A cell-wise primary storage for continuous high-order FEM enables exact matrix-free CG iteration on GPUs by confining communication to the preconditioner and realizing DSS via sequential axis face exchanges without gather-scatter or atomics.
Wall and Martin Kronbichler , title =
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Coalesced Matrix-Free Finite Elements in Cell-Wise Storage
A cell-wise primary storage for continuous high-order FEM enables exact matrix-free CG iteration on GPUs by confining communication to the preconditioner and realizing DSS via sequential axis face exchanges without gather-scatter or atomics.