SC20 Is Everywhere We Are

SC20 Virtual Platform
Hostile Cache Implications for Small, Dense Linear Solves
Event Type
Workshop
Registration Categories
W
TimeWednesday, 11 November 20202:31pm - 3pm EDT
LocationTrack 5
DescriptionThe full assembly of the stiffness matrix in finite element codes can be prohibitive in terms of memory footprint resulting from storing that enormous matrix. An optimisation and work around, particularly effective for discontinuous Galerkin based approaches, is to construct and solve the small dense linear systems locally within each element and avoid the global assembly entirely. The different independent linear systems can be solved concurrently in a batched manner, however we have found that the memory subsystem can show destructive behaviour in this paradigm, severely affecting the performance. In this paper we demonstrate the range of performance that can be obtained by allocating the local systems differently, along with evidence to attribute the reasons behind these differences.
Back To Top Button