On Tue, 21 Oct 2003, Josh Berkus wrote: > Scott, > > > Also, if it's a read only environment, RAID5 with n drives equals the > > performance of RAID0 with n-1 drives. > > True. > > > Josh, you gotta get out more. IA32 has supported >4 gig ram for a long > > time now, and so has the linux kernel. It uses a paging method to do it. > > Individual processes are still limited to ~3 gig on Linux on 32 bit > > hardware though, so the extra mem will almost certainly spend it's time as > > kernel cache. > > Not that you'd want a sigle process to grow that large anyway.
True :-) Especially a pgsql backend. > So what is the ceiling on 32-bit processors for RAM? Most of the 64-bit > vendors are pushing Athalon64 and G5 as "breaking the 4GB barrier", and even > I can do the math on 2^32. All these 64-bit vendors, then, are talking > about the limit on ram *per application* and not per machine? I think it's 64 gigs in the current implementation, but that could just be a chip set thing, i.e. the theoretical limit is probably 2^63 or 2^64, but the realistic limitation is that the current mobo chipsets are gonna have a much lower limit, and I seem to recall that being 64 gig last I looked. ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend
