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Overlapping multi-processing and graphics hardware acceleration: performance evaluation

Overlapping multi-processing and graphics hardware accelerat...

引用

ieee parallel visualization and graphics symposium

作者： X. Cavin L. Alonso J.-C. Paul LORIA INRIA Lorraine France

Recently, multi-processing has been shown to deliver good performance in rendering. However, in some applications, processors spend too much time executing tasks that could be more efficiently done through intensive use of new graphics hardware. We present a novel solution combining multi-processing and advanced graphics hardware, where graphics pipelines are used both for classical visualization tasks and to advantageously perform geometric calculations while remaining computations are handled by multi-processors. The experiment is based on an implementation of a new parallel wavelet radiosity algorithm. The application is executed on the SGI Origin2000 connected to the SGI InfiniteReality2 rendering pipeline. A performance evaluation is presented. Keeping in mind that the approach can benefit all available workstations and super-computers, from small scale (2 processors and 1 graphics pipeline) to large scale (p processors and n graphics pipelines), we highlight some important bottlenecks that impede performance. However, our results show that this approach could be a promising avenue for scientific and engineering simulation and visualization applications that need intensive geometric calculations.

关键词： Hardware Acceleration Rendering (computer graphics) Computer graphics Application software Pipelines visualization parallel processing Solid modeling Workstations

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Scalable distributed visualization using off-the-shelf components

Scalable distributed visualization using off-the-shelf compo...

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ieee parallel visualization and graphics symposium

作者： A. Heirich L. Moll Tandem Labs. Compaq Comput. Corp. Houston TX USA

This paper describes a visualization architecture for scalable computer systems. The architecture is currently being prototyped for use in Beowulf-class clustered systems. A set of OpenGL frame buffers are driven in parallel by a set of CPUs. The visualization architecture merges the contents of these frame buffers by user programmable associative and commutative combining operations. The system hardware is built from off-the-shelf components including OpenGL accelerators, field programmable gate arrays (FPGAs), and gigabit network interfaces and switches. A second generation prototype supports 60 Hz operation at 1024/spl times/1024 pixel resolution with interactive latency up to 1000 nodes.

关键词： Computer architecture Computer graphics data visualization Prototypes Hardware Field programmable gate arrays Computer networks Laboratories Network interfaces Switches

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Dynamic view-dependent partitioning of structured grids with complex boundaries for object-order rendering techniques

Dynamic view-dependent partitioning of structured grids with...

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ieee parallel visualization and graphics symposium

作者： L.C. Burton R. Machiraju D.S. Reese NSF Engineering Research Center Department of Computer Science Mississippi State University USA

Object-order rendering techniques present an attractive approach to run-time visualization of structured grid data, particularly when combined with a parallel rendering paradigm such as image composition. The ability of this combination to exploit hardware exceeds that of parallel image order methods. However, certain configurations of grid boundaries prevent composition from being performed correctly. In particular when the boundary between two partitions contains concave sections, the partitions may no longer be depth sorted correctly, a requirement for some visualization techniques such as direct volume rendering. This occurs because the concave boundary prevents even the simple ordering of two adjacent partitions. If the data may be repartitioned such that it can be depth sorted correctly then an image composition approach is a viable option. To facilitate such an operation, we present an algorithm to analyze the geometric structure of a grid boundary and extract knowledge about how the boundary impacts depth sorting and therefore image composition. We then show through examples how this knowledge may be applied to create a set of partitions that may be properly depth sorted.

关键词： data visualization Partitioning algorithms Physics computing data engineering Geometry Computer science Runtime Image analysis Algorithm design and analysis data mining

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Exploiting frame coherence with the temporal depth buffer in a distributed computing environment

Exploiting frame coherence with the temporal depth buffer in...

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ieee parallel visualization and graphics symposium

作者： T.A. Davis E.W. Davis Clemson University USA North Carolina State University USA

We introduce the notion of a parallel temporal depth buffer (or t-buffer) to speed up the rendering process for ray traced animations. The t-buffer is a conceptually simple data structure which stores knowledge about coherent pixel values across the duration of an animation. Through the use of this information, we can potentially avoid recomputing a significant number of redundant pixel values and thus substantially reduce overall computing time. Although the t-buffer is general enough to be used with a variety of rendering methods, the algorithm employed in this work targets ray-traced animations and therefore readily lends itself to parallelization. A clustered (or distributed) computing environment is an efficient and effective candidate to handle the parallel computation due to its relatively low cost and the high computation to communication ratio inherent in the processing. The results from this method show substantial reductions in computation and overall rendering time with relatively low overhead.

关键词： Distributed computing Animation Rendering (computer graphics) parallel processing Ray tracing Pixel Computational efficiency Cameras data structures parallel algorithms

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Interactive volume segmentation with the PAVLOV architecture

Interactive volume segmentation with the PAVLOV architecture

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ieee parallel visualization and graphics symposium

作者： K. Kreeger A. Kaufman Center for Visual Computing (CVC) and Department of Computer Science State University of New York Stony Brook NY USA

We propose a new paradigm for interactive volume visualization which allows enhanced exploration of datasets through the use of real-time volume processing (e.g., segmentation) tightly coupled with rendering. We show examples of how this paradigm supports a new way of examining a dataset by providing interactive visual feedback to segmentation parameter adjustment. We have developed a hardware co-processor, called PAVLOV, based on a SIMD mesh architecture. It supports our paradigm by providing volume processing at over 15 Hz while also rendering of the results at 30 Hz. We show how PAVLOV's programmability is used for volume processing applications, such as interactive segmentation and feature extraction. We further compare 3D segmentation on mesh architectures to known efficient methods for 2D segmentation.

关键词： visualization Feature extraction Frequency Computer architecture Computer science Feedback Coprocessors Personal communication networks data engineering Volume measurement

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A superscalar 3D graphics engine

A superscalar 3D graphics engine

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ieee/ACM International symposium on Microarchitecture (MICRO)

作者： A. Wolfe D.B. Noonburg S3 Incorporated Santa Clara CA USA

3D graphics performance is increasing faster than any other computing application. Almost all PC systems now include 3D graphics accelerators for games, CAD, or visualization applications. Many of the microarchitectural techniques that have been used to enhance the performance of microprocessors can be applied to graphics systems as well. We present an architecture for an out-of-order, superscalar rasterizer for 3D graphics. This allows the concurrent execution of multiple graphics primitives while maintaining exact sequential semantics. Experimental results show 1.5-3.6X speedups on real applications using a simple model, similar to the results from many integer benchmarks on superscalar processors. Enhanced techniques specific to 3D graphics for decomposing large triangles and breaking false dependence chains increase performance to more than 10x a sequential system.

关键词： Engines Microprocessors Application software Microarchitecture parallel processing Rendering (computer graphics) Computer applications visualization Computer graphics Computer interfaces

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Adaptive, Multiresolution visualization of large data Sets using a Distributed Memory Octree

Adaptive, Multiresolution Visualization of Large Data Sets u...

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Supercomputing Conference

作者： L.A. Freitag R.M. Loy Mathematics and Computer Science Division Argonne National Laboratory Argonne IL USA

The interactive visualization and exploration of large scientific data sets is a challenging and difficult task; their size often far exceeds the performance and memory capacity of even the most powerful graphics workstations. To address this problem, we have created a technique that combines hierarchical data reduction methods with parallel computing to allow interactive exploration of large data sets while retaining full-resolution capability. The user may interactively change the resolution of the reduced data set either globally or by specifying a region of interest. In this way, high resolution can be obtained in local subregions without sacrificing graphics performance. We describe the software architecture of the system, give details pertaining to the use of a distributed memory octree used to create the reduced data set, and present performance results for the visualization of Rayleigh-Taylor instability and x-ray burst simulation data sets.

关键词： data visualization graphics Workstations Concurrent computing Computational modeling Multiresolution analysis Government Computer displays Mathematics Computer science

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Sensemaking of evolving Web sites using visualization spreadsheets

Sensemaking of evolving Web sites using visualization spread...

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ieee symposium on Information visualization (INFOVIS)

作者： E.H. Chi S.K. Card Xerox Palo Alto Research Center Palo Alto CA USA

In the process of knowledge discovery, workers examine available information in order to make sense of it. By sensemaking, we mean interacting with and operating on the information with a variety of information processing mechanisms. Previously, we introduced a concept that uses the spreadsheet metaphor with cells containing visualizations of complex data. We extend and apply a cognitive model called "visual sensemaking" to the visualization spreadsheet. We use the task of making sense of a large Web site as a concrete example throughout the paper for demonstration. Using a variety of visualization techniques, such as the Disk Tree and Cone Tree, we show that the interactions of the visualization spreadsheet help users draw conclusions from the overall relationships of the entire information set.

关键词： data visualization Information processing Tree graphs Information analysis Concrete Web sites Environmental factors Costs data mining graphics

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A Java-based visual mining infrastructure and applications

A Java-based visual mining infrastructure and applications

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ieee symposium on Information visualization (INFOVIS)

作者： M.C. Hao U. Dayal M. Hsu J. Baker R. D'Eletto Hewlett Packard Research Laboratories USA

Many real-world KDD (Knowledge Discovery & data Mining) applications involve the navigation of large volumes of information on the web, such as, Internet resources, hot topics, and telecom phone switches. Quite often users feel lost, confused and overwhelmed with displays that contain too much information. This paper discusses a new content-driven visual mining infrastructure called VisMine, that uses several innovative techniques: (1) hidden visual structure and relationships for uncluttering displays; (2) simultaneous visual presentations for high-dimensional knowledge discovery; and (3) a new visual interface to plug in existing graphic toolkits for expanding its use in a wide variety of visual applications. We have applied this infrastructure to three data mining visualization applications-topic hierarchy for document navigation, web-based trouble shooting, and telecom switch mining.

关键词： Java Switches data mining Navigation Telecommunication switching Displays Internet Plugs graphics data visualization

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A memory addressing and access design for real time volume rendering

A memory addressing and access design for real time volume r...

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ieee International symposium on Circuits and Systems (ISCAS)

作者： M. Doggett M. Meissner WSI/GRIS University of Tübingen Germany

This paper presents a memory addressing design that uses buffering to achieve a cache hit ratio of 95% for a PCI based Volume Rendering hardware accelerator. The target system for this memory interface is VIZARD II, a second generation PCI board using several XILINX chips. To improve the performance of this and possibly other hardware accelerators, a cubic addressing scheme is presented that improves the percentage of cache hits to misses. To further improve the performance the cubic addressing is coupled with several FIFO buffers to minimise the pipeline stalling effect of cache misses in the eight parallel memory modules. This combination of addressing scheme and memory access buffering raises the cache hit to miss ratio from 63% to 95%. Most Volume Rendering systems are fully pipelined and can utilise the design presented here to increase the number of frames per second and the quality of rendered images.

关键词： Rendering (computer graphics) Casting Hardware Random access memory Computer graphics Biomedical imaging Real time systems Image generation Pipelines data visualization

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