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7 \title{A scalable multisplitting algorithm for solving large sparse linear systems}
12 \author{Raphaël Couturier \and Lilia Ziane Khodja}
18 In this paper we revist the krylov multisplitting algorithm presented in
19 \cite{huang1993krylov} which uses a scalar method to minimize the krylov
20 iterations computed by a multisplitting algorithm. Our new algorithm is simply a
21 parallel multisplitting algorithm with few blocks of large size and a parallel
22 krylov minimization is used to improve the convergence. Some large scale
23 experiments with a 3D Poisson problem are presented. They show the obtained
24 improvements compared to a classical GMRES both in terms of number of iterations
28 \section{Introduction}
30 Iterative methods are used to solve large sparse linear systems of equations of
31 the form $Ax=b$ because they are easier to parallelize than direct ones. Many
32 iterative methods have been proposed and adpated by many researchers. When
33 solving large linear systems with many cores, iterative methods often suffer
34 from scalability problems. This is due to their need for collective
35 communications to perform matrix-vector products and reduction operations.
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