Daniel Sunderland

Universidad del Noreste

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Harold Edwards

Marshall University

Christian Robert Trott

Sandia National Laboratories

Mark Frederick Hoemmen

Sandia National Laboratories California

Sam Mish

Sandia National Laboratories California

David S Hollman

Sandia National Laboratories California

Chris Amsler

Kansas State University

Alan Humphrey

University of Utah

Martin Berzins

University of Utah

Vicki Porter

University of British Columbia

Patrick Xavier

Sandia National Laboratories

Cooperative Institutions

Sandia National Laboratories California

Sandia National Laboratories

Office of Scientific and Technical Information

Oak Ridge National Laboratory

National Technical Information Service

Lawrence Berkeley National Laboratory

Michigan State University

Nvidia (United States)

Lawrence Livermore National Laboratory

Los Alamos National Laboratory

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An overview of performance portability in the uintah runtime system through the use of kokkos

Daniel Sunderland Brad Peterson John Schmidt Alan Humphrey Jeremy N. Thornock

The current diversity in nodal parallel computer architectures is seen in machines based upon multicore CPUs, GPUs and the Intel Xeon Phi's. A class of approaches for enabling scalability of complex applications on such architectures is based upon Asynchronous Many Task software architectures such as that in the Uintah framework used for the parallel solution of solid and fluid mechanics problems. Uintah has both an applications layer with its own programming model and a separate runtime system. While Uintah scales well today, it is necessary to address nodal performance portability in order for it to continue to do. Incrementally modifying Uintah to use the Kokkos performance portability library through prototyping experiments results in improved kernel performance by more than a factor of two.

Software portability

Xeon Phi

Multi-core processor

Kernel (algebra)

Runtime system

10.5555/3018814.3018822

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Citations (7)

A Bayesian Audit Assurance Model Incorporating Monetary Unit Sampling

SSRN Electronic Journal (2024)

Trevor Stewart Daniel Sunderland

The process for obtaining reasonable audit assurance described by modern auditing standards—iteratively updating subjective professional judgement for new evidence—is essentially Bayesian. Recognizing it as such unlocks a box of tools and techniques for modeling audit assurance, designing targeted audit procedures, and updating the model for the results. We describe such a model and focus on its interrelationship with monetary unit sampling. The model arises naturally as a generalization of the familiar audit risk model, fully integrates sampling results into the overall assurance profile, has intuitive auditor appeal, and is technically easy to implement for field deployment. We show how two audit judgments serve to uniquely identify an appropriate prior, how a third fixes the target posterior, and how sample sizes are derived via Bayes' rule. We introduce the concept of the Stringer posterior, a Bayesian adaptation of the Stringer bound familiar from the monetary unit sampling literature.

10.2139/ssrn.4817734

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mdspan in C++: A Case Study in the Integration of Performance Portable Features into International Language Standards

David S Hollman Bryce Adelstein Lelbach Harold Edwards Mark Frederick Hoemmen Daniel Sunderland

Multi-dimensional arrays are ubiquitous in high-performance computing (HPC), but their absence from the C++ language standard is a long-standing and well-known limitation of their use for HPC. This paper describes the design and implementation of mdspan, a proposed C++ standard multidimensional array view (planned for inclusion in C++23). The proposal is largely inspired by work done in the Kokkos project---a C++ performance-portable programming model deployed by numerous HPC institutions to prepare their code base for exascale-class supercomputing systems. This paper describes the final design of mdspan after a five-year process to achieve consensus in the C++ community. In particular, we will lay out how the design addresses some of the core challenges of performance-portable programming, and how its customization points allow a seamless extension into areas not currently addressed by the C++ Standard but which are of critical importance in the heterogeneous computing world of today's systems. Finally, we have provided a production-quality implementation of the proposal in its current form. This work includes several benchmarks of this implementation aimed at demonstrating the zero-overhead nature of the modern design.

Code (set theory)

10.1109/p3hpc49587.2019.00011

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Citations (10)

WBS STPR 04 Milestone 4 Report

Daniel Sunderland Mark Frederick Hoemmen Christian Robert Trott

This report documents the completion of milestone STPRO4-4 Kokkos back-ends research, collaborations, development, optimization, and documentation. The Kokkos team updated its existing backend to support the software stack and hardware of DOE's Sierra, Summit and Astra machines. They also collaborated with ECP PathForward vendors on developing backends for possible exa-scale architectures. Furthermore, the team ramped up its engagement with the ISO/C++ committee to accelerate the adoption of features important for the HPC community into the C++ standard.

Milestone

Summit

10.2172/1481608

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Publikacje pracowników Instytutu Historii Nauki PAN w 2018 roku

Kwartalnik Historii Nauki i Techniki (2019)

Daniel Sunderland

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Portable Manycore Sparse Linear System Assembly Algorithms and Performance Tradeoffs.

Harold Edwards Daniel Sunderland

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V&V of Behavioral Models.

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2010)

Arlo Leroy Ames Daniel Sunderland

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Manycore Performance-Portability: Kokkos Multidimensional Array Library

DOAJ (DOAJ: Directory of Open Access Journals) (2012)

Harold Edwards Daniel Sunderland Vicki Porter Chris Amsler Sam Mish

Software portability

10.3233/spr-2012-0343

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Citations (10)

Psychrobacter arcticus Cold Shock Protein Expression in Escherichia coli Increases Cold Resistance

Daniel Sunderland

Cold-shock domain

Source

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Root Cause Analysis Research Framework Mapping Auditing Judgment and Decision Making Research to Root Cause Analysis of Auditing Deficiencies in Practice – A Way Forward

SSRN Electronic Journal (2021)

Christine J. Nolder Daniel Sunderland

Firms are required to establish systems around identifying and remediating root causes of auditing deficiencies (IAASB 2020; PCAOB 2019; SOX 2002). Since most audit firm personnel involved in RCA are not trained in the scientific investigation of auditors’ judgments and decisions, the objective of our study is to provide a theoretical framework to facilitate doing so and to identify important areas of future research that can inform root cause analysis efforts in practice. The insights derived from our Root Cause Analysis Research Framework allow auditing JDM researchers to quickly understand how their past and future research may inform RCA efforts in practice. Moreover, tethering the Framework to the Heuristic-Systematic Model (Chaiken 1980) narrows the focus of root cause investigations and increases the likelihood that researchers identify the correct causes and ultimately, increases the likelihood that the choice of a remediation strategy (e.g., a capacity increasing vs motivating strategy) will be effective.

Root Cause Analysis

Root (linguistics)

Operational auditing

10.2139/ssrn.3911302

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