> On 23 Apr 2025, at 09:16, Laurenz Albe <laurenz.albe@xxxxxxxxxxx> wrote: > On Wed, 2025-04-23 at 00:21 -0500, Igor Korot wrote: >> However, this page >> https://www.postgresql.org/docs/current/runtime-config-resource.html#GUC-EFFECTIVE-IO-CONCURRENCY >> describes both default and mn/max, however t s says: >> >> [quote] >> The default is 1 on supported systems, otherwise 0 >> [/quote]] >> >> No explanation of what is "supported system" is given... >> >> And the same can be said about >> https://www.postgresql.org/docs/current/runtime-config-resource.html#GUC-MAINTENANCE-IO-CONCURRENCY. > > According to the source, it is "systems that have posix_fadvise()". We could document that, > but I don't know if it would help many people. I am not sure how easy and feasible it is > to research which versions of which operating systems qualify. From memory it's supported on FreeBSD, NetBSD and Linux with Windows, macOS and OpenBSD not supporting it. Assuming I'm not completely wrong (a 1 minute search shows it's in the ballpark) we could perhaps add something like "Unsupported platforms include (but isn't limited to) Windows and macOS" which would provide a bit more clarity. -- Daniel Gustafsson
