Serhiy Storchaka added the comment:
There is an existing protocol for estimating the size of allocated memory.
__sizeof__. Python API sys.getsizeof() and C API _PySys_GetSizeOf(). But it is
too heavy for using in GC.
As a fast approximation the default implementation of the __sizeof__ method can
be used:
tp_basicsize + tp_itemsize * Py_SIZE(self)
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nosy: +serhiy.storchaka
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<http://bugs.python.org/issue31105>
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