A workload model and measures for computer performance evaluation
National Aeronautics and Space Administration, 1972 - Reference - 26 pages
A generalized workload definition is presented which constructs measurable workloads of unit size from workload elements, called elementary processes. An elementary process makes almost exclusive use of one of the processors, CPU, I/O processor, etc., and is measured by the cost of its execution. Various kinds of user programs can be simulated by quantitative composition of elementary processes into a type. The character of the type is defined by the weights of its elementary processes and its structure by the amount and sequence of transitions between its elementary processes. A set of types is batched to a mix. Mixes of identical cost are considered as equivalent amounts of workload. These formalized descriptions of workloads allow investigators to compare the results of different studies quantitatively. Since workloads of different composition are assigned a unit of cost, these descriptions enable determination of cost effectiveness of different workloads on a machine. Subsequently performance parameters such as throughput rate, gain factor, internal and external delay factors are defined and used to demonstrate the effects of various workload attributes on the performance of a selected large scale computer system.
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50 percent I/O batch of programs Central Process Central Processing Unit compute bound jobs core memory cost structure degree of hashing different workloads disc Drum Process relative Elemen Elementary Process durations Elementary Process space Elementary Storage Requirements executive system expectation E AST External Delay External Delay Factor fast drum channels Fast Drum Process Figure I/O bound Mix I/O channels I/O Elementary Processes Internal Delay Factor kilobits large number Marshall Space Flight max(tt measured mentary Processes Mix Average Type number of jobs number of Types percentage of I/O PH Process physical processors Process Random Access Process space reduced Random Access Process random variable Rates and Gain relative to weight scale computer sequence Sequential Access Process serial processing sext Storage Cost Factor storage vector subsystems tape drives Throughput Rate total I/O Transition Table UNIVAC utilization factors Virtual Elementary Processors Weight of Fast weight of total Weight Vector workload representation