By Edward D. Lazowska
A entire insurance of the pc procedure functionality review technology--queueing community types.
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Extra info for Quantitative System Performance, Computer System Analysis Using Queuing Network Models
The transition systems differed in their CPUs: the 8130 CPU was, in fact, slightly slower than that of the existing 3790, while the 8140 CPU was roughly 50% faster. Now we make a key observation. On the existing system, the workload is CPU-bound. Furthermore, since response times are unacceptable, we can assume that the workload intensity is sufficiently high that the CPU is approaching saturation. The faster disks of the 8130 are of little value under these circumstances, while its slower CPU is a significant liability.
As an example, for one of the benchmarks the measured response time for file modification transactions was 10 seconds, while for three different but equally reasonable methods of allocating measured I/O activity among the four workload components, the model projected response times of 6, 7, and 11 seconds. ) Consider the set of inputs for which the model projected a response time of 6 seconds. 2 seconds. 2 seconds, because the measured response time on the existing, faster system was 10 seconds.
Sources of Insight 35 four workload components individually, so a multiple class model was required. Various methods of allocating this measured I/O activity among the four workload components yielded different values for some of the input parameters of the model. Not surprisingly, different response time projections from the model resulted. As an example, for one of the benchmarks the measured response time for file modification transactions was 10 seconds, while for three different but equally reasonable methods of allocating measured I/O activity among the four workload components, the model projected response times of 6, 7, and 11 seconds.