On Tuesday, July 03, 2012 05:41:09 PM Tom Lane wrote: > Andres Freund <and...@2ndquadrant.com> writes: > > Btw, RhodiumToad/Andrew Gierth on irc talked about a reason why sysv > > shared memory might be advantageous on some platforms. E.g. on freebsd > > there is the kern.ipc.shm_use_phys setting which prevents paging out > > shared memory and also seems to make tlb translation cheaper. There does > > not seem to exist an alternative for anonymous mmap. > Isn't that mlock()? Similar at least yes. I think it might also make the virtual/physical translation more direct but that ist just the impression of a very short search.
> > So maybe we should make that a config option? > I'd really rather not. If we're going to go in this direction, we > should just go there. I don't really care, just wanted to bring up that at least one experienced user would be disappointed ;). As the old implementation needs to stay around for EXEC_BACKEND anyway, the price doesn't seem to be too high. Andres -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
