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The IBM Blue Gene/Q supercomputer has a 5D torus network where each node is connected to ten bi-directional links. In this paper we present techniques to optimize the MPI_Allreduce collective operation by building ten different edge disjoint spanning trees on the ten torus links. We accelerate summing of network packets with local buffers by the use of Quad(More)
Results of 131 consecutive operated patients with a displaced proximal humerus fracture: an analysis with more than two years follow-up Abstract Objective The purpose of this study is to determine the efficacy of the open reduction and fixation of a dislocated proximal humerus fracture with a locking plate, also evaluating the incidence of complications and(More)
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