Cannon's algorithm

In <a href="/facts/Computer_science/lN3pEyPz">computer science</a>, Cannon's algorithm is a <a href="/facts/Distributed_algorithm/S35ydYjK">distributed</a> <a href="/facts/Algorithm_for_matrix_multiplication/VrYWxfDt">algorithm for matrix multiplication</a> for two-dimensional <a href="/facts/Mesh_networking/XnVSy5rK">meshes</a> first described in 1969 by Lynn Elliot Cannon.
It is especially suitable for computers laid out in an N × N mesh. While Cannon's algorithm works well in homogeneous 2D grids, extending it to heterogeneous 2D grids has been shown to be difficult.
The main advantage of the algorithm is that its storage requirements remain constant and are independent of the number of processors.
The Scalable Universal Matrix Multiplication Algorithm (SUMMA)
is a more practical algorithm that requires less workspace and overcomes the need for a square 2D grid. It is used by the <a href="/facts/ScaLAPACK/LfBYHxLJ">ScaLAPACK</a>, <a href="/facts/PLAPACK/sMGe0RhF">PLAPACK</a>, and <a href="https://code.google.com/p/elemental/">Elemental</a> libraries.

Cannon's algorithm open-in-new

Cannon's algorithm