Definition for DAT

Peter_Chun_Pang_Li · June 1, 2024, 12:44am

Hi, as I am going through pair_lj_cut_kokkos.h to see how can I adapt my in house potential to be supported by the KOKKOS package, I encounterd DAT from the following snippet of code:

  DAT::tdual_efloat_1d k_eatom;
  DAT::tdual_virial_array k_vatom;

I looked through all the header file included in pair_lj_cut_kokkos.h , but none of them has defined what DAT is. Do you know from which file is DAT defined? Thanks!

akohlmey · June 1, 2024, 4:23am

github.com

lammps/lammps/blob/e8ee0d9e71fa65aaea0f6da8d89de42e4130490e/src/KOKKOS/kokkos_type.h#L1264


      
          typedef Kokkos::DualView<int**, Kokkos::LayoutRight, LMPDeviceType> tdual_neighbors_2d_lr;
          typedef tdual_neighbors_2d_lr::t_host t_neighbors_2d_lr;
          typedef tdual_neighbors_2d_lr::t_host_const t_neighbors_2d_const_lr;
          typedef tdual_neighbors_2d_lr::t_host_um t_neighbors_2d_um_lr;
          typedef tdual_neighbors_2d_lr::t_host_const_um t_neighbors_2d_const_um_lr;
          typedef tdual_neighbors_2d_lr::t_host_const_randomread t_neighbors_2d_randomread_lr;
          
          };
          #endif
          //default LAMMPS Types
          typedef struct ArrayTypes<LMPDeviceType> DAT;
          typedef struct ArrayTypes<LMPHostType> HAT;
          
          template<class DeviceType, class BufferView, class DualView>
          void buffer_view(BufferView &buf, DualView &view,
                           const size_t n0,
                           const size_t n1) {
          
            buf = BufferView(view.template view<DeviceType>().data(),n0,n1);
          
          }

Peter_Chun_Pang_Li · June 1, 2024, 5:13pm

Thank you!

Robert_Young · November 18, 2025, 3:33pm

Hold up, I want to piggyback off of this. I see where DAT, HAT, and AT are defined at the type, but if I run into an error stating something like

"class DAT has no member "XY"
DAT::XY xy;

, where do I go to determine what member types even exist and how I can fix this error?

akohlmey · November 18, 2025, 4:28pm

Searching through the LAMMPS source files in the KOKKOS folder with grep points to the src/KOKKOS/kokkos_type.h file.

That is more difficult. I would look at the changes in a similar source file that is part of the LAMMPS distribution and display the changes between the LAMMPS version your code was written for and the version that you are compiling for.