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Q1) Consider a single-process web server that serves static HTTP requests. Requests arrive at the server with inter-arrival times that are exponential random variables with mean 0.5 seconds. In the web server context, the service time of a request can be estimated at the outset based on the size of the requested file. Assume that each request upon arrival specifies the size of the download, and that the file sizes are exponential random variables with mean 125 KB. A request arriving at the server may either immediately start receiving service (if the server process is idle) or queue for service (if the server process is busy servicing another request). Requests in queue are served according to the scheduling policy in use:
a) First-In-First-Out (FIFO) scheduling
b) Shortest Job First (SJF) scheduling,
The software house has been contacted by a Governmental Nuclear Reactor Agency that wants to change the current Operating System of their plant.
Discuss and provide examples of the following concurrency issues associated with an OS: 1. Mutual exclusion 2. Deadlock 3. Starvation
Explain a complication that concurrent processing adds to an operating system.
n a competitive market place (pure competition) is it possible to continually sell your product at a price above the average cost of production.
Assume that word 0 is part of a hole and that the highest word in memory contains valid tries are needed in the page table if traditional(one-level) paging is used? how many page table entries are needed for two-level paging, with 10 bits in ea..
What is race condition in this protocol?debitcard machine determine current value of card in dollars which is stored in value x.
CPU with interrupt-driven I/O is busy servicing disk request. While CPU is midway through the disk-service routine, another I/O interrupt occurs. What occurs next?
In different communications models, communication may take place using either "message passing" or "shared memory". Distinguish between "message passing" and "shared memory", illustrating your answer with a diagram Give three advantages of virt..
What are the three different categories of command, support your answer by giving three examples. Give three good reasons, with valid explanation, to justify why partitioning hard disk provides a variety of advantages. Explain the client/server..
The purpose of this program is to change such that it makes use of the IPC facilities provided by UNIX.
Write two challenges an OS faces when passing parameters between user and kernel mode. Describe how an OS can overcome them
Virtual machines supported by a host operating system
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