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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,513 records · Page 84
All sourcesNASA NTRSDOE OSTI
DOE OSTI2015

Optimized Data Transfers Based on the OpenCL Event Management Mechanism

In standard OpenCL programming, hosts are supposed to control their compute devices. Since compute devices are dedicated to kernel computation, only hosts can execute several kinds of data transfers such as internode communication and file access. These data transfers require one host to simultaneously play two or more roles due to the need for collaboration between the host and devices. The codes for such data transfers are likely to be system-specific, resulting in low portability. Here, this article proposes an OpenCL extension that incorporates such data transfers into the OpenCL event management mechanism. Unlike the current OpenCL standard, the main thread running on the host is not blocked to serialize dependent operations. Hence, an application can easily use the opportunities to overlap parallel activities of hosts and compute devices. In addition, the implementation details of data transfers are hidden behind the extension, and application programmers can use the optimized data transfers without any tricky programming techniques. The evaluation results show that the proposed extension can use the optimized data transfer implementation and thereby increase the sustained data transfer performance by about 18% for a real application accessing a big data file.

97 MATHEMATICS AND COMPUTING↗
DOE OSTI2016

Far-infrared tangential interferometer/polarimeter design and installation for NSTX-U

The Far-infrared Tangential Interferometer/Polarimeter (FIReTIP) system has been refurbished and is being reinstalled on the National Spherical Torus Experiment-Upgrade (NSTX-U) to supply real-time line-integrated core electron density measurements for use in the NSTX-U plasma control system (PCS) to facilitate real-time density feedback control of the NSTX-U plasma. Inclusion of a visible light heterodyne interferometer in the FIReTIP system allows for real-time vibration compensation due to movement of an internally mounted retroreflector and the FIReTIP front-end optics. Real-time signal correction is achieved through use of a National Instruments CompactRIO field-programmable gate array.

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
DOE OSTI2014

PyTrilinos

PyTrilinos is a Python interface to selected Trilinos packages. This makes Trilinos linear algebra classes, linear solvers, preconditioners, nonlinear solvers, eigensolvers, and tools available to Python programmers. This broadens the user base of Trilinos, and facilitates rapid prototyping of scientific codes and interactive manipulation of large, distributed data sets.

Spotz, William↗
DOE OSTI2016

CoMD Implementation Suite in Emerging Programming Models

CoMD-Em is a software implementation suite of the CoMD [4] proxy app using different emerging programming models. It is intended to analyze the features and capabilities of novel programming models that could help ensure code and performance portability and scalability across heterogeneous platforms while improving programmer productivity. Another goal is to provide the authors and venders with some meaningful feedback regarding the capabilities and limitations of their models. The actual application is a classical molecular dynamics (MD) simulation using either the Lennard-Jones method (LJ) or the embedded atom method (EAM) for primary particle interaction. The code can be extended to support alternate interaction models. The code is expected ro run on a wide class of heterogeneous hardware configurations like shard/distributed/hybrid memory, GPU's and any other platform supported by the underlying programming model.

Haque, Riyaz↗
DOE OSTI2016

FASTQ quality control dashboard

FQCDB builds up existing open source software, FastQC, implementing a modern web interface for across parsed output of FastQC. In addition, FQCDB is extensible as a web service to include additional plots of type line, boxplot, or heatmap, across data formatted according to guidelines. The interface is also configurable via more readable JSON format, enabling customization by non-web programmers.

Source record↗
DOE OSTI2016

rsed

"rsed" is an R package that contains tools for stream editing: manipulating text files by making insertions, replacements, deletions, substitutions, or commenting. It hails from the powerful Unix command, "sed". While the "rsed" package is not nearly as powerful as "see", it is much simpler to use. R programmers often write scripts that may require simple manipulation of text files. "rsed" addresses that need.

Source record↗
DOE OSTI2016

IonControl v. 1.0

The IonControl software is a set of python scripts and Field-Programmable-Gate-Array (FPGA) code designed to control a trapped ion research experiment. It enables one to generate the pulses (time resolution: 20ns) necessary to control the quantum states of trapped ions and allows one to collect and analyze measurement results from trapped ion systems.

Maunz, Peter↗
DOE OSTI2018

Very Low Overhead Transparent Multilevel

VeloC: Very Low Overhead Transparent Multilevel Checkpoint/Restart. The VeloC software suite will be a multilevel checkpoint/restart interface and implementation for exascale applications. VeloC will have three major impacts. It will: (1) optimize checkpoint/restart perfonnance for applications and workflows (2) increase programmer productivity by dramatically reducing the difficulty of handling varied and complex storage architectures and the need for performance/reliability optimizations. (3) benefit a wide community. VeloC is a collaboration between LLNL and ANL as part of the Exascale Computing Project.

Moody, Adam↗
DOE OSTI2017

Metamesh, Version 1.0

Metamesh is a general-purpose C++ language library for creating data structures that represent meshes. An important difference between Metamesh and other "mesh" libraries is that Metamesh does not provide a specific mesh format, in the usual sense, or tools or a GUI by which users build specific meshes. Rather, it provides a mechanism by which mesh formats themselves can be built, based on their constituent parts and the relationships between them.Consider that a mesh in up to three space dimensions can, in principle, contain nodes (0d entities, or points), edges (1d entities), faces (2d entities), and cells (3d, or volumetric, entities). A node might be defined in terms of (x), (x,y), or (x,y,z) in Cartesian coordinates; or perhaps something else, in a different coordinate system. An edge is typically defined from two nodes; say, "edge E goes from node A=(ax,ay) to node B=(bx,by)." Faces can reasonably be defined in terms of nodes or edges, and cells in terms of nodes, edges, or faces. Note also that someone might wish to support general faces or cells, or only specific variants - say, triangular faces and tetrahedral cells, or quadrilateral faces and hexahedral cells. Or, perhaps, both triangular and quadrilateral faces (but no others), with prisms for each cell. Consider also that a mesh can have the same or a lesser dimension than that of its enclosing space. In 3d, for example, one could have a full 3d mesh, a 2d "sheet" mesh with no cells, a 1d "parametrized curve" with neither faces nor cells, or even a 1d "point cloud." And, in addition to defining a mesh scheme, a user might wish to place additional data onto one or more mesh entities. Imagine, for example, a velocity at each node, a flux across each edge or face, and a mass or average density per cell. Metamesh supports all of this, through the use of C++ class and function templates, and template metaprogramming techniques. Programmers begin with constructs that Metamesh provides (or, users can define their own), and assemble them in particular ways in order to create particular mesh formats. Metamesh then provides functionality automatically to meshes that are constructed in this manner. Finally, Metamesh provides very general functions for spinning, extruding, visualizing, and performing input/output of whatever meshes a user builds with it.

Staley, Martin↗
DOE OSTI2018

SolTrace™ (Optical Analysis Software) [SWR-26-065 and SWR-01-45]

SolTrace™ is a software tool developed at the National Renewable Energy Laboratory (NREL) to model concentrating solar power (CSP) systems and analyze their optical performance. Although ideally suited for solar applications, the code can also be used to model and characterize many general optical systems. The creation of the code evolved out of a need to model more complex solar optical systems than could be modeled with existing tools. SolTrace can be installed either using the official NREL packaged distribution or from source code at the SolTrace open source project website. NREL welcomes contributions from programmers to the simulation engine or to the interface and encourages interested persons to get involved. More information on contributing, compiling the source code, and license requirements is available on the project website.(https://www.nrel.gov/csp/soltrace.html). For details on integration with SAM, see the SAM website. (https://sam.nrel.gov/)

Wendelin, Tim↗
DOE OSTI2019

FPChecker

CUDA is the programming model used to program NVIDIA GPUs, which are widely used in DOE supercomputers. FPChecker allows programmers to detect and fix hidden exceptions in the floating-point computations that CUDA executes. When a floating-point exception occurs (e.g., division by zero), GPUs cannot catch these errors. FPChecker intercepts each floating-point operations (addition, subtraction, multiplication and division) and reports to users where exceptions occur (file and line of code).

Laguna Peralta, Ignacio↗
DOE OSTI2017

OpenMP 4.5 Validation and Verification Suite

OpenMP, a directive-based programming API, introduce directives for accelerator devices that programmers are starting to use more frequently in production codes. To make sure OpenMP directives work correctly across architectures, it is critical to have a mechanism that tests for an implementation's conformance to the OpenMP standard. This testing process can uncover ambiguities in the OpenMP specification, which helps compiler developers and users make a better use of the standard. We fill this gap through our validation and verification test suite that focuses on the offload directives available in OpenMP 4.5.

Pophale, SwaroopS↗
DOE OSTI2021

Qubit Control System (QubiC) v1.0

We design a modular FPGA (field-programmable gate array) based system called QubiC to control and measure a superconducting quantum processing unit. The system includes room temperature electronics hardware, FPGA gateware, and engineering software.

Huang, Gang↗
DOE OSTI2021

K_Road (KRoad)

KRoad is a 2-dimensional, lightweight, vehicle driver simulator that uses 3-dimensional vehicle driving model considerations, i.e. state-of-the-art friction models, and enables the driver to make control decisions with less computation time and programmer effort required than is with full-fidelity 3d simulators. KRoad is fully compatible with OpenAI gym, and contains a factored gym framework for composing gyms from various components (process, reward function, observation function, termination conditions, etc.). KRoad is additionally compatible with the RLlib distributed reinforcement learning environment, running under the Ray distributed python framework.

Tripp, CharlesEdison [National Renewable Energy La↗
DOE OSTI2016

P-Mart

P-Mart was designed specifically to allow cancer researchers to perform robust statistical processing of publicly available cancer proteomic datasets. To date an online statistical processing suite for proteomics does not exist. The P-Mart software is designed to allow statistical programmers to utilize these algorithms through packages in the R programming language as well as offering a web-based interface using the Azure cloud technology. The Azure cloud technology also allows the release of the software via Docker containers.

Source record↗
DOE OSTI2021

LBNL BPM Firmware (CAL-BPM) v1.0

CAL-BPM is the firmware code base of the Advanced Light Source (ALS) Beam Position Monitor (BPM) Field Programmable Gate Array (FPGA) based electronics.

Norum, William↗
DOE OSTI2021

Credibility Framework (CF) v.1.0

Credibility Framework provides tools such as PIRT (Phenomena Identification and Ranking Table) and PCMM (Predictive Capability Maturity Model) configurable by non-programmers through simple Excel spreadsheets for tailoring the credibility process to meet the needs of the analysis provider organizations, customers and regulatory agencies. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525. SAND2020-10230 M

Clay, RobertL.↗