interrupts gives memory leak

I have not experienced this. I use the "Other" PiFace, the one with the RGB LCD Display (16x2) that has 5 buttons on it.  I have not experienced any memory leaks using any of the scripts or any of modified scripts.

Thanks for your input!

I have tested today, and here are the results. First my script:

==========

#!/usr/bin/python

import pifacedigitalio

import time

import MySQLdb

from memory_profiler import profile

@profile

def pulsetodb(pifacedata):

  # Open database connection

  db = MySQLdb.connect('localhost', 'web', '*********', 'domotica', charset='utf8', use_unicode=True)

  # Prepare SQL query to INSERT a record into the database

  sql = "INSERT INTO raw_piface(timestamp, field, status) VALUES( %s , %s , %s )"

  try:

       # Prepare a cursor object using cursor() method

       c = db.cursor()

       # Execute the SQL command

       c.execute(sql, ( pifacedata.timestamp, pifacedata.pin_num, pifacedata.direction ))

       # Commit your changes in the database

       db.commit()

       c.close()

  except:

       # Rollback in case there is any error

       db.rollback()

       # Close database connection

       db.close()

@profile

def main():

  pifacedigital = pifacedigitalio.PiFaceDigital()

  listener = pifacedigitalio.InputEventListener(chip=pifacedigital)

  # set up listeners for buttons

  listener.register(0, pifacedigitalio.IODIR_FALLING_EDGE, pulsetodb)

  # Start listening for events.

  listener.activate()

__name__ == '__main__' and main()

=========

And now the output from the memory_profiler:

=========

pi@domotica ~ $ python -m memory_profiler ./pif_inputs.py

Filename: ./pif_inputs.py

Line #    Mem usage    Increment   Line Contents

================================================

    49      7.9 MiB      0.0 MiB   @profile

    50                             def main():

    51      7.9 MiB      0.1 MiB   pifacedigital = pifacedigitalio.PiFaceDigital()

    52      8.3 MiB      0.4 MiB   listener = pifacedigitalio.InputEventListener(chip=pifacedigital)

    53                            

    54                             # set up listeners for buttons

    55      8.3 MiB      0.0 MiB   listener.register(0, pifacedigitalio.IODIR_FALLING_EDGE, pulsetodb)

    56                            

    57                             # Start listening for events.

    58      8.3 MiB      0.0 MiB   listener.activate()

Filename: ./pif_inputs.py

Line #    Mem usage    Increment   Line Contents

================================================

    21      8.5 MiB      0.0 MiB   @profile

    22                             def pulsetodb(pifacedata):

    23                            

    24                             # Open database connection

    25      9.4 MiB      0.9 MiB   db = MySQLdb.connect('localhost', 'web', '~?0aU$+I63', 'domotica', charset='utf8', use_unicode=True)

    26                            

    27                             # Prepare SQL query to INSERT a record into the database

    28      9.4 MiB      0.0 MiB   sql = "INSERT INTO raw_piface(timestamp, field, status) VALUES( %s , %s , %s )"

    29                            

    30      9.4 MiB      0.0 MiB   try:

    31                             # Prepare a cursor object using cursor() method

    32      9.4 MiB      0.0 MiB   c = db.cursor()

    33                            

    34                             # Execute the SQL command

    35      9.4 MiB      0.0 MiB   c.execute(sql, ( pifacedata.timestamp, pifacedata.pin_num, pifacedata.direction ))

    36                            

    37                             # Commit your changes in the database

    38      9.4 MiB      0.0 MiB   db.commit()

    39      9.4 MiB      0.0 MiB   c.close()

    40                            

    41                             except:

    42                             # Rollback in case there is any error

    43                             db.rollback()

    44                            

    45                             # Close database connection

    46      9.4 MiB      0.0 MiB   db.close()

Filename: ./pif_inputs.py

Line #    Mem usage    Increment   Line Contents

================================================

    21      9.6 MiB      0.0 MiB   @profile

    22                             def pulsetodb(pifacedata):

    23                            

    24                             # Open database connection

    25      9.6 MiB      0.0 MiB   db = MySQLdb.connect('localhost', 'web', '~?0aU$+I63', 'domotica', charset='utf8', use_unicode=True)

    26                            

    27                             # Prepare SQL query to INSERT a record into the database

    28      9.6 MiB      0.0 MiB   sql = "INSERT INTO raw_piface(timestamp, field, status) VALUES( %s , %s , %s )"

    29                            

    30      9.6 MiB      0.0 MiB   try:

    31                             # Prepare a cursor object using cursor() method

    32      9.6 MiB      0.0 MiB   c = db.cursor()

    33                            

    34                             # Execute the SQL command

    35      9.6 MiB      0.0 MiB   c.execute(sql, ( pifacedata.timestamp, pifacedata.pin_num, pifacedata.direction ))

    36                            

    37                             # Commit your changes in the database

    38      9.6 MiB      0.0 MiB   db.commit()

    39      9.6 MiB      0.0 MiB   c.close()

    40                            

    41                             except:

    42                             # Rollback in case there is any error

    43                             db.rollback()

    44                            

    45                             # Close database connection

    46      9.6 MiB      0.0 MiB   db.close()

Filename: ./pif_inputs.py

Line #    Mem usage    Increment   Line Contents

================================================

    21      9.7 MiB      0.0 MiB   @profile

    22                             def pulsetodb(pifacedata):

    23                            

    24                             # Open database connection

    25      9.7 MiB      0.0 MiB   db = MySQLdb.connect('localhost', 'web', '~?0aU$+I63', 'domotica', charset='utf8', use_unicode=True)

    26                            

    27                             # Prepare SQL query to INSERT a record into the database

    28      9.7 MiB      0.0 MiB   sql = "INSERT INTO raw_piface(timestamp, field, status) VALUES( %s , %s , %s )"

    29                            

    30      9.7 MiB      0.0 MiB   try:

    31                             # Prepare a cursor object using cursor() method

    32      9.7 MiB      0.0 MiB   c = db.cursor()

    33                            

    34                             # Execute the SQL command

    35      9.7 MiB      0.0 MiB   c.execute(sql, ( pifacedata.timestamp, pifacedata.pin_num, pifacedata.direction ))

    36                            

    37                             # Commit your changes in the database

    38      9.7 MiB      0.0 MiB   db.commit()

    39      9.7 MiB      0.0 MiB   c.close()

    40                            

    41                             except:

    42                             # Rollback in case there is any error

    43                             db.rollback()

    44                            

    45                             # Close database connection

    46      9.7 MiB      0.0 MiB   db.close()

=========

As you can see, the interrupt function is showed once, but the function with SQL is called frequently. Here you can see the memory usage is rising. If the script is running for view hours, it stops on "out of memory". The problem must be in the Interrupt part.

Who can help me?

cheers, Jack.

Hi Jack,

I have the same problem of memory leaks, did you found solution ?

Greatings Marc

Actually, I stand corrected.  I noticed that my Pi becomes unresponsive after about 48 hours of continuous use of the time display script.

Hi I am experiencing the same issue, the issue seems to lie with the listener as I am pretty sure that I have tried everything else including manual garbage collection and clearing all variables manually after calling the functions. Does anyone have any further insight into this as of yet or possibly a workaround?

Hi, I have the same problem with the memory.

It is coming from the interupt section.

I on my way found an work around on restarting my process by a cron job every 15 minutes.

This is working, but not the best way.

Waiting for an solution.

Greetings Marc

with installed gc i got this on gc.collect()  / and memory is rising -- 

[<pifacedigitalio.core.PiFaceDigital object at 0x1cfa510>,

<pifacedigitalio.core.PiFaceDigital object at 0x1d6e5f0>,

<pifacedigitalio.core.PiFaceDigital object at 0x1d860f0>,

<pifacedigitalio.core.PiFaceDigital object at 0x1d95bd0>,

<pifacedigitalio.core.PiFaceDigital object at 0x1dae6d0>,

<pifacedigitalio.core.PiFaceDigital object at 0x1d55b10>,

<pifacedigitalio.core.PiFaceDigital object at 0x1d46030>,

<pifacedigitalio.core.PiFaceDigital object at 0x1dc61d0>]