Andrew Barnert via Python-Dev wrote:
imagine someone manages to remove the GIL from CPython by using STM: now most transactions are bumping that global counter, meaning most transactions fail and have to be retried,
If this becomes a problem, the tag could be split into two parts of m and n bits, with m + n = 64. Use a global counter for allocating the high half, and increment the low half locally. When the low half overflows, allocate a new high half. A value of n = 16 or so ought to reduce contention for the global counter to something fairly negligible, I would think, without much risk of the high half ever wrapping around. -- Greg _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
