It seems to me that such a memory space could be physically mapped quite large while still presenting 64-bit virtual memory addresses to the local node? How likely is it that any given node would be mapping out more than 2^64 bytes worth of virtual pages?
The VM system could quite simply track the physical addresses as a pair of `u64_t`s or whatever, and present those pages as 64-bit pointers.
It seems in particular you might want to have this anyways, because the actual costs for dealing with such external memories would have to be much higher than local memory. Optimizing access would likely involve complicated cache hierarchies.
I mean, it'd be exciting if we had need for memory space larger than 2^64 but I just find it implausible with current physics and programs? But I'm also getting old.
The VM system could quite simply track the physical addresses as a pair of `u64_t`s or whatever, and present those pages as 64-bit pointers.
It seems in particular you might want to have this anyways, because the actual costs for dealing with such external memories would have to be much higher than local memory. Optimizing access would likely involve complicated cache hierarchies.
I mean, it'd be exciting if we had need for memory space larger than 2^64 but I just find it implausible with current physics and programs? But I'm also getting old.