20 Jan
2017
20 Jan
'17
1:53 p.m.
On Fri, 20 Jan 2017 22:30:16 +0900
INADA Naoki
Moving the refcount out of the PyObject will probably make increfs / decrefs more costly, and there are a lot of them. We'd have to see actual measurements if a patch is written, but my intuition is that the net result won't be positive.
Regards
Antoine.
I agree with you. But I have similar idea: split only PyGc_Head (3 words).
That sounds like an interesting idea. Once an object is created, the GC header is rarely accessed. Since the GC header has a small constant size, it would probably be easy to make its allocation very fast (e.g. using a freelist). Then the GC header is out of the way which increases the cache efficiency of GC-tracked objects. Regards Antoine.