Symmetric Rank-k Update on Clusters of Multicore Processors with SMPSs

Abstract. We investigate the use of the SMPSs programming model to leverage task parallelism in the execution of a message-passing imple-mentation of the symmetric rank-k update on clusters equipped with multicore processors. Our experience shows that the major difficulties to adapt the code to the MPI/SMPSs instance of this programming model are due to the usage of the conventional column-major layout of matri-ces in numerical libraries. On the other hand, the experimental results show a considerable increase in the performance and scalability of our solution when compared with the standard options based on the use of a pure MPI approach or a hybrid one that combines MPI/multi-threaded BLAS