Large scale and hybrid computing with CP2K - Prace Training Portal
Large scale and hybrid computing with CP2K - Prace Training Portal
Large scale and hybrid computing with CP2K - Prace Training Portal
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Towards O(1) :constant walltime <strong>with</strong> proportional resourcesTotal timeStringent test:Small blocks, large overheadVery sparse matricesRunning <strong>with</strong> 200 atoms / MPI taskOverheadLocal multipliesCommunicationLocal multiplies constant (OK!).Overhead & CommunicationGrows <strong>with</strong> sqrt(N)Needs a replacement for CannonWork is underway to replace the Cannon algorithm <strong>with</strong> something new!Retain the sqrt(N) max comm, yield constant comm in the limit.
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