By Jane Hillston
This can be the 1st ebook proposing a stochastic extension of method algebra, PEPA; this is often proven to be appropriate for specifying a Markov strategy, that can then be utilized to functionality modelling. the tactic, that's illustrated with case reviews taken from the world of communique platforms, can without difficulty be used to build numerous types that may be analysed utilizing regular numerical options. one of many significant merits of PEPA over the normal tools for specifying stochastic functionality types is the inherent gear for reasoning in regards to the constitution and behavior of versions. within the later chapters this equipment is exploited to outline 4 equivalence family members over PEPA parts. every one of those notions of equivalence has intrinsic curiosity from a procedure algebra standpoint. although, also they are verified to be worthwhile in a functionality modelling context. To finish the booklet, a bit has been further surveying contemporary ends up in the world and discussing open questions.
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Additional resources for A Compositional Approach to Performance Modelling (Distinguished Dissertations in Computer Science)
In particular, we are less concerned with average response time than we are with worst-case response time. com 26 Chapter 3 response time for each system call in order for a real-time embedded system to be deterministic. In other words, simply obtaining the correct answer is not adequate. We must get the right answer within a speciﬁed time frame. Many RTOS vendors claim their systems are deterministic and justify that assertion by publishing tables of minimum, average, and maximum number of clock cycles required for each system call.
8 Counting Semaphore A counting semaphore is a public resource. There is no concept of ownership of semaphores, as is the case with mutexes. 3 ThreadX provides 32-bit counting semaphores where the count must be in the range from 0 to 4,294,967,295 or 232–1 (inclusive). When a counting semaphore is created, the count must be initialized to a value in that range. Each value in the semaphore is an instance of that semaphore. Thus, if the semaphore count is ﬁve, then there are ﬁve instances of that semaphore.
Under what circumstances would you use a binary semaphore rather than a mutex for mutual exclusion? 4. There is only one public resource that can be owned by a thread. Which resource is that? 5. Suppose you have a choice in using either a memory byte pool or a memory block pool. Which should you choose? Justify your answer. 6. What does it mean to get an instance of a counting semaphore? 7. What is the maximum number of numeric combinations that can be represented by an event ﬂags group? 8. Messages are usually added to the rear of a message queue.