Electronics and Communication Engineering (ECE) : Array Processing Computer Science Engineering (CSE) Notes | EduRev
- An array processor is a processor that performs computations on large arrays of data.
- The term is used to refer to two different types of processors.
- Attached array processor:
- Is an auxiliary processor.
- It is intended to improve the performance of the host computer in specific numerical computation tasks.
- SIMD array processor:
- Has a single-instruction multiple-data organization.
- It manipulates vector instructions by means of multiple functional units responding to a common instruction.
Attached Array Processor
- Its purpose is to enhance the performance of the computer by providing vector processing for complex scientific applications.
- Parallel processing with multiple functional units
- Fig. 4-14 shows the interconnection of an attached array processor to a host computer.
- For example, when attached to a VAX 11 computer, the FSP-164/MAX from Floating-Point Systems increases the computing power of the VAX to 100megaflops.
- The objective of the attached array processor is to provide vector manipulation capabilities to a conventional computer at a fraction of the cost of supercomputer.
SIMD Array Processor
- An SIMD array processor is a computer with multiple processing units operating in parallel.
- A general block diagram of an array processor is shown in Fig. 9-15.
- It contains a set of identical processing elements (PEs), each having a local memory M.
- Each PE includes an ALU, a floating-point arithmetic unit, and working registers.
- Vector instructions are broadcast to all PEs simultaneously.
- Masking schemes are used to control the status of each PE during the execution of vector instructions.
- Each PE has a flag that is set when the PE is active and reset when the PE is inactive.
- For example, the ILLIAC IV computer developed at the University of Illinois and manufactured by the Burroughs Corp.
- Are highly specialized computers.
- They are suited primarily for numerical problems that can be expressed in vector or matrix form.