In this presentation you will learn about: - The concurrent.futures API of Python 3 - Threads vs forked processes vs spawned processes (pros and cons) - The impact of the GIL on CPU-bound Python programs - Bad interactions of fork-based multiprocessing and OpenMP runtimes - BLAS-based parallelism (e.g. MKL, OpenBLAS) - Memory bandwidth bound operations, arithmetic intensity and the roofline model.