Neil Schemenauer <nas-pyt...@arctrix.com> added the comment:
> sys.getsizeof(3.14) is 24. And it becomes 32 byte in 16byte aligned > pymalloc. (+33%) I've been doing some reading and trying to understand this issue. My understanding is that malloc() needs to return pointers that are 16-byte aligned on AMD64 but, in general, pointers don't have the be aligned that way. If you have a structure that contains a "long double" then that member also has to be 16-bit aligned. It seems to me that we don't need to have the PyObject structure containing a Python float to be 16-byte aligned. If so, could we introduce a new obmalloc API that returns memory with 8-byte alignment, for use by objects that know they don't require 16-byte alignment? floatobject.c could use this API to avoid the 33% overhead. The new obmalloc API could initially be internal use only until we can come up with a design we know we can live with long term. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue27987> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
