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What's the advantages of infinity fabric over pcie 4 for cpu/gpu? What interconnects do these sorts of machines use? I assume even 100GbE isn't enough? Just c
by berbec 7y ago
What's the advantages of infinity fabric over pcie 4 for cpu/gpu?
What interconnects do these sorts of machines use? I assume even 100GbE isn't enough?
Just curious. It's interesting what exists in the "so far beyond my price range as to be ludicrous" category.
- Symmetry 7y agoPCIe provides communication but isn't intended to provide memory coherency. There's a lot of work that goes on in figuring out which cache(s) have a copy of which cache line and figuring out how to resolve conflicting access needs.
- gnode 7y agoInfinity Fabric / HyperTransport is generally lower level and lower latency than PCIe. It's aimed more for use as a front-side bus than a peripheral interconnect. A better analogue would be Intel's QuickPath Interconnect.
- Grazester 7y agoAs to the interconnect question. They usually use InfiniBand but Cray uses their proprietary interconnect tech.