SSC IMD SA 2017 – Question 104

Which of the following architecture(s) is/are not suitable for realizing SIMD?

• Vector processor and Array processor
• Von Neumann
• Array processor
• Von Neumann and Array processor

Detailed Explanation:

The correct answer is b) Von Neumann (वॉन न्यूमैन).

Flynn’s Taxonomy: Computer architectures are classified into four categories based on the multiplicity of hardware instruction and data streams:

• SISD (Single Instruction, Single Data): A single processor executes a single instruction stream to manipulate data stored in a single memory. The classic Von Neumann architecture is an SISD architecture.
• SIMD (Single Instruction, Multiple Data): A single control unit issues one instruction, and multiple processing elements (PEs) execute that identical instruction simultaneously across multiple data streams. Examples include Array Processors and Vector Processors.
• MISD (Multiple Instruction, Single Data): Multiple instructions operate on a single data stream (rarely used).
• MIMD (Multiple Instruction, Multiple Data): Multiple autonomous processors concurrently execute different instructions on different data (e.g., multicore systems, distributed clusters).

Since the Von Neumann architecture is fundamentally a sequential, single-instruction single-data (SISD) model, it is not suitable for realizing SIMD parallel processing.