2001sp - CS 414 Operating Systems Midterm, Spring 2001...

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CS 414 Operating Systems Midterm, Spring 2001 Prof. Emin Gün Sirer Name:_________________________________________ NETID:_________________ This is a closed book examination. It is four (4) pages long. An incorrect answer to a true/false question will receive a negative score of –2 to offset a correct answer. Consequently, randomly guessing answers is not a good strategy. Show your work for partial credit. [16] 1. Indicate if the following statements are true (T) or false (F). _____ Hard real-time operating systems must provide fast response to interrupts. _____ I/O buffering can increase CPU utilization. _____ One of the ways direct memory access (DMA) improves system performance is by reducing the number of interrupts required to complete an I/O operation. _____ Modifying the page table base register requires a protected instruction. _____ A cycle in a resource allocation graph (RAG, as described in the book and in lectures; namely, each process and resource is a node, edges represent resource requests and assignments) implies that the system is deadlocked. _____ For large networks, a ring-shaped network topology, on average, achieves shorter routes than a star topology. _____ With asynchronous I/O, programs cannot make forward progress until their I/O operations complete. _____ The end-to-end argument indicates that deadlock detection and recovery are not critically
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2001sp - CS 414 Operating Systems Midterm, Spring 2001...

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