Re: Streaming I/O, vectored I/O (WIP) - Mailing list pgsql-hackers

On Fri, Mar 29, 2024 at 9:45 AM Heikki Linnakangas <hlinnaka@iki.fi> wrote:
> master (213c959a29):            8.0 s
> streaming-api v13:              9.5 s

Hmm, that's not great, and I think I know one factor that has
confounded my investigation and the conflicting reports I have
received from a couple of people: some are using meson, which is
defaulting to -O3 by default, and others are using make which gives
you -O2 by default, but at -O2, GCC doesn't inline that
StartReadBuffer specialisation that is used in the "fast path", and
possibly more.  Some of that gap is closed by using
pg_attribute_inline_always.  Clang fails to inline at any level.  So I
should probably use the "always" macro there because that is the
intention.  Still processing the rest of your email...