By Colin J. Theaker
Rev. and multiplied ed. of: a realistic direction on working structures. 1983.
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Although, in practice, these systems may have Bask Concepts 29 additional constraints over their more simple wii-processor counterparts, particularly in terms of their expected resilience and performance, conceptually the operating system processes are very similar and may differ only slightly in their implementation. Other aspects of mUltiprocessor systems, specifically in a networked context, are examined in chapter 13. H. Enslow (1977). 'Multiprocessor Organisation - A Survey', Computing Surveys, Vol.
2 II ) Simple buffering to allow overlapped transfers It can be seen that the utilisation of resources is very much better in this system, although the input, process and output times are rarely so well matched that all resources can be active all of the time. In a steady state, the average time for processing a transaction is Max (input time, process time, output time) and the system is quickly reduced to processing transactions at the rate determined by the slowest activity. 3, which shows the behaviour of the system when running (a) input-limited and (b) CPUlimited processes.
5 Scheduling algorithms The approach to be adopted in scheduling depends on the workload of the system and, in particular, on whether the system is (a) deterministic or (b) nondeterministic. The first might include real-time control systems where the frequency at which interactions are required and the processor time required for each is known in advance. The second is the more common and includes general-purpose, time-sharing systems where the user behaviour is more varied. In this case it is necessary to resort to optimising the expected performance using suitable probability distributions for arrival and execution times.
Concepts of Operating Systems by Colin J. Theaker