On Wednesday 24 November 2010 22:25:45 Tom Lane wrote: > Robert Haas <robertmh...@gmail.com> writes: > > On Nov 24, 2010, at 4:05 PM, Andres Freund <and...@anarazel.de> wrote: > >> Yes, but only once. Also scrubbing a page is faster than copying it... > >> (and there were patches floating around to do that in advance, not sure > >> if they got integrated into mainline linux) > > > > I'm not following - can you elaborate? > > I think Andres is saying that bss space isn't optimized during a fork > operation: it'll be propagated to the child as copy-on-write pages. > Dunno if that's true or not, but if it is, it'd be a good reason to > avoid the scheme you're suggesting. Afair nearly all pages are propagated with copy-on-write semantics.
Andres -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
