By Wolfgang W. Osterhage
Computing energy functionality was once vital every now and then whilst was once nonetheless pricey, simply because needed to be positioned to the simplest use. in a while this criterion was once now not serious, due to the fact had develop into low-cost. in the meantime, notwithstanding, humans have discovered that functionality back performs an important position, as a result of significant drain on method assets all for constructing complicated purposes. This ebook distinguishes among 3 degrees of functionality optimization: the procedure point, program point and company approaches point. On each one, optimizations could be accomplished and cost-cutting potentials could be pointed out. The publication offers the correct theoretical history and measuring equipment in addition to proposed recommendations. An review of community screens and checklists rounds out the work.
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Extra resources for Computer Performance Optimization: Systems - Applications - Processes
In certain cases, both options permit the continuing execution of programs without I/O processes having necessarily been completed. Besides these, table sizes as such and the overall blocking philosophy play important roles, of course. Locking should be implemented on the lowest possible level (item), if feasible, never on table level and—if possible—also not on record level. 3 Application Environment Application environment is more than just the GUI visible to the user and the corresponding software and data base, which supports his transactions—including batch.
Fig. 5 I/O As already mentioned, there is a danger that a significant portion of CPU resources is required for the management of I/O waits. This is especially the case, when they are caused by process interruptions. Besides disk access themselves, important roles are played by the number and speed of communication channels and their controllers. Those are also required for terminals, modems and other communication hardware. A too small number of I/O controllers leads to communication bottlenecks.
2 Accesses Independent from data management systems in operation, various operating systems offer data access modalities having impact on overall performance. 2 Application Performance 33 Fig. 17 Reference architecture • buffered or non-buffered access, • access with or without I/O wait. In certain cases, both options permit the continuing execution of programs without I/O processes having necessarily been completed. Besides these, table sizes as such and the overall blocking philosophy play important roles, of course.