What will be the cost of this implementation

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Consider the column-wise implementation of matrix-vector product (Program 6.5). An alternate implementation will be to use MPI Allreduce to perform the required reduction operation and then have each process copy the locally stored elements of vector x from the vector fx. What will be the cost of this implementation? Another implementation can be to perform p single-node reduction operations using a different process as the root. What will be the cost of this implementation?

Reference no: EM131091176

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