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Feng’s Classification of Computer Architectures Architectures Presented By : OM PRAKASH MAHATO Roll no:- 069/MSCSKE/659
Introduction As We know, there are three classification of computer architectures which are: 1) Flynn’s Classification (1966): is based on the multiplicity of instruction stream and data stream in a computer system. 2) Feng’s Classification (1972): is based on serial versus parallel processing. 3) Handler’s Classification (1977): is determined by the degree of parallelism and pipelining in various subsystem levels.
Feng’s Classification •
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Feng (1972) has proposed the use of degree of parallelism to classify various computer architectures. The maximum number of binary digits(bits) that can be processed within a unit time by a computer system is called maximum degree of parallelism P. Let us Pi be the number of bits that can be processed within the ith processor cycle. Consider processor cycles indexed by i=1,2,3…,T. The average degree of parallelism , Pa is given by
In general, Pi≤P. We define the utilization rate µ of a computer system within T cycles is
If the computing power is fully utilized (or the parallelism is fully exploited), we have Pi=P for all I and µ=1 for 100 percent utilization. The utilization rate depends on the application program being executed.
Based on the Feng’s scheme, we sequential and parallel operations at bit and word levels to produce the following classification: 1)Word Serial and Bit Serial (WSBS) : Called Bit Serial Processing because one bit is processed at a time. Slow Was done first generation Computers 2) Word Parallel and Bit Serial (WPBS): Called bit Slice processing because number of bit-slices (words having 1 bit) is processing at time. 3)Word Serial and Bit Parallel (WSBP): Called word-Slice processing because one word of number of bits is processed at a time. 4) Word Parallel and Bit Parallel (WPBP): Is known as Fully Parallel Processing (or Simply parallel processing) in which an array of bits is processed at a time. The fastest processing mode among four.
The maximum degree of parallelism P is given by the product of the number of bits in a word(n) and number of words in parallel(m). P= m.n Some of the commercial machines are classified as in following figure 1.7 .
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In above diagram, x axis represents the word length and y axis represents the number of words processed in parallel. A machine is placed at a point in the space defined by these (x,y) coordinates. The maximum degree of parallelism is given by the area of the rectangle formed by the origin and the point representing the machine.
For example: Cray I has of area 64
where as IBM
370/168 has an area of 32.
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A more Examples are tabulated in following slide.
Limitation of Feng’s Classification •
Feng’s Scheme Fails to project the concurrency in pipeline processors.
References •
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Advanced Computer Architecture & Computing By S.S.Jadhav, Revised Edition 2009, Technical Publication Pune. Parallel Computing By Moreshwar R. Bhujade , New AGE international Publishers.