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Cannon's Alg

# Cannon's Alg - Mesh Implementations Cannon's Algorithm Uses...

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Mesh Implementations Cannon’s Algorithm Uses a mesh of processors with wraparound connections (a torus) to shift the A elements (or submatrices) left and the B elements (or submatrices) up. 1.Initially processor Pi,j has elements ai,j and bi,j (0 <= i < n, 0 <= k < n). 2. Elements are moved from their initial position to an “aligned” position. The complete ith row of A is shifted i places left and the complete jth column of B is shifted j places upward. This has the effect of placing the element ai,j+i and the element bi+j,j in processor Pi,j,. These elements are a pair of those required in the accumulation of ci,j. 3.Each processor, Pi,j, multiplies its elements. 4. The ith row of A is shifted one place right, and the jth column of B is shifted one place upward. This has the effect of bringing together the adjacent elements of A and B, which will also be required in the accumulation. 5. Each processor, Pi,j, multiplies the elements brought to it and adds the result to the accumulating sum.

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Cannon's Alg - Mesh Implementations Cannon's Algorithm Uses...

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