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In this paper, we address the problem of designing a distributed applicationmeant to run both classical and asynchronous iterations. MPI libraries are verypopular and widely used in the scientific community, however asynchronousiterative methods raise non-negligible difficulties about the efficientmanagement of communication requests and buffers. Moreover, a convergencedetection issue is introduced, which requires the implementation of one of thevarious state-of-the-art termination methods, which are not necessarily highlyreliable for most computational environments. We propose here an MPI-basedcommunication library which handles all these issues in a non-intrusive manner,providing a unique interface for implementing both classical and asynchronousiterations. Few details are highlighted about our approach to achieve bestcommunication rates and ensure accurate convergence detection. Experimentalresults on two supercomputers confirmed the low overhead communication costsintroduced, and the effectiveness of our library.

JACK2: a new high-level communication library for parallel iterative methods