[Guido] >>> but don't we have a whole word of GC-related flags? [Neil S] >> No. [James Y Knight] > Actually there is. Kinda. Currently python's refcounting scheme uses > 4 words per object (gc_next, gc_prev, gc_refs, ob_refcnt), and has > one spare word in the padding of PyGC_Head that's just sitting there > wasting memory. Using which compiler? This varies across boxes. Most obviously, on a 64-bit box all these members are 8 bytes (note that ob_refcnt is Py_ssize_t in 2.5, not int anymore), but even on some 32-bit boxes the "long double" trick only forces 4-byte alignment.
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