README.md

Exercise 3: Learn how to use and manage basic Kokkos View

In this exercise, you will learn how to use and manage basic Kokkos Views.

Step 1: Create a Kokkos View

Open the file main.cpp that will be used for this exercise.

• Create a 3D Kokkos View of size Nx x Ny x Nz of type double.

Kokkos::View<double***> matrix("matrix", Nx, Ny, Nz);

Step 2: Get the rank of the View

• Call the rank method to get the number of dimensions of the View and store it in a variable rank.
• Add the code to print it in the terminal, for instance:

std::cout << "Matrix rank: " << rank << std::endl;

Step 3: Get the extent of the View

• Call the extent method to get the size of each dimension of the View
• Add the code to print it in the terminal.

Step 4: Layout of the View

• Call the stride method to get the stride of each dimension of the View
• Add the code to print it in the terminal.

Step 5: Compile and run the program

• Compile the program using the OpenMP backend and run it. Check the output.

• Deduce from the stride the layout of the View.

• If you can access a GPU, compile the program using a GPU backend and run it. Check the output and compare them with the OpenMP backend.