noraabiakar authored 6 years ago and Sam Yates committed 6 years ago

* Add gpu_context as part of execution context containing information about GPU availability, managed_memory synchronization, and atomic double availability.
* Choose between ON and OFF for ARB_GPU in CMake. If ON compile for K20, K80, and P100

Note that we still need compile time information about the GPU in cuda_atomic.hpp for atomicAdd(double*, double*). This is because the function is only defined when the program is compiled  for sm_60 or more.