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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
 | Gopalakrishnan, Ganesh | Overcoming extreme-scale reproducibility challenges through a unified, targeted, and multilevel toolset | Reproducibility, the ability to repeat program executions with the same numerical result or code behavior, is crucial for computational science and engineering applications. However, non-determinism in concurrency scheduling often hampers achieving this ability on high performance computing (HPC) sy... | 2013-01-01 | |
| 2 |
 | Pascucci, Valerio | Exploring performance data with boxfish | The growth in size and complexity of scaling applications and the systems on which they run pose challenges in analyzing and improving their overall performance. With metrics coming from thousands or millions of processes, visualization techniques are necessary to make sense of the increasing amount... | 2012-01-01 | |
| 3 |
 | Berzins, Martin | Parallel breadth first search on GPU clusters | Fast, scalable, low-cost, and low-power execution of parallel graph algorithms is important for a wide variety of commercial and public sector applications. Breadth First Search (BFS) imposes an extreme burden on memory bandwidth and network communications and has been proposed as a benchmark that m... | 2014-01-01 | |
| 4 |
 | Pascucci, Valerio | Characterization and modeling of PIDX parallel I/O for performance optimization | Parallel I/O library performance can vary greatly in re- sponse to user-tunable parameter values such as aggregator count, file count, and aggregation strategy. Unfortunately, manual selection of these values is time consuming and dependent on characteristics of the target machine, the underlying fi... | 2013-01-01 | |
| 5 |
 | Pascucci, Valerio | Exploring power behaviors and trade-offs of in-situ data analytics | As scientific applications target exascale, challenges related to data and energy are becoming dominating concerns. For example, coupled simulation workflows are increasingly adopting in-situ data processing and analysis techniques to address costs and overheads due to data movement and I/O. However... | 2013-01-01 | |
| 6 |
 | Gopalakrishnan, Ganesh | MAPPED: Predictive dynamic analysis tool for MPI applications | Abstract-Formal dynamic analysis of MPI programs is critically important since conventional testing tools for message passing programs do not cover the space of possible non-deterministic communication matches, thus may miss bugs in the unexamined execution scenarios. While modern dynamic verificati... | 2012-01-01 | |
| 7 |
 | Berzins, Martin | Systematic debugging methods for large-scale HPC computational frameworks | Parallel computational frameworks for high-performance computing are central to the advancement of simulation-based studies in science and engineering. Finding and fixing bugs in these frameworks can be time consuming. If left unchecked, these bugs diminish the amount of new science performed. A sys... | 2014-01-01 | |
| 8 |
 | Kirby, Robert Michael | Kirby research group | 2012 | ||
| 9 |
 | Kirby, Robert Michael | A scalable, efficient scheme for evaluation of stencil computations over unstructured meshes | Stencil computations are a common class of operations that appear in many computational scientific and engineering applications. Stencil computations often benefit from compile-time analysis, exploiting data-locality, and parallelism. Post-processing of discontinuous Galerkin (dG) simulation solutio... | 2013-01-01 | |
| 10 |
 | Berzins, Martin | Uintah hybrid task-based parallelism algorithm | Abstract-Uintah is a software framework that provides an environment for solving large-scale science and engineering problems involving the solution of partial differential equations. Uintah uses a combination of fluid-flow solvers and particle-based methods for solids, together with adaptive meshin... | 2012-01-01 | |
| 11 |
 | Pascucci, Valerio | Combining in-situ and in-transit processing to enable extreme-scale scientific analysis | With the onset of extreme-scale computing, I/O constraints make it increasingly difficult for scientists to save a sufficient amount of raw simulation data to persistent storage. One potential solution is to change the data analysis pipeline from a post-process centric to a concurrent approach based... | 2012-01-01 | |
| 12 |
 | Johnson, Christopher R. | Grid-enabling problem solving environments: a case study of SCIRun and NetSolve | Combining the functionality of NetSolve, a grid-based middleware solution, with SCIRun, a graphically-based problem solving environment (PSE), yields a platform for creating and executing grid-enabled applications. Using this integrated system, hardware and/or software resources not previously ac... | Grid computing; SCIRun; NetSolve; Problem solving environment; Numerical libraries; Parallel programming (Computer science) | 2001 |
| 13 |
 | Pascucci, Valerio | Efficient data restructuring and aggregation for I/O acceleration in PIDX | Hierarchical, multiresolution data representations enable interactive analysis and visualization of large-scale simulations. One promising application of these techniques is to store high performance computing simulation output in a hierarchical Z (HZ) ordering that translates data from a Cartesian ... | 2012-01-01 | |
| 14 |
 | Freire, Juliana; Silva, Claudio T. | Provenance for visualizations: reproducibility and beyond | The demand for the construction of complex visualizations is growing in many disciplines of science, as users are faced with ever increasing volumes of data to analyze. The authors present VisTrails, an open source provenance-management system that provides infrastructure for data exploration and ... | Provenance management; Reproducibility; VisTrails; Pipelines | 2007-09 |
| 15 |
 | Berzins, Martin | A survey of high level frameworks in block-structured adaptive mesh refinement packages | Over the last decade block-structured adaptive mesh refinement (SAMR) has found increasing use in large, publicly available codes and frameworks. SAMR frameworks have evolved along different paths. Some have stayed focused on specific domain areas, others have pursued a more general functionality, p... | 2014-01-01 | |
| 16 |
 | Gopalakrishnan, Ganesh | Efficient search for inputs causing high floating-point errors | Tools for floating-point error estimation are fundamental to program understanding and optimization. In this paper, we focus on tools for determining the input settings to a floating point routine that maximizes its result error. Such tools can help support activities such as precision allocation, p... | 2014-01-01 | |
| 17 |
 | Freire, Juliana; Silva, Claudio T. | Enabling advanced visualization tools in a web-based simulation monitoring system | Simulations that require massive amounts of computing power and generate tens of terabytes of data are now part of the daily lives of scientists. Analyzing and visualizing the results of these simulations as they are computed can lead not only to early insights but also to useful knowledge that ca... | Isosurfaces; Contour tree; Turbulent combustion; eSimMon | 2009-12 |
| 18 |
 | Berzins, Martin | Investigating applications portability with the Uintah DAG-based runtime system on PetaScale supercomputers | Present trends in high performance computing present formidable challenges for applications code using multicore nodes possibly with accelerators and/or co-processors and reduced memory while still attaining scalability. Software frameworks that execute machine-independent applications code using a ... | 2013-01-01 | |
| 19 |
 | Pascucci, Valerio | Mapping applications with collectives over sub-communicators on torus networks | The placement of tasks in a parallel application on specific nodes of a supercomputer can significantly impact performance. Traditionally, this task mapping has focused on reducing the distance between communicating tasks on the physical network. This minimizes the number of hops that point-to-point... | 2012-01-01 | |
| 20 |
 | Gopalakrishnan, Ganesh; Kirby, Robert Michael II | A survey of MPI related debuggers and tools | Message Passing Interface is a widely used standard in the High Performance and Scienti c Computing Community for writing programs that can exploit the capability of parallel platforms. However, the inherent complexity and the size of the communication standard have made it difficult for programm... | Message Passing Interface; MPI; Debuggers | 2007 |
| 21 |
 | Freire, Juliana; Silva, Claudio T. | Scientific exploration in the era of ocean observatories | Society's critical and urgent need to better understand the world's oceans is amply documented and has led to a unique convergence of operational and scientific interests in the US, organized around the concept of ocean observatories: cyber-facilitated integrations of observations, simulations, a... | Ocean observatories; Provenance | 2008-05 |
| 22 |
 | Parker, Steven G. | Massively parallel software rendering for visualizing large-scale data sets | For some time, researchers have done production visualization almost exclusively using high-end graphics workstations. They routinely archived and analyzed the outputs of simulations running on massively parallel supercomputers. Generally, a feature extraction step and a geometric modeling step t... | Parallel rendering; Volume rendering; Ray tracing; Isosurfacing | 2001 |
| 23 |
 | Humphrey, Alan Parker; Derrick, Christopher Glade; Gopalakrishnan, Ganesh | GEM: graphical explorer for MPI programs | Formal dynamic verification can complement MPI program testing by detecting hard-to-find concurrency bugs. In previous work, we described our dynamic verifier called ISP that can parsimoniously search the execution space of an MPI program while detecting important classes of bugs. One major limit... | GEM; Graphical explorer; MPI programs; Dynamic verification; Concurrency bugs | 2009 |
| 24 |
 | Freire, Juliana; Silva, Claudio T. | Provenance for computational tasks: a survey | The problem of systematically capturing and managing provenance for computational tasks has recently received significant attention because of its relevance to a wide range of domains and applications. The authors give an overview of important concepts related to provenance management, so that poten... | Provenance management; Computational tasks | 2008-05 |
| 25 |
 | Johnson, Christopher R.; Parker, Steven G.; Hansen, Charles D. | Interactive simulation and visualization | Most of us perform data analysis and visualization only after everything else is finished, which often means that we don't discover errors invalidating the results of our simulation until postprocessing. A better approach would be to improve the integration of simulation and visualization into the... | Computational steering; Interactive simulation; Isosurfaces | 1999 |