![]() ![]() Block MATLAB notation: \(A(:,j)\) means \(j\)th block column.But these are a little complicated, and maybe it’s worth first describing a simpler algorithm as a straw man. There are two main contendors for distributed memory matrix-matrix multiply: SUMMA and Cannon’s algorithm. We know that we are going to do 2n^3 flops overall our goal is to evenly divide this work across processors, and do as little communication as possible. Actually, we usually do a matrix-matrix product with addition this is the operation known as DGEMM. ![]() Having warmed up with the matrix-vector product case, let’s move now to matrix-matrix products.
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