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A spherical polygon intersection library for climate tracer transport algorithms
October 1, 2016 • Substantial and ongoing improvements to coupled models of the Earth system have steadily increased our ability to assess future global climate change. Providing quantified predictions of the impacts of global climate change on regional scales and human systems requires advanced global models that resolve multiple spatial scales, capture missing processes,...
An example of a nonconvex, self-intersecting polygon (red) clipped against a convex polygon (dashed blue) to form the green polygon. This kind of calculation is done at every cell of a mesh, at every time step of a simulation.

Evaluating the opportunities for multi-level memory
October 1, 2016 • 1420 researchers successfully completed a CSSE Level 2 milestone investigating the impact of next-generation multi-level memory hierarchies (i.e., hierarchies including multiple main memory technologies such as high-bandwidth memory and traditional DDR DRAM) on key ASC algorithms and kernels. The study found that while ASC applications vary widely in their ability...
HPCG performance with fraction of data footprint fitting in high bandwidth memory for various software-managed memory policies.

New ARIA Linear Solver for Coupled Multiphysics Flows
October 1, 2016 • A new multigrid linear solver has been developed and deployed for ARIA, a finite element analysis code for the solution of coupled multiphysics problems.  The new linear solver specifically addresses challenges associated with PDE simulations where the number of degrees-of-freedom at each mesh node varies. This scenario frequently arises within...
X direction velocities for a rising bubble calculation employing the new solver

Performance Portable Sparse Matrix-Matrix Multiplication is significantly faster than vendor provided libraries
October 1, 2016 • Sandia researchers developed a new algorithm for a performance-portable sparse matrix-matrix multiplication kernel in the KokkosKernels package. This new kernel is thread scalable, and memory-efficient in comparison to other publicly available implementations. It also optimizes for use cases from Sandia applications, such as reusing the symbolic structure of the problems...
Results showing that KokkosKernels' sparse matrix-matrix multiplication achieves higher GFLOPS rates than cuSPARSE on a K80 GPU for matrices from multigrid methods

Trinity Program Pursuing “Power-Aware Scheduling” Through Contract with Adaptive Computing
October 1, 2016 • The Trinity project has placed a new “Non-Recurring Engineering” contract with Adaptive Computing to develop “Power-Aware Scheduling” capabilities for the Trinity supercomputer, which when fully installed will consume 8-10 megawatts (MW) and have a peak computational capability of more than 40 petaflops.  This work will enable power to be managed...
Notional framework for power-aware scheduling. In order to maximize the benefit derived from a system-level power budget of 20 MW, the workload manager allocates power to jobs based on historical and real-time power usage information obtained from the power usage database.

ECP/HT PathForward RFP
September 1, 2016 • On June 16, 2016 the DOE Exascale Computing Project issued a RFP for Vendor node and system design R&D projects. Proposals were received on July 18, 2016.  The PathForward RFP seeks hardware node and system design solutions that will improve application performance and developer productivity while maximizing energy efficiency and...

GazeAppraise team nominated for federal labs consortium notable technology development award
September 1, 2016 • Overview Experienced professionals, whether in security or medicine, are great at pattern recognition and spotting irregularities as they scan images, but can be overwhelmed by the volume of data, especially in rapidly changing and high-stress environments. New products have been developed to assist workers, but it’s unclear that these products...

GazeAppraise Team Receives Notable Technology Development Award
September 1, 2016 • Technology Development Award: Sandia’s GazeAppraise team received a Notable Technology Development award from the Federal Laboratory Consortium (FLC) on Technology Transfer, Mid-Continent Region. The award for GazeAppraise Eye Movement Analysis Software was presented at the annual FLC regional meeting in Albuquerque, September 13-15, 2016. The Mid-Continent region includes 15 states....
Sandia Researcher Mike Haass demonstrates how an eye tracker under a computer monitor is calibrated to capture his eye movements on the screen.

On-node Resource Management for Supercomputers
September 1, 2016 • Researchers at Sandia National Laboratories are designing an integrated approach to resource management on the supercomputer node. Increasingly complex DOE applications and associated libraries create the problem of too many software components competing for shared on-node resources – system memory and processor cores on which to execute. Our resource management...
Lifecycle of Supercomputer Node Resources

Ray Tuminaro Co-Organized Fourteenth Copper Mountain Conference on Iterative Methods
September 1, 2016 • Sandia co-sponsored and helped organize the most recent Copper Mountain Conference on Iterative Methods, an event that examined numerical analysis issues associated with linear algebraic approaches to numerical PDEs and data/graph analysis. The co-chairs for the conference were Ray Tuminaro (Sandia) and Michele Benzi (Emory). This prominent conference drew some...

Refactored I/O Emulation Framework To Enable Customized Mini-app Generation
September 1, 2016 • Researchers at Sandia are actively investigating methods to develop better understanding of the I/O performance characteristics of SIERRA applications, both to provide guidance for current application deployments and to help prepare for migrations to future hardware and software platforms. The MiniIO C++ programming framework has recently been refactored to provide...

Sandians organize IMA Workshop “Frontiers in PDE-constrained Optimization”
September 1, 2016 • Sandia researchers Drew Kouri (1441) and Denis Ridzal (1441) organized a five-day workshop on "Frontiers in PDE-constrained Optimization" at the Institute for Mathematics and Its Applications (IMA), in collaboration with Harbir Antil (George Mason University) and Martin Lacasse (ExxonMobil).  The workshop brought together practitioners of PDE-constrained optimization from different disciplines,...

1460 researchers awarded contract to provide test and evaluation for IARPA MICrONS Program
September 1, 2016 • 1460 researchers recently won a contract to provide test and evaluation support for a new IARPA program: Machine Intelligence from Cortical Networks (MICrONS).  The MICrONS program aims to advance a new generation of neural-inspired machine learning algorithms by reverse engineering the algorithms and computations of the brain.  The Sandia team’s...

Multi-threaded MPI Remote Memory Mini-applications at Scale
July 1, 2016 • ACES researchers have used mini-applications utilizing next generation communication techniques, remote memory access with multi-threading, the only RMA-MT mini-applications currently available and demonstrated their performance at full scale on Trinity. Initial results are promising and are scaling well. Improvements have been made to Open MPI in response to these mini-applications...
RMA-MT mini-app run time overhead compared to traditional send/recv

High-Accuracy Calculations of 2-D Semiconductor, Phosphorene
May 1, 2016 • Luke Shulenburger (1641) and Andrew Baczewski (1425) Recently, we published work in Nano Letters (Impact Factor 13.592) detailing the results of quantum Monte Carlo (QMC) calculations from our BES-funded investigation of the properties of phosphorene, a single-layer form of black phosphorus [1]. Black phosphorus is a layered form of phosphorus...
Left: Charge reorganization induced by interaction of black phosphorus layers. Right: Large qualitative differences in charge transfer between DFT predictions and QMC (red).

Joint Position in Scalable Computing R&D with UNM
May 1, 2016 • The Center for Computing Research (CCR) is pleased to announce a job opening for a joint position with the University of New Mexico (UNM) in Scalable Computing R&D. The CCR seeks qualified candidates to help establish a strong collaboration with UNM in the area of Scalable Computing research and development....
University of New Mexico - Sandia National Laboratories Logo

Memristor Simulator Aids Synthesis of Efficient Devices
May 1, 2016 • Denis Mamaluy (1425) and Xujiao (Suzey) Gao (1355) Memristors are variable resistors that can be adjusted, reversibly, by applied current.  They are one of the strongest candidates to replace flash memory, and possibly DRAM and SRAM in the nearest future. Memristors also have a high potential as a beyond-CMOS technology...
Simulation of hysteretic response in a prototype TaOx memristor device. Produced using the new memristor capability in Sandia’s Charon 2.0 TCAD code by self-consistently solving drift, diffusion and heat equations for multiple charged species.

A Lightweight Trilinos Solver Interface for Fortran-Based Multiphysics Applications
April 1, 2016 • Sandia researchers have previously developed a lightweight interface software layer that makes linear solvers from the Sandia Trilinos project accessible to the Fortran-based multiphase flow solver suite named MFIX (https://mfix.netl.doe.gov), originally developed by the National Energy Technology Laboratory (NETL).  Under a current Office of Fossil Energy project named "MFIX-DEM Phi",...
Source: Visualizations prepared by Aytekin Gel & OLCF Visualization Support for Commercial Scale Gasifier Simulations with MFIX as part of INCITE award to NETL (2010) https://mfix.netl.doe.gov/results.php#commercialscalegasifier

A new optimization-based mesh correction method with volume and convexity constraints.
April 1, 2016 • Mesh motion is at the core of many numerical methods for time dependent flow and structure problems.  Examples include Lagrangian hydrodynamics methods, in which the mesh evolves with time in order to track deformations of the problem domain, and the related Arbitrary Lagrangian-Eulerian methods, which incorporate a mesh rezoning step...
For a divergence free velocity field, superimposition of the mesh obtained with “exact” movement (cells are shaded with different shades of grey) and the mesh obtained without volume correction (Figure 1) and the one with volume correction (Figure 2); the latter is in much closer agreement with the exact mesh than the uncorrected mesh.

A new, optimization-based coupling strategy for nonlocal and local diffusion models
April 1, 2016 • The use of nonlocal models in science and engineering applications has been steadily increasing over the past decade. The ability of nonlocal theories to accurately capture effects that are difficult or impossible to represent by local partial differential equation (PDE) models motivates and drives the interest in a wide range...
Simulation of a bar containing a discontinuity. The discontinuity extends vertically from the top of the bar halfway through the height of the bar. Dirichlet boundary conditions are applied to the ends of the bar (local domain), circumventing the need to prescribe volume constraints in the nonlocal domain.

Aeras Project Develops Next-Generation Atmosphere Model
April 1, 2016 • The goal of the Aeras LDRD project is to develop a next-generation atmosphere model suitable for a global climate model, with advanced capabilities such as performance portability and embedded uncertainty quantification (UQ). Performance portability will allow us to run our code very efficiently on a diverse set of current and...
Timings for Aeras finite element assembly of the shallow water equations on serial, threaded (using OpenMP), and GPU (using CUDA) architectures. Note that these three implementations were achieved with a single piece of code enabled by the Kokkos package and programming model. Figure (a) represents total finite element assembly time, while (b) isolates the computational time by removing copy times to and from the device.

Cindy Phillips Named as New Fellow of SIAM
April 1, 2016 • Sandia researcher Cindy Phillips has been selected as a Fellow by the Society for Industrial and Applied Mathematics (SIAM), the leading professional organization for applied and computational mathematicians.  Cindy was recognized for “Contributions to the theory and applications of combinatorial optimization.” Selection as a SIAM fellow is an honor the...
Sandia researcher Cindy Phillips has been selected as a Fellow by the Society for Industrial and Applied Mathematics (SIAM), the leading professional organization for applied and computational mathematicians.
Results 76–100 of 125