Does fiber make a cluster behave like local memory?
No. Optical links still have propagation, conversion, switching and protocol latency. A shared-memory programming model also requires appropriate coherence and transport mechanisms.
Answered in
In-Package Optical I/O: Where Photonics Changes AI NetworkingCo-packaged optics shortens electrical signal paths and moves conversion closer to chips. Copper, optical links and network protocols still have distinct roles.
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