Feng's Computer Architectures: Parallelism & Utilization Rate, Exams of Advanced Computer Architecture

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Feng’s Classification

Narayan Kandel

071/MSCSKE/

Classification of computer Architectures

Flynn’s Classification (1966): is based on the multiplicity of instruction stream and data stream in a computer system.

Feng’s Classification (1972): is based on serial versus parallel processing.

Handler’s Classification (1977): is determined by the degree of parallelism and pipelining in various subsystem levels.

Classification based on Word/Bit Count

Classification based on sequential and parallel operation at bit and word levels :

1. Word Serial and Bit Serial (WSBS): also called as Bit Serial Processing (1 bit is processed at time); slow

2. Word Parallel and Bit Serial (WPBS): also called as Slice processing (m bit slice at a time)

3. Word Serial and Bit Parallel (WSBP): also called as word slice processing (1 word of n bit at time)

4. Word Parallel and Bit Parallel (WPBP): also known as fully parallel processing; fastest

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 (^4)

Example

word length (n) 5

1. Word Serial and Bit Serial (WSBS)

(1, 1)

2. Word Parallel and Bit Serial (WPBS)

(*, 1)

3. Word Serial and Bit Parallel (WSBP)

(1, *)

4. Word Parallel and Bit Parallel (WPBP)

(*, *)

• ---> greater than 1

Limitation

1. Fails to project the concurrency in pipeline processors as degree of parallelism doesn’t account for concurrency handle by pipelined design

Handler’s schema allow pipeline to be specific...

References...

1. Advanced Computer Architecture & Computing By S.S.Jadhav, Revised Edition 2009, Technical Publication Pune.
2. Parallel Computing By Moreshwar R. Bhujade , New AGE international Publishers.