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CS533 Concepts of Operating Systems Class 6 The Duality of Threads and Events
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CS533 - Concepts of Operating Systems 2 Questions Are event-based and multi-threaded programming really duals of each other? How does message communication map to procedure call/return? o Synchronous message passing o Asynchronous message passing Are they the same underneath? o How would you implement message passing? o How would you implement procedure calling?
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CS533 - Concepts of Operating Systems 3 Questions Should the choice depend on the underlying architecture? o What does this mean anyway? Is the cost of synchronization for sharing in-place in thread models the same as the cost of copying for message passing models? o Does hardware provide better support for one than the other?
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CS533 - Concepts of Operating Systems 4 Questions What is the costs of pushing state onto the stack and popping it off, vs the cost of allocating copying then freeing message memory? o How would you optimize local message passing? o What conventions would you need to follow to avoid needing synchronization? o How does this compare to local state in procedure calling? o How might you optimize pointer passing? o What does this remind you of?
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CS533 - Concepts of Operating Systems 5 Questions Is threading just an automated pattern of memory management that is done manually in event models? Do the two models have equal memory consumption? o Did it matter before, and does it today? o Is over-allocation of memory inevitable in thread-based systems?
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CS533 - Concepts of Operating Systems 6 Questions Do both models present the same scheduling choices? o Do they have the same locality of reference behavior? o Does this matter? Are both models equivalent with respect to dynamic allocation of hardware resources (CPUs)? Are both models equivalent with respect to maintaining processor affinity? o Is it better to maintain good code locality or good data locality?
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CS533 - Concepts of Operating Systems 7 Questions What are the relative levels of abstraction for o Threads/procedures o Events/messages o Monitors What is the relationship between design patterns and programming language support for a model?
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CS533 - Concepts of Operating Systems 8 Reminder Class 7 presenters o Discuss your presentation plans with me ahead of time o Mail me the final version of your slides BEFORE the class
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