On 2017-02-02 14:47:53 -0500, Robert Haas wrote: > I expect that increasing the maximum value of shared_buffers beyond > what can be stored by an integer could have a noticeable distributed > performance cost for the entire system. It might be a pretty small > cost, but then again maybe not; for example, BufferDesc's buf_id > member would have to get wider, and probably the freeNext member, too. > Andres already did unspeakable things to make a BufferDesc fit into > one cache line for performance reasons, so that wouldn't be great > news.
Yea, we'd have to get rid of BufferDesc's buf_id - but that's not that hard, just a bit verbose. You can get the buf_id already with a tiny bit of pointer math. I don't think there should be too many other changes, but I might be wrong. Andres -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
