On Wed, Sep 12, 2012 at 06:44:37AM -0400, Gurjeet Singh wrote: > Thinking a bit more about the need for locks, I guess even the shared > variables whose read/write ops are considered atomic need to be protected > by locks so that the effects of NUMA architectures can be mitigated.
src/backend/storage/lmgr/README.barrier has nice coverage of such issues. NUMA does not change the picture. CPU architecture specifications define ordering constraints for instructions that touch memory. NUMA is a property of specific system implementations that changes performance characteristics, but not functional guarantees, of those instructions. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
