Memory leak?

[andreymal]

(I tried to reproduce this for few months and today I did it >_<)

import gc
from datetime import datetime

from pony.orm import * 

db = Database()

class Author(db.Entity):
    comments = Set('Comment')

class Post(db.Entity):
    pass

class Comment(db.Entity):
    author = Required(Author)

db.bind('sqlite', ':memory:')
db.generate_mapping(create_tables=True)

# prepare data

print('fill database...')
with db_session:
    a = Author(id=1)
    for i in range(2, 5000):
        Author(id=i)
        Post(id=i)
        Comment(author=a)
    del a

# test it!

@db_session
def testme():
    author = Author.get(id=15)
    comments_list = Comment.select(lambda x: x.author.id == author.id)
    ids = list(select(x.id for x in Post))

print('started')
while True:
    testme()
    gc.collect()

If you run it, then memory of python process will leak (+8MB per second on my machine).

Very strange things that prevented me from reproducing it:

• If you append author_id = author.id and replace == author.id with == author_id, then everything is fine.
• OR if you just comment/delete line ids = ..., then everything is fine too!

WTF?

[kozlovsky]

This is very interesting, thank you for reporting! I'll investigate that...

[kozlovsky]

We fixed memory leak, thank you very much! The fix will be included in PonyORM release 0.7.2