>>>>> On Tue, 15 Feb 2005 13:59:45 -0600, Robin Holt <[EMAIL PROTECTED]> said:
>> I certainly don't want to switch my machines to 4-levels. There
>> is zero need for that on the machines I use, so why pay the
>> overhead of an extra level?
Robin> I missed the why the extra level question. That part is
Robin> motivated by some large MPI jobs need a fourth level to get a
Robin> large enough single mapping to cover their entire dataset.
Robin> We have already tripped this limitation for a couple of our
Robin> really large customers.
What I'm saying is that the default probably should stay at 3-levels.
Optimizing ia64 linux _just_ for "really large customers" would be
a bad direction to go in.
--david
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