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Hybrid Scheduling for parallel Rendering using Coherent Ray Tasks

Hybrid Scheduling for Parallel Rendering using Coherent Ray ...

引用

1999 ieee symposium on parallel visualization and graphics, PVGS 1999

作者： Reinhard, Erik Chalmers, Alan Jansen, Frederik W. University of Bristol Dept. of Computer Science Merchant Venturers Building Woodland Road BristolBS8 1UB United Kingdom Delft University of Technology Fac. of Information Technology and Systems Zuidplantsoen 4 Delft2628 BZ Netherlands

ISBN: (纸本)1581132379

parallelising ray tracing with a data parallel approach allows rendering of arbitrarily large models, but the inherent load imbalances may lead to severe inefficiencies. To compensate for the uneven load distribution, demand-driven tasks may be split off and scheduled to processors that are less busy. We propose a hybrid scheduling algorithm which brings tasks and data together according to coherence between rays. The amount of demand-driven versus dataparallel tasks is a function of the coherence between rays and the amount of imbalance in the basic data-parallel load. Processing power, communication and memory are three resources which should be evenly used. Our current implementation is assessed against these requirements, showing good scalability and very little communication at the cost of a slightly larger memory overhead.

关键词： Ray tracing

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parallel rendering of 3D AMR data on the SGI/Cray T3E 7

Parallel rendering of 3D AMR data on the SGI/Cray T3E

引用

7th symposium on the Frontiers of Massively parallel Computation (Frontiers 99)

作者： Ma, KL NASA Langley Res Ctr Inst Comp Applicat Sci & Engn Hampton VA 23681 USA

ISBN: (纸本)0769500870

This paper describes work-in-progress on developing parallel visualization strategies for 3D Adaptive Mesh Refinement (AMR) data. AMR is a simple and powerful tool for modeling many important scientific and engineering problems. However visualization tools for 3D AMR data are not generally available. Converting AMR data onto a uniform mesh would result in high storage requirements, and rendering the uniform-mesh data on an average graphics workstation can be painfully slow if not impossible. The adaptive nature of the embedded mesh demands sophisticated visualization calculations. In this work, we compare the performance and storage requirements of a parallel volume renderer for regular-mesh data with a new parallel renderer based on adaptive sampling. While both renderers can achieve interactive visualization, the new approach offers significant performance gains, as indicated by our experiments on the SGI/Cray T3E.

关键词： visualization

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parallel visualization of large-scale aerodynamics calculations: A case study on the cray T3E

Parallel visualization of large-scale aerodynamics calculati...

引用

1999 ieee symposium on parallel visualization and graphics, PVGS 1999

作者： Ma, Kwan-Liu Crockett, Thomas W. University of California Department of Computer Science UC Davis One Shields Avenue DavisCA95616-8562 United States NASA Langley Research Center MS 132C HamptonVA23681-2199 United States

ISBN: (纸本)1581132379

This paper reports the performance of a parallel volume rendering algorithm for visualizing a large-scale unstructured-grid dataset produced by a three-dimensional aerodynamics simulation. This dataset, containing over 18 million tetrahedra, allows us to extend our performance results to a problem which is more than 30 times larger than the one we examined previously. This high resolution dataset also allows us to see fine, three-dimensional features in the flow field. All our tests were performed on the SGI/Cray T3E operated by NASA's Goddard Space Flight Center. Using 511 processors, a rendering rate of almost 9 million tetrahedra/second was achieved with a parallel overhead of 26%.

关键词： Volume rendering

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parallel multipipe rendering for very large isosurface visualization

Parallel multipipe rendering for very large isosurface visua...

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1st Joint Eurographics - ieee TCVG symposium on visualization, VisSym 1999

作者： Udcshi, Tushar Hansen, Charles D. Department of Computer Science University of Utah 50 S. Campus Center Drive Em. 3190 Salt Lake CityUT84112-9205 United States

ISBN: (纸本)9783709168035

In exploratory scientific visualization, isosurfaces are typically created with an explicit polygonal representation for the surface using a technique such as Marching Cubes. For even moderate data sets, Marching Cubes can generate an extraordinary number of polygons, which take time to construct and to render. To address the rendering bottleneck, we have developed a multipipe strategy for parallel rendering using a combination of CPUs and parallel graphics adaptors. The multipipe system uses multiple graphics adapters in parallel, the so called SGI Onyx2 Reality Monster. In this paper, we discuss the issues of using the multiple pipes in a Sort-Last fashion which out performs a single graphics adaptor for a surprisingly low number of polygons. © 1999 Eurographics Association. All rights reserved.

关键词： Program processors

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Fast digital perspective shell rendering 12

Fast digital perspective shell rendering

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12th Brazilian symposium on Computer graphics and lmage Processing, SIBGRAPI 1999

作者： Carnielli, G.P. Falcao, A.X. Udupa, J. Universidade Estadual de Campinas Instituto de Computação Campinas SPC.P. 6176 13083-970 Brazil University of Pennsylvania Dept. of Radiology 423 Guardian Drive PhiladelphiaPA19104-6021 United States

ISBN: (纸本)0769504817

Volume visualization methods usually require extensive storage and time-intensive computations. To make them viable in many applications, researchers have proposed various types of hardware-based and software-based solutions. In most of these solutions, the rendering is based on orthographic parallel projection. However, in applications such as virtual endoscopy, perspective projection is necessary to allow the observer to travel inside the structures. In this paper, we extend one of these software-based solutions, called shell rendering, to provide fast digital perspective projection. The main idea in digital perspective is that each voxel should be rendered using an integer number of pixels which is inversely proportional to the distance between the voxel and the observer and that that distance can be discretized. We show that the new method, called digital perspective shell rendering, provides the same image quality as orthographic parallel projection. © 1999 ieee.

关键词： Rendering (computer graphics)

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parallel accelerated isocontouring for out-of-core visualization

Parallel accelerated isocontouring for out-of-core visualiza...

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ieee parallel visualization and graphics symposium

作者： C.L. Bajaj V. Pascucci D. Thompson X.Y. Zhang Department of Computer Sciences and TICAM University of Technology Austin TX USA

We introduce a scheme for static analysis that allows us to partition large geometric datasets at multiple levels of granularity to achieve both load balancing in parallel computations and minimal access to secondary memory in out-of-core computations. The idea is illustrated and fully exploited for the case of isosurface extraction, but extendible to a class of algorithms based on a small set of parameters and for which an appropriate static analysis can be performed.

关键词： Acceleration Isosurfaces Load management Data visualization Data mining Partitioning algorithms Performance analysis Algorithm design and analysis Data preprocessing Tree data structures

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Overlapping multi-processing and graphics hardware acceleration: performance evaluation

Overlapping multi-processing and graphics hardware accelerat...

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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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Web based collaborative visualization of distributed and parallel simulation

Web based collaborative visualization of distributed and par...

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ieee parallel visualization and graphics symposium

作者： C. Bajaj S. Cutchin Department of Computer Sciences and TICAM University of Technology Austin TX USA

This paper presents an interaction model to support collaborative scientific visualization. Relevant prior work is presented to contextualize the model and its import. An implementation of the model is presented within a collaborative system that supports flexible collaborative coupling of multi-user applications. An example application is presented to demonstrate the capabilities of the model. The implementation is Web based, fully supports multi-user interfaces, uses VRML and compressed VRML for three dimensional graphic display, and is implemented in Java with CORBA support for external server access. An example experiment involving multiple users is described.

关键词： Collaboration visualization Computational modeling Wide area networks Collaborative work Computer graphics Search engines Internet Scheduling Displays

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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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Hybrid scheduling for parallel rendering using coherent ray tasks

Hybrid scheduling for parallel rendering using coherent ray ...

引用

ieee parallel visualization and graphics symposium

作者： E. Reinhard A. Chalmers F.W. Jansen University of Bristol Bristol Bristol GB

parallelising ray tracing with a data parallel approach allows rendering of arbitrarily large models, but the inherent load imbalances may lead to severe inefficiencies. To compensate for the uneven load distribution, demand-driven tasks may be split off and scheduled to processors that are less busy. We propose a hybrid scheduling algorithm which brings tasks and data together according to coherence between rays. The amount of demand-driven versus data parallel tasks is a function of the coherence between rays and the amount of imbalance in the basic data-parallel load. Processing power, communication and memory are three resources which should be evenly used. Our current implementation is assessed against these requirements, showing good scalability and very little communication at the cost of a slightly larger memory overhead.

关键词： Layout Processor scheduling Ray tracing Computer graphics Computational modeling Electrical capacitance tomography parallel processing Rendering (computer graphics) Data communication Scheduling algorithm

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