On Thu, 2004-06-24 at 14:56, Georgoulias Tom-rn0621 wrote: > Joshua Jensen wrote: > > On Wed, Jun 23, 2004 at 09:25:07PM -0500, Tom 'spot' Callaway wrote: > >>On a single CPU machine? Quite unlikely. If you had that much memory, it > >>would almost definitely be on an SMP machine, so, you would use the > >>hugemem kernel if you wanted to use 4/4, and SMP if not. > > > > > > I didn't say single CPU... let's say that I have a 2 way or 4 way > > machine with 12 gigs of memory. Not an uncommon scenario. > > In that case you'd use the hugemem if you want processes to have more > than >3GB address space, or smp if you don't. There is some performance > impact to using hugemem, but for us it hasn't been noticeable and the > benefit of larger processes more than offsets any impact. on an amd64 cpu the hugemem cost is really negliable; AMD has hardware support for this in that the cost of the 4g/4g split gets compensated....
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