* Added notes concerning OLCF Frontier (first exascale machine).

external-hpc/20230117.OLCF-Frontier.txt

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+The Frontier 1.5EF Supercomputer (OLCF)
+=======================================
+
+
+Frontier Spec Sheet
+-------------------
+https://www.olcf.ornl.gov/wp-content/uploads/2019/05/frontier_specsheet.pdf
+
+>   "The Frontier system will be composed of more than 100 Cray Shasta
+    cabinets with high density compute blades powered by HPC and
+    AI-optimized AMD EPYC processors and Radeon Instinct GPU accelerators
+    purpose-built for the needs of exascale computing. The new
+    accelerator-centric compute blades will support a 4:1 GPU to CPU ratio
+    with high speed AMD Infinity Fabric links and coherent memory between
+    them within the node. Each node will have one Slingshot interconnect
+    network port for every GPU with streamlined communication between the
+    GPUs and network to enable optimal performance for high-performance
+    computing and AI workloads at exascale."
+
+
+