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I think you'd have a hard time making a case that Summit is a cyclical return to any part of the Amiga 500 :) "fully coherent single address space with all mem
by tntn 7y ago
I think you'd have a hard time making a case that Summit is a cyclical return to any part of the Amiga 500 :)
"fully coherent single address space with all memory available to [all processors]" is a lot easier if there is no virtual memory, no caching, and all processors are on a single shared bus to the same memory chips.
- wahern 7y agoYou left out the qualifier "Single-socket nodes". It's much easier when all the components are on the same die.
- jacobush 7y agoWhich system are you referring to here?
- wahern 7y agoFrom the article, > Single-socket nodes will consist of one CPU and four GPUs, connected by AMD’s custom high bandwidth, low latency coherent Infinity fabric. The article, at least, only describes coherency in the context of single-socket nodes. I suppose it's ambiguous whether Infinity fabric only connects components on the node or connects nodes to each other, but in fact Infinity fabric is the interconnect used with Zen CPUs, so I think it's pretty clear that in this case it only connects and provides memory coherency for 1xCPU and 4xGPUs. Performant memory coherency across nodes would be quite an achievement, but not one they seem to have achieved. Rather, it seems they've simply revived the PS4 model.
- jacobush 7y agoSo the comparison to an Amiga 500 maybe wasn't so crazy after all. :)