What is recorded here?
Flynn developed a hierarchical request/service model and used explicit workload and resource assumptions to compare the effectiveness of single- and multiple-stream computer organizations. Two computers with many execution units can still finish the same program at very different speeds. Flynn described programs as requests for services and organized those services into a hierarchy down to physical operations and storage. He distinguished logical dependencies from physical resource access, then examined how branching, communication, vector size and shared resources affect different organizations. The paper reused the instruction/data-stream categories from earlier work. Its performance conclusions depend on the modeled programs: logarithmic SIMD scaling is a conditional explanation of an earlier conjecture, rather than a law for every parallel workload. Input/output bottlenecks and detailed instruction-set differences were set aside. This record credits the1972 organization and analysis, not the invention of every category, processor or later architecture.
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Scientific scope
This is a classification and analytical description of computer organization using instruction/data streams and service models. A category label is not an algorithmic complexity result, a universal efficiency ranking or proof that all hybrid architectures fit one rigid category. Historical examples and reported implementation observations are not new WRS measurements.
Read the original work
- Michael J. Flynn, Some Computer Organizations and Their Effectiveness, original IEEE paper, NTNU copy
- IEEE Crossref deposit for Flynn1972 organization paper
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People and systems
Michael J. Flynn
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English catalogue narrative
Flynn: computer organization as a hierarchy of requests and resources
Flynn developed a hierarchical request/service model and used explicit workload and resource assumptions to compare the effectiveness of single- and multiple-stream computer organizations.
Two computers with many execution units can still finish the same program at very different speeds. Flynn described programs as requests for services and organized those services into a hierarchy down to physical operations and storage. He distinguished logical dependencies from physical resource access, then examined how branching, communication, vector size and shared resources affect different organizations. The paper reused the instruction/data-stream categories from earlier work. Its performance conclusions depend on the modeled programs: logarithmic SIMD scaling is a conditional explanation of an earlier conjecture, rather than a law for every parallel workload. Input/output bottlenecks and detailed instruction-set differences were set aside. This record credits the1972 organization and analysis, not the invention of every category, processor or later architecture.
Scientific scope
This is a classification and analytical description of computer organization using instruction/data streams and service models. A category label is not an algorithmic complexity result, a universal efficiency ranking or proof that all hybrid architectures fit one rigid category. Historical examples and reported implementation observations are not new WRS measurements.
People and systems
Michael J. Flynn