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  • Electronic structure and strongly correlated systems  (5)
  • Computer Systems  (4)
  • Statistical Physics  (4)
  • Chemistry
  • Computer Operations and Hardware
  • 2010-2014  (14)
  • 11
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    An Application-Based Performance Evaluation of NASAs Nebula Cloud Computing Platform (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The high performance computing (HPC) community has shown tremendous interest in exploring cloud computing as it promises high potential. In this paper, we examine the feasibility, performance, and scalability of production quality scientific and engineering applications of interest to NASA on NASA's cloud computing platform, called Nebula, hosted at Ames Research Center. This work represents the comprehensive evaluation of Nebula using NUTTCP, HPCC, NPB, I/O, and MPI function benchmarks as well as four applications representative of the NASA HPC workload. Specifically, we compare Nebula performance on some of these benchmarks and applications to that of NASA s Pleiades supercomputer, a traditional HPC system. We also investigate the impact of virtIO and jumbo frames on interconnect performance. Overall results indicate that on Nebula (i) virtIO and jumbo frames improve network bandwidth by a factor of 5x, (ii) there is a significant virtualization layer overhead of about 10% to 25%, (iii) write performance is lower by a factor of 25x, (iv) latency for short MPI messages is very high, and (v) overall performance is 15% to 48% lower than that on Pleiades for NASA HPC applications. We also comment on the usability of the cloud platform.
    Keywords: Computer Systems
    Type: ARC-E-DAA-TN5169 , 14th IEEE International Conferenc eon HPCC-2012; Jun 25, 2012; Liverpool; United Kingdom
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 12
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    A Look at the Impact of High-End Computing Technologies on NASA Missions (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: From its bold start nearly 30 years ago and continuing today, the NASA Advanced Supercomputing (NAS) facility at Ames Research Center has enabled remarkable breakthroughs in the space agency s science and engineering missions. Throughout this time, NAS experts have influenced the state-of-the-art in high-performance computing (HPC) and related technologies such as scientific visualization, system benchmarking, batch scheduling, and grid environments. We highlight the pioneering achievements and innovations originating from and made possible by NAS resources and know-how, from early supercomputing environment design and software development, to long-term simulation and analyses critical to design safe Space Shuttle operations and associated spinoff technologies, to the highly successful Kepler Mission s discovery of new planets now capturing the world s imagination.
    Keywords: Computer Systems
    Type: ARC-E-DAA-TN4714
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    Performance Analysis of Scientific and Engineering Applications Using MPInside and TAU (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this paper, we present performance analysis of two NASA applications using performance tools like Tuning and Analysis Utilities (TAU) and SGI MPInside. MITgcmUV and OVERFLOW are two production-quality applications used extensively by scientists and engineers at NASA. MITgcmUV is a global ocean simulation model, developed by the Estimating the Circulation and Climate of the Ocean (ECCO) Consortium, for solving the fluid equations of motion using the hydrostatic approximation. OVERFLOW is a general-purpose Navier-Stokes solver for computational fluid dynamics (CFD) problems. Using these tools, we analyze the MPI functions (MPI_Sendrecv, MPI_Bcast, MPI_Reduce, MPI_Allreduce, MPI_Barrier, etc.) with respect to message size of each rank, time consumed by each function, and how ranks communicate. MPI communication is further analyzed by studying the performance of MPI functions used in these two applications as a function of message size and number of cores. Finally, we present the compute time, communication time, and I/O time as a function of the number of cores.
    Keywords: Computer Operations and Hardware
    Type: ARC-E-DAA-TN1911 , 12th IEEE HPCC conference; Sep 01, 2010 - Sep 03, 2010; Melbourne; Australia
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    NASA Advanced Computing Environment for Science and Engineering (2014)
    In:  CASI
    Details
    Publication Date: 2019-11-16
    Description: High-fidelity modeling, simulation, and analysis, enabled by supercomputing, are becoming increasingly important to NASAs broad spectrum of missions. This paper describes NASAs advanced supercomputing environment at Ames Research Center that is geared toward solving the space agencys most challenging science and engineering problems.
    Keywords: Computer Systems
    Type: ARC-E-DAA-TN15006 , International Conference on Parallel Computational Fluid Dynamics Parallel; May 20, 2014 - May 22, 2014; Trondheim; Norway
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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