justin wrote:
Tom Lane wrote:
Hmm ... I wonder whether this means that the current work on
parallelizing I/O (the posix_fadvise patch in particular) is a dead
end. Because what that is basically going to do is expend more CPU
to improve I/O efficiency. If you believe this thesis then that's
not the road we want to go down.
regards, tom lane
What does the CPU/ Memory/Bus performance road map look like?
Is the IO performance for storage device for what ever it be, going to
be on par with the above to cause this problem?
Flash memory will become just a fourth layer in the memory caching system
(on-board CPU, high-speed secondary cache, main memory, and persistent memory).
The idea of external storage will probably disappear altogether -- computers
will just have memory, and won't forget anything when you turn them off. Since
most computers are 64 bits these days, all data and programs will just hang out
in memory at all times, and be directly addressable by the CPU.
The distinction between disk and memory arose from the fact that disks were large, slow
devices relative to "core" memory and had to be connected by long wires, hence
the need for I/O subsystems. As flash memory becomes mainstream, I expect this
distinction to disappear.
Craig
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