At 2014-12-26 13:11:43 -0500, br...@momjian.us wrote: > > Is this something that could potentially change the data stored on > disk? Does pg_upgrade need to check for changes in this area? Is the > detection exposed by pg_controldata? Could this affect running the > data directory on a different CPU?
No to all. Subsequent to Heikki's change (already in master) to use the CRC-32C algorithm (instead of the earlier mistakenly-reflected-but-not-quite one), both the slice-by-8 software implementation posted earlier and the SSE4.2 CRC32* instructions will compute exactly the same value. (Yes, I have verified this in both cases.) -- Abhijit -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers