Re: Linux v.s. Mac OS-X Performance - Mailing list pgsql-general

On Mon, Nov 12, 2007 at 11:31:59AM -0600, Scott Marlowe wrote:
> On Nov 12, 2007 11:29 AM, Sam Mason <sam@samason.me.uk> wrote:
> > You don't need a 32bit kernel to support 8GB of memory should you? As
> > long as the kernel supports PAE that should be enough to make use of it.
> > You only need a 64bit address space when each process wants to see more
> > than ~3GB of RAM.
>
> There's a performance hit for using PAE.  Not sure what it is, but I
> recall it being the in the 5 to 10% range.

And what's the performance hit of using native 64bit code?  I'd guess
similar, moving twice as much data around with each pointer has got to
affect things.


  Sam