[[PageOutline]]

= Application Name =

Matmul Files

= Summary =

* '''Name''': {{{Matmul Files}}}
* '''Contact Person''': {{{support-compss@bsc.es}}}
* '''Access Level''': {{{public}}}
* '''License Agreement''': {{{Apache2}}}
* '''Platform''': {{{COMPSs}}}
* '''Repository''': [[https://compss.bsc.es/svn/bar/apps/c/matmul|Matmul Files]]


 == Description ==
Matrix multiplication is a binary operation that takes a pair of matrices and produces another matrix.

If A is an n×m matrix and B is an m×p matrix, the result AB of their multiplication is an n×p matrix defined only if the number of columns m in A is equal to the number of rows m in B. When multiplying A and B, the elements of the rows in A are multiplied with corresponding columns in B.

In this implementation, A and B are square matrices (same number of rows and columns), and so it is the result matrix C. Each matrix is divided in N blocks of M doubles. The multiplication of two blocks is done by a multiply task method with a simple three-nested-loop implementation. When executed with COMPSs, the main program generates N^3^ tasks arranged as N^2^ chains of N tasks in the dependency graph.

== Execution instructions ==
Usage:
runcompss matmul <numberOfBlocks> <blockSize>

where:
		 * - numberOfBlocks: Number of blocks inside each matrix
		 * - blockSize: Size of each block

== Execution Example ==
runcompss matmul 16 4


== Build ==
buildapp matmul