On Thu, Apr 22, 2021 at 10:22:59PM +0200, Luca Ferrari wrote: > On Thu, Apr 22, 2021 at 10:15 PM Justin Pryzby <pryzby@xxxxxxxxxxxxx> wrote: > > Note that the interpretation of this GUC changed in v13. > > https://www.postgresql.org/docs/13/release-13.html > > |Change the way non-default effective_io_concurrency values affect concurrency (Thomas Munro) > > |Previously, this value was adjusted before setting the number of concurrent requests. The value is now used directly. Conversion of old values to new ones can be done using: > > |SELECT round(sum(OLDVALUE / n::float)) AS newvalue FROM generate_series(1, OLDVALUE) s(n); > > Yeah, I know, thanks. > However, I'm still curious about which tools to use to get info about > the storage queue/concurrency. I think you'd run something like iostat -dkx 1 and watch avgqu-sz. -- Justin
