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In this paper, we present a detailed study of how to design efficient and scalable flow control mechanisms in MPI over the InfiniBand Architecture. Two of the central issues in flow control are performance and scalability in terms of buffer usage. We propose three different flow control schemes (hardware-based, user-level static and userlevel dynamic) and describe their respective design issues. We have implemented all three schemes in our MPI implementation over InfiniBand and conducteddoi:10.1109/ipdps.2004.1303193 dblp:conf/ipps/LiuP04 fatcat:kblzjellq5brrha4iophnrl75i