scholarly journals Roofline: An Insightful Visual Performance Model for Floating-Point Programs and Multicore Architectures

2009 ◽  
Author(s):  
Samuel Williams ◽  
Andrew Waterman ◽  
David Patterson
Keyword(s):  
Performance Model ◽  
Visual Performance ◽  
Floating Point ◽  
Multicore Architectures

scholarly journals LEGIBILITY OF URBAN HIGHWAY TRAFFIC SIGNS USING NEW RETROREFLECTIVE MATERIALS

Transport ◽  
2010 ◽  
Vol 25 (3) ◽  
pp. 229-236 ◽  
Author(s):  
John D. Bullough ◽  
Nicholas P. Skinner ◽  
Conan P. O’Rourke
Keyword(s):  
Urban Area ◽  
Performance Model ◽  
Visual Performance ◽  
Practical Significance ◽  
Department Of Transportation ◽  
Highway Traffic ◽  
Traffic Signs ◽  
Photometric Measurements ◽  
Highway Signs

Unlighted highway signs, which use newly developed retroreflective materials, were installed along the major expressway in an urban area by the local department of transportation. Photometric measurements of the signs were used to assess their legibility applying the relative visual performance model, in comparison to lighted signs, con‐ forming to recommended illumination practices. The calculated visibility of the measured unlighted signs was similar to that of the signs equipped with exterior sign illumination. The practical significance and limitations of the relative visual performance approach are discussed.

Human visual performance model for crewstation design

1991 ◽  
Author(s):  
James O. Larimer ◽  
Michael P. Prevost ◽  
Aries R. Arditi ◽  
Steven Azueta ◽  
James R. Bergen ◽  
...  
Keyword(s):  
Performance Model ◽  
Visual Performance

Work Zone Lighting and Visual Performance

2013 ◽  
Vol 2337 (1) ◽  
pp. 25-34 ◽  
Author(s):  
John D. Bullough ◽  
Ute C. Besenecker ◽  
Jeremy D. Snyder ◽  
Nicholas P. Skinner
Keyword(s):  
Older Workers ◽  
Full Scale ◽  
Performance Model ◽  
Work Zone ◽  
Visual Performance ◽  
Light Levels ◽  
Lighting Systems ◽  
Control Light ◽  
Computational Analyses

In part because of the potential for high levels of glare from work zone illumination, recommendations for light levels from work zone illumination systems are substantially higher than for levels used along roadways in non–work zone locations. In a two-part study, requirements for work zone illumination light levels were assessed. First, levels for workers varying in age from 20 to 60 years were evaluated with the relative visual performance model, with and without the presence of visibility-reducing glare. Except for the smallest, lowest-contrast tasks performed by the older workers, an illuminance of 10 lx resulted in visibility well above the threshold even in the presence of glare, and an illuminance of 30 lx resulted in suprathreshold visibility for these conditions as well. The results of these computational analyses were largely confirmed in a full-scale, outdoor field demonstration attended by transportation agency engineers and highway contractors. Together, the findings suggest that when lighting systems provide sufficient glare control, light levels do not always need to be especially high to ensure adequate visibility for workers.

scholarly journals Implementation and Performance Modeling of Deterministic Particle Transport (Sweep3D) on the IBM Cell/B.E.

2009 ◽  
Vol 17 (1-2) ◽  
pp. 199-208 ◽  
Author(s):  
Olaf Lubeck ◽  
Michael Lang ◽  
Ram Srinivasan ◽  
Greg Johnson
Keyword(s):  
Message Passing ◽  
Programming Model ◽  
Performance Model ◽  
Floating Point ◽  
Design Parameters ◽  
Data Movement ◽  
Architecture Model ◽  
Future Design ◽  
Scientific Simulations ◽  
And Performance

The IBM Cell Broadband Engine (BE) is a novel multi-core chip with the potential for the demanding floating point performance that is required for high-fidelity scientific simulations. However, data movement within the chip can be a major challenge to realizing the benefits of the peak floating point rates. In this paper, we present the results of implementing Sweep3D on the Cell/B.E. using an intra-chip message passing model that minimizes data movement. We compare the advantages/disadvantages of this programming model with a previous implementation using a master–worker threading strategy. We apply a previously validated micro-architecture performance model for the application executing on the Cell/B.E. (based on our previous work in Monte Carlo performance models), that predicts overall CPI (cycles per instruction), and gives a detailed breakdown of processor stalls. Finally, we use the micro-architecture model to assess the performance of future design parameters for the Cell/B.E. micro-architecture. The methodologies and results have broader implications that extend to multi-core architectures.

The Sky Is Not the Limit: A Visual Performance Model for Cyber-Physical Co-Design in Autonomous Machines

2020 ◽  
Vol 19 (1) ◽  
pp. 38-42 ◽  
Author(s):  
Srivatsan Krishnan ◽  
Zishen Wan ◽  
Kshitij Bhardwaj ◽  
Paul Whatmough ◽  
Aleksandra Faust ◽  
...  
Keyword(s):  
Performance Model ◽  
Visual Performance ◽  
Autonomous Machines
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