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

[Mark Adams]

Here is the times for KSPSolve on one node with 2,280,285 equations. These
nodes seem to have 42 cores. There are 6 "devices" (GPUs) and 7 core
attached to the device. The anomalous 28 core result could be from only
using 4 "devices".  I figure I will use 36 cores for now. I should really
do this with a lot of processors to include MPI communication...

NP   KSPSolve
20    5.6634e+00
24    4.7382e+00
28    6.0349e+00
32    4.7543e+00
36    4.2574e+00
42    4.2022e+00
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