On Fri, Jul 30, 2021 at 4:00 PM Andres Freund <andres@anarazel.de> wrote:
> I don't agree with that? If (user+system) << wall then it is very likely
> that recovery is IO bound. If system is a large percentage of wall, then
> shared buffers is likely too small (or we're replacing the wrong
> buffers) because you spend a lot of time copying data in/out of the
> kernel page cache. If user is the majority, you're CPU bound.
>
> Without user & system time it's much harder to figure that out - at
> least for me.
Oh, that's an interesting point. At least now I'll know why I am
supposed to care about that log line the next time I see it. I guess
we could include both things, though the line might get a little long.
Or maybe there's some other subset that would make sense.
--
Robert Haas
EDB: http://www.enterprisedb.com