On Fri, Aug 15, 2025 at 3:45 PM Andres Freund <and...@anarazel.de> wrote: > > My shared_buffers is 16GB, with pgbench scale 300. > > So there's actually no IO, given that a scale 300 is something like 4.7GB? In > that case my patch could really not make a difference, neither of the changed > branches would ever be reached?
This was an error on my part -- sorry. I think that the problem was that I forgot that I temporarily increased effective_io_concurrency from 100 to 1,000 while debugging this issue. Apparently that disproportionately affected the patched server. Could also have been an issue with a recent change of mine. -- Peter Geoghegan
