Hi, On 2017-09-19 17:00:05 -0500, Jerry Sievers wrote: > Briefly, just curious if legacy max values for shared_buffers have > scaled up since 8G was like 25% of RAM? It's very workload dependent. I've successfully used PG with roughly 1TB of shared buffers, where that performed better than lower settings. > Pg 9.3 on monster 2T/192 CPU Xenial thrashing Not sure what the word "thrashing" in that sentence means. Things have improved a lot since 9.3 WRT to scalability, so I'd not infer too much from 9.3 performance on a larger box. > Upgrade pending but we recently started having $interesting performance > issues at times looking like I/O slowness and other times apparently > causing CPU spins. That's not something we can really usefully comment on given the amount of information. > Anyway, shared_buffer coherency generally high but does take big dips > that are sometimes sustained for seconds or even minutes. "shared_buffer coherency"? Greetings, Andres Freund -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
