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Scientific computing has seen an immense growth in recent years. The Message Passing Interface (MPI) has become the de-facto standard for parallel programming model for distributed memory systems. As the system scale increases, application writers often try to increase the overlap of computation and communication. The MPI-2 standard expanded MPI to include one-sided communication semantics that has the potential for overlapping computation with communication. In this model synchronization between processes needs to be done explicitly to ensure completion before using the data. Fence is one of the mechanisms of providing such synchronization in the one-sided model.
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