Parallel computing and quantum simulations/011

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Our goal was to investigate the suitability of parallel supercomputer architectures for Quantum Monte Carlo (QMC). Because QMC allows one to study the properties of ions and electrons in a solid, it has important applications to condensed matter physics, chemistry, and materials science. research plan was to Our specific 1. Adapt quantum simulation codes which were highly optimized for vector supercomputers to run on the Intel Hypercube and Thinking Machines CM--5. 2. Identify architectural bottlenecks in communication, floating point computation, and node memory. Determine scalability with number of nodes. 3. Identify algorithmic changes required to take advantage of current and ... continued below

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4 p.; Other: FDE: PDF; PL:

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Alder, B., LLNL March 1, 1998.

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Description

Our goal was to investigate the suitability of parallel supercomputer architectures for Quantum Monte Carlo (QMC). Because QMC allows one to study the properties of ions and electrons in a solid, it has important applications to condensed matter physics, chemistry, and materials science. research plan was to Our specific 1. Adapt quantum simulation codes which were highly optimized for vector supercomputers to run on the Intel Hypercube and Thinking Machines CM--5. 2. Identify architectural bottlenecks in communication, floating point computation, and node memory. Determine scalability with number of nodes. 3. Identify algorithmic changes required to take advantage of current and prospective architectures. We have made significant progress towards these goals. We explored implementations of the p4 parallel programming system and the Message Passing Interface (MPI) libraries to run ``world-line`` and ``determinant`` QMC and Molecular Dynamics simulations on both workstation clusters (HP, Spare, AIX, Linux) and massively parallel supercomputers (Intel iPSC1860, Meiko CS-2, BM SP-X, Intel Paragon). We addressed issues of the efficiency of parallelization as a function of distribution of the problem over the nodes and the length scale of the interactions between particles. Both choices influence he frequency of inter-node communication and the size of messages passed. We found that using the message-passing paradigm on an appropriate machine (e.g., the ntel iPSC/860) an essentially linear speedup could be obtained.

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4 p.; Other: FDE: PDF; PL:

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OSTI as DE98058744

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  • Other Information: PBD: 1 Mar 1998

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  • Other: DE98058744
  • Report No.: UCRL-CR--130237
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/292439 | External Link
  • Office of Scientific & Technical Information Report Number: 292439
  • Archival Resource Key: ark:/67531/metadc686312

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  • March 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 17, 2016, 3:17 p.m.

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Alder, B., LLNL. Parallel computing and quantum simulations/011, report, March 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc686312/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.