Flynn’s Taxonomy
Single Instruction stream, Single Data stream (SISD)
- uniprocessor
- looks like standard sequential computer, but internally can exploit Instruction-level parallelism (ILP)
Single Instruction stream, Multiple Data stream (SIMD)
- same instructions executed by multiple processors on different data streams
- here “processor” does not mean a different physical CPU or another thread, “processor” is a smallest unit which can process data.
- Each processor has its own data memory (hence the MD of SIMD), but there is a single instruction memory and control processor
Multiple Instruction streams, Single Data stream (MISD)
- No commercial multiprocessor of this type available
Multiple Instruction streams, Multiple Data stream (MIMD)
- Each process fetches its own instructions, and operates on its own data
- more expensive than SIMD
References
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