[petsc-dev] [petsc-maint] running CUDA on SUMMIT

[Mark Adams]

FYI, Here is some scaling data of GAMG on SUMMIT. Getting about 4x GPU
speedup with 98K dof/proc (3D Q2 elasticity).

This is weak scaling of a solve. There is growth in iteration count folded
in here. I should put rtol in the title and/or run a fixed number of
iterations and make it clear in the title.

Comments welcome.
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