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As the scale of parallel computing systems grows, the importance of collective I/O also increases because it provides the function of single file based parallel I/O. Collective I/O follows two-phase I/O scheme that consists of a data exchange phase and an I/O phase. The previous studies of collective I/O were usually related with improving the performance of each phase. Especially, Heuristic Node...
With the widespread use of multi-core processors, specialized applications requiring parallel processing can be run on general desktops. In this study, we measure and analyze the parallel performance of LAMMPS, a classical well-known molecular dynamics code, on single multi-core systems. In order to check the parallel efficiency on single machines, the various types of simulations with LAMMPS were...
As the number of nodes in high performance computing (HPC) systems increases, collective I/O becomes an important issue and I/O aggregators are the key factors in improving the performance of collective I/O. When an HPC system uses non-exclusive scheduling, a different number of CPU cores per node can be assigned for MPI jobs; thus, I/O aggregators experience a disparity in their workloads and communication...
As the number of processes in parallel applications increases, the importance of parallel I/O is also emphasized. Collective I/O is the specialized parallel I/O which provides the function of single-file-based parallel I/O. Collective I/O in popular message-passing interface (MPI) libraries follows a two-phase I/O scheme, in which the particular processes, namely I/O aggregators, perform important...
In this paper, we propose a modified parallel virtual file system that provides snapshot functionality. Because typical file systems are exposed to various failures, taking a snapshot is a good way to enhance the reliability of file systems. The PVFS, which is one of the famous parallel file systems deployed in cluster systems, is vulnerable to system failures or users?? mistakes; however, there is...
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