>
>> 32-64GB is out of the intel arena altogether. You are firmly in mainframe
>> land unless clustering stuff would work. Go set Sun, IBM and SGI bidding
>> against each other and get some third party disk quotes 8)
>
>Any particular reasons why? With 36-bit addressing and 3-level page
>tables, there's no technical reason why Linux won't eventually be able
>to address that much memory on Intel.
>
If I remember correctly the 36 bit addressing on Intel does not use
36 bit offsets. (I don't recall the exact scheme -- something like
segments and offsets?) So to actually use > 4 Gigs of memory your
application would need to do some extra translation work and take
a performance hit. For big simulations we routinely use a lot more
than 4 Gigs of memory on Origin 2000's and we need every bit of
performance we can get.
Regards
Emil Briggs
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