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ieee International symposium on Performance Analysis of Systems and Software (ISPASS)

作者： Lamarche-Perrin, Robin Schnorr, Lucas Mello Vincent, Jean-Marc Demazeau, Yves Univ Grenoble Alpes Lab Informat Grenoble Grenoble France CNRS Lab Informat Grenoble F-75700 Paris France

ISBN: (纸本)9781479936069

Performance analysis through visualization techniques usually suffers semantic limitations due to the size of parallel applications. Most performance visualization tools rely on data aggregation to work at scale, without any attempt to evaluate the loss of information caused by such aggregations. This paper proposes a technique to evaluate the quality of aggregated representations - using measures from information theory - and to optimize such measures in order to build consistent multiresolution representations of large execution traces.

关键词： Distributed Systems visualization information loss unified retrieval models Information Theory representations

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Portable and Composable Flow Graphs for In Situ Analytics 11

Portable and Composable Flow Graphs for In Situ Analytics

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ieee 11th symposium on large data Analysis and visualization (LDAV)

作者： Shudler, Sergei Petruzza, Steve Pascucci, Valerio Bremer, Peer-Timo Lawrence Livermore Natl Lab Livermore CA 94550 USA Utah State Univ Logan UT 84322 USA Univ Utah Salt Lake City UT 84112 USA

ISBN: (纸本)9781665432832

Existing data analysis and visualization algorithms are used in a wide range of simulations that strive to support an increasing number of runtime systems. The BabelFlow framework has been designed to address this situation by providing users with a simple interface to implement analysis algorithms as dataflow graphs portable across different runtimes. The limitation in BabelFlow, however, is that the graphs are not easily reusable. Plugging them into existing in situ workflows and constructing more complex graphs is difficult. In this paper, we introduce LegoFlow, an extension to BabelFlow that addresses these challenges. Specifically, we integrate LegoFlow into Ascent, a flyweight framework for large scale in situ analytics, and provide a graph composability mechanism. This mechanism is an intuitive approach to link an arbitrary number of graphs together to create more complex patterns, as well as avoid costly reimplementations for minor modifications. Without sacrificing portability, LegoFlow introduces complete flexibility that maximizes the productivity of in situ analytics workflows. Furthermore, we demonstrate a complete LULESH simulation with LegoFlow-based in situ visualization running on top of Charm++. It is a novel approach for in situ analytics, whereby the asynchronous tasking runtime allows routines for computation and analysis to overlap. Finally, we evaluate a number of LegoFlow-based filters and extracts in Ascent, as well as the scaling behavior of a LegoFlow graph for Radix-k based image compositing.

关键词： Software and its engineering data flow architectures Human-centered computing visualization Scientific visualization

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Proceedings - 2023 ieee 16th Pacific visualization symposium, PacificVis 2023

Proceedings - 2023 IEEE 16th Pacific Visualization Symposium...

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16th ieee Pacific visualization symposium, PacificVis 2023

ISBN: (纸本)9798350321241

The proceedings contain 26 papers. The topics discussed include: understanding people’s needs in viewing diverse social opinions about controversial topics;a study of zooming, interactive lenses and overview+detail techniques in collaborative map-based tasks;parallel assemblies plot, a visualization tool to explore categorical and quantitative data: application to digital mobility outcomes;an empirical guide for visualization consistency in multiple coordinated views;visualizing interaction networks and evidence in biomedical corpora;efficient raycasting of volumetric depth images for remote visualization of large volumes at high frame rates;investigating animal infectious diseases with visual analytics;interactive transformations and visual assessment of noisy event sequences: an application in en-route air traffic control;and a visual analytics inspired approach to correlate and understand multiple mechanical tensor fields.

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Conformal visualization for Partially-Immersive Platforms

Conformal Visualization for Partially-Immersive Platforms

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ieee Virtual Reality Conference (VR)

作者： Petkov, Kaloian Papadopoulos, Charilaos Zhang, Min Kaufman, Arie E. Gu, Xianfeng SUNY Stony Brook Dept Comp Sci Stony Brook NY 11794 USA

ISBN: (纸本)9781457700361

Current VR systems such as the CAVE provide an effective platform for the immersive exploration of large 3D data. A major limitation is that in most cases at least one display surface, such as a ceiling or a back wall, is missing due to space, access or cost constraints. This partially-immersive visualization results in a substantial loss of visual information that may be acceptable for some applications;however, it becomes a major obstacle for critical tasks that need to utilize the users' entire field of vision. We have developed a conformal rendering pipeline for the visualization of datasets on partially-immersive platforms. The angle-preserving conformal mapping approach is used to render the 360. view directly onto arbitrary display configurations. It has the desirable property of preserving shapes locally, which is important for identifying shape-based features in the data. Our conformal visualization technique is applicable to rasterization, volume rendering and real-time raytracing, and in contrast to image-based retargeting approaches, it constructs accurate, artifact-free stereoscopic images. We demonstrate our conformal visualization pipeline in the 5-sided CAVE for Immersive Virtual Colonoscopy, as well as architectural and abstract data exploration. Our user study shows that on the visual polyp detection task, conformal visualization leads to improved sensitivity at comparable examination times against the traditional rendering approach.

关键词： I.3.3 [Computer graphics]: Picture/Image GenerationDisplay Algorithms I.3.7 [Computer graphics]: Three-Dimensional graphics and RealismVirtual Reality

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parallel IMPLEMENTATION OF VERTEX COMPONENT ANALYSIS FOR HYPERSPECTRAL ENDMEMBER EXTRACTION

PARALLEL IMPLEMENTATION OF VERTEX COMPONENT ANALYSIS FOR HYP...

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ieee International Geoscience and Remote Sensing symposium (IGARSS)

作者： Rodriguez Alves, Jose M. Nascimento, Jose M. P. Bioucas-Dias, Jose M. Silva, Vitor Plaza, Antonio Inst Telecomunicacoes Lisbon Portugal

ISBN: (纸本)9781467311595

Vertex component analysis (VCA) has become a very popular and useful tool to linear unmix large hyperspectral datasets without the use of any a priori knowledge of the constituent spectra. Although VCA is fast method, many hyperspectral imagery applications require a response in real time or near-real time. This paper proposes two different optimizations for accelerating the computational performance of VCA: the first one focus a parallel implementation based on graphics computing units (GPUs) to alleviate the VCA computational burden;The second one is focused on the development of a strategy to remove a large proportion of mixed pixels that play no effect on the VCA functioning. Experiments are conducted using simulated and real hyperspectral datasets. These results reveal considerable acceleration factors, which satisfies the real-time constraints given by the data acquisition rate.

关键词： Hyperspectral Unmixing Endmember Extraction Vertex Component Analysis graphics Processing Unit parallel Methods

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EGPGV 2019 - 19th Eurographics symposium on parallel graphics and visualization

EGPGV 2019 - 19th Eurographics Symposium on Parallel Graphic...

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19th Eurographics symposium on parallel graphics and visualization, EGPGV 2019

ISBN: (纸本)9783038680796

The proceedings contain 12 papers. The topics discussed include: dynamic I/O budget reallocation for in situ wavelet compression;fast mesh validation in combustion simulations through in-situ visualization;scalable parallel flow visualization using 3D line integral convolution for large scale unstructured simulation data;task-based augmented Reeb Graphs with dynamic ST-trees;parallel XPBD simulation of modified morse potential - an alternative spring model;real-time particle-based snow simulation on the GPU;hybrid online autotuning for parallel ray tracing;screen partitioning load balancing for parallel rendering on a multi-GPU multi-display workstation;hybrid remote visualization in immersive virtual environments with Vistle;and an interpolation scheme for VDVP Lagrangian basis flows.

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A Study of the Locality of Persistence-Based Queries and Its Implications for the Efficiency of Localized data Structures 15

A Study of the Locality of Persistence-Based Queries and Its...

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ieee 15th Pacific visualization symposium (PacificVis)

作者： Klacansky, Pavol Gyulassy, Attila Bremer, Peer-Timo Pascucci, Valerio Univ Utah SCI Inst Salt Lake City UT 84112 USA LLNL Livermore CA USA

ISBN: (纸本)9781665423359

Scientific datasets are often analyzed and visualized using iso-surfaces. The connected components at or above the isovalue defining these isosurfaces are called superlevel-set components. The vertex set of these superlevel-set components can be used to compute local statistics, such as mean temperature or histogram per component, or to segment the data. However, in datasets produced by acquisition devices or simulations, noise induces many spurious components that clutter the visualization and analysis results. Many of these spurious components would disappear if the data values were slightly adjusted. The notion of persistence captures the stability of a component with respect to function value changes, and so we are interested in computing persistence quickly. Locality of computation is critical for parallel scalability, minimization of communication in a distributed environment, or an out-of-core processing. The recently introduced merge forest attained high performance by exploiting locality, thereby avoiding communication until needed to resolve a feature query. We extend the merge forest to support persistence-based queries and study the locality of these queries by evaluating the traversals of regions of data during a query. We confirm that the majority of evaluated datasets have the property that the noise is mostly local, and thus can be efficiently eliminated without performing a global analysis. Finally, we compare the query running times with those of a triplet merge tree because a triplet merge tree answers all proposed queries in constant time and can be constructed from a merge tree in linear time.

关键词： Human-centered computing-visualization-visualization application domains-Scientific visualization

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parallel coordinates visualization of large data investigation on HDDs

Parallel coordinates visualization of large data investigati...

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10th International Conference Computer graphics, Imaging, and visualization, CGIV 2013

作者： Wang, Wenbo Huang, Mao Lin School of Computer Science Tianjin University Tianjin 300072 China Faculty of Engineering and Information Technology University of Technology Sydney NSW 2007 Australia

ISBN: (纸本)9780769550510

data visualization and Visual Analytics (DVVA) techniques help human to extract essential information and knowledge from large and complex data sets, and then represent them clearly and comprehensively in the graphic format for better understanding. These techniques have been successfully applied in many areas, including the application in computer forensic science. This paper discusses the background, approaches to the visual analysis of typical computer forensic data. Primarily we will look at how visualization techniques can enhance the computer forensics task, and proposes a new model with a set of data attributes for visual analytics of computer forensics. © 2013 ieee.

关键词： Computer forensics

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Case study: Mantle convection visualization on the cray T3D

Case study: Mantle convection visualization on the cray T3D

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Proceedings of the 1996 ieee visualization Conference

作者： Painter, James S. Bunge, Hans-Peter Livnat, Yarden Los Alamos Natl Lab Los Alamos United States

The recent years have seen rapid advancement towards viewing the Earth as an integrated system. This means that we have come to understand the interdependence of the major planetary subsystems - atmosphere, biosphere, oceans and the deep earth interior - on a large range of time and length scales. One of the longest time scales of the planet is imposed by solid state convection within the silicate Earth mantle. Mantle convection modeling, and other earth science modeling efforts, now are producing simulation data on grids that are large enough to strain the memory and processing power of even the largest high-end graphics workstations. Another alternative is to use parallel visualization tools running on the massively parallel computers that generated the data. This is the approach that we have taken for the visualization of mantle convection simulation data.

关键词： Computer simulation

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Concurrent visualization in a production supercomputing environment

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ieee TRANSACTIONS ON visualization AND COMPUTER graphics 2006年第5期12卷 997-1004页

作者： Ellsworth, David Green, Bryan Henze, Chris Moran, Patrick Sandstrom, Timothy NASA Ames Res Ctr AMTI Washington DC 20546 USA

We describe a concurrent visualization pipeline designed for operation in a production supercomputing environment. supercomputer for a massively parallel forecast model (GEOS4). During the 2005 Atlantic hurricane season, GEOS4 was run 4 times a day under tight time constraints so that its output could be included in an ensemble prediction that was made available to forecasters at the National Hurricane Center. Given this time-critical context, we designed a configurable concurrent pipeline to visualize multiple global fields without significantly affecting the runtime model performance or reliability. We use MPEG compression of the accruing images to facilitate live low-bandwidth distribution of multiple visualization streams to remote sites. We also describe the use of our concurrent visualization framework with a global ocean circulation model, which provides a 864-fold increase in the temporal resolution of practically achievable animations. In both the atmospheric and oceanic circulation models, the application scientists gained new insights into their model dynamics, due to the high temporal resolution animations attainable.

关键词： supercomputing concurrent visualization interactive visual computing time-varying data high temporal resolution visualization GEOS4 global climate model hurricane visualization ECCO ocean modeling

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