Message 301076 - Python tracker

Ahah.
Actually, it's quite simple :-) On 64-bit Python:

>>> id(82914 - 82913) == id(1)
True

On 32-bit Python:

>>> id(82914 - 82913) == id(1)
False

So the first non-zero alloc_delta really has a snowball effect, as it creates new memory block which will produce a non-zero alloc_delta on the next run, etc.