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Existing InfiniBand drivers require the communication buffers to be pinned in physical memory during communication. Most runtimes leave these buffers pinned until the end of the run. Such situation limits the swappable memory space for applications. To address these concerns, Mellanox has recently introduced the On-Demand Paging (ODP) feature for InfiniBand. With ODP, communication buffers are paged...
Noncontiguous data communication has been heavily adopted in scientific applications, especially for those written with MPI. Common strategies to handle noncontiguous data, like packing/unpacking, incur significant performance overhead during communication, which could become as a barrier of using MPI derived datatypes. Recently, a novel feature of Mellanox InfiniBand, called User-mode Memory Registration...
Increasing number of MPI applications are being ported to take advantage of the compute power offered by GPUs. Data movement on GPU clusters continues to be the major bottleneck that keeps scientific applications from fully harnessing the potential of GPUs. Earlier, GPU-GPU inter-node communication has to move data from GPU memory to host memory before sending it over the network. MPI libraries like...
In the last few years, small-cell technology has moved from the realm of academic research to large commercial networks with millions of deployed units. This paper discusses the challenges in deploying and maintaining a large-scale residential small-cell network. The paper first discusses the need for residential small cells to provide ubiquitous coverage in homes located in poor coverage areas of...
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