Hands-On GPU Programming with Python and CUDA

Level-1 AXPY with cuBLAS

Let's start with a basic level-1 ax + y (or AXPY) operation with cuBLAS. Let's stop for a moment and review a bit of linear algebra and think about what this means. Here, a is considered to be a scalar; that is, a real number, such as -10, 0, 1.345, or 100. x and y are considered to be vectors in some vector space, . This means that x and y are n-tuples of real numbers, so in the case of , these could be values such as [1,2,3] or [-0.345, 8.15, -15.867]. ax means the scaling of x by a, so if a is 10 and x is the first ...