On Wed, 2008-05-14 at 20:25 +0100, Gregory Stark wrote: > The Linux kernel does have some macros meant to mark unlikely branches > (usually assertion failures) but I'm not sure how they work. And Gcc also has > a few optimizations which are driven by profiling data but I it doesn't sound > like this is one of them.
GCC's profile-driven optimization can be used to guide decisions about both branch prediction/likelihood and function inlining. IMHO it is definitely worth building the infrastructure to get Postgres builds with profile-driven optimization -- certainly more maintainable and less arbitrary than builtin_expect() and friends to me. -Neil -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
