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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...
Coarray Fortran (CAF) is a parallel programming paradigm that extends Fortran for the partitioned global address space (PGAS) programming model at the language level. The current runtime implementations of CAF are mainly using MPI or GASNet as underlying communication components. MVAPICH2-X is a hybrid MPI+PGAS programming library with a Unified Communication Runtime (UCR) design. In this paper, the...
Virtualization has become a central role in HPC Cloud due to easy management and low cost of computation and communication. Recently, Single Root I/O Virtualization (SR-IOV) technology has been introduced for high-performance interconnects such as InfiniBand and can attain near to native performance for inter-node communication. However, the SR-IOV scheme lacks locality aware communication support,...
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...
Bandwidth estimation techniques seek to provide an accurate estimation of available bandwidth such that network applications can adjust their behavior accordingly. However, most current techniques were designed for wired networks and produce relatively inaccurate results and long convergence times on wireless networks where capacity can vary dramatically. This paper presents a new wireless bandwidth...
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