This is a hands-on tutorial that introduces the basics of targetting GPUs with OpenMP 4.5 through a series of worked examples.

Starting with serial code, the tutorial takes you thorugh parallellising, exploring the performance characteristics, and optimising the following small programs:

• vadd – A simple vector addition program, often considered the "hello world" of GPU programming.
• pi – A numerical integration program that calculates and approximate value of π.
• jac_solv – A Jacobi solver.
• heat - An explicit finite difference 5-point stencil code.

To build all the examples:

make

To run, submit jobs using your training account:

qsub submit_vadd     # For vector add
qsub submit_pi       # For pi
qsub submit_jac_solv # For Jacobi
qsub submit_heat     # For heat

Versions of this tutorial have been presented at SC'17, SC'18, SC'19, and virtually at SC'20. A version of this tutorial was presented UK OpenMP Users' Conference in 2018 and 2019.