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- W2983775866 abstract "Clark advocated quasi-general-purpose arrays of computers as the most cost-effective means to high-performance graphics and other applications as well. Such arrays can be quite inexpensive, offering orders of magnitude improvement over the cost of supercomputers and the performance of microcomputers. As an example, Clark used the Geometry Engine pipeline in the Iris workstation.A typical computer spends about 10% of its cycles (or less) doing arithmetic, as opposed to moving data, etc. Thus it can be characterized as 10% efficient at doing arithmetic. A typical special-purpose architecture is about 30% efficient, still having to fetch arguments and feed them to an arithmetic unit. The path to higher efficiencies (in the realm of 85-90%) lies in a two-pronged method. (1) Increase the percentage of states spent in arithmetic by heavily pipelining the arithmetic (thus slowing things). Then (2) use many arithmetic units in parallel to get the speed back. This is the philosophy inherent in the geometry engine.There has been much discussion of n-cube architectures (Hypercube, etc.) recently. However, much can be done with 1-cube (pipeline) and 2-cube (planar array) architectures. Clark described 2-cube architectures for ray-tracing, differential equation solving, high-speed scan conversion, z-buffer and pixel-by-pixel CSG operations. For example the ray-tracing architecture uses an array of processors wherein each processor represented some set of pixels. The environment of objects flows through the array effecting those pixels whose rays intersect an object. Secondary rays are stored and the environment recirculates until all rays are satisfied.The major point was that such arrays, using programmable elements can handle large generic classes of algorithms, making them quasi-general-purpose, more useful than special-purpose architectures and much more efficient than truly general-purpose architectures." @default.
- W2983775866 created "2019-11-22" @default.
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- W2983775866 date "1986-01-01" @default.
- W2983775866 modified "2023-09-23" @default.
- W2983775866 title "Special purpose computer arrays for graphics and other applications (invited talk) (summary only)." @default.
- W2983775866 hasPublicationYear "1986" @default.
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