MPI reduction #12
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simple way: send data to master and reduce there; will not scale as well: O(n)
complex way: send data to node[my_index/2], reduce, repeat: O(log n).
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simple way: send data to master and reduce there; will not scale as well: O(n)
complex way: send data to node[my_index/2], reduce, repeat: O(log n).