readinto(b)
        return b.decode('ascii')

while True:
        read()
        #gc.collect() 
        print (gc.mem_free())

[Roberthh]

Please do not panic about memory handling. Unless you run into a real problem, like allocation exceptions, let the memory manager do it's work.

[scruss]

As an aside:

Code: Select all

        return b.decode('ascii')

decodes to UTF-8. That's all that MicroPython understands. The argument string is currently ignored