SC22: CXL3.0, the Future of HPC Interconnects and Frontier vs. Fugaku

HPC luminary Jack Dongarra's fascinating comments at SC22 on the low efficiency of leadership-class supercomputers highlighted by the latest High Performance Conjugate Gradients (HPCG) benchmark results will, I believe, influence the next generation of supercomputer architectures to optimize for sparse matrix computations. The upcoming technology that will help address this problem is CXL. Next generation architectures will use CXL3.0 switches to connect processing nodes, pooled memory and I/O resources into very large, coherent fabrics within a rack, and use Ethernet between racks. I call this a Petalith" architecture (explanation below), and I think CXL will play a significant and growing role in shaping this emerging development in the high performance interconnect space.

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