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You are asked to design the virtual memory system for a new operating system working on small mobile devices. The memory operates at 333 MHz with a word size of 4 bytes. Swapped pages are stored on a flash memory drive which has a latency of 0.24 ms and bandwidth of 40MB/s.
A typical device is expected to have physical memory of 16 MB. It is expected to run 8 programs simultaneously. Each of the programs has a 32 bit address space. The typical program allocates 16MB of memory with a working set size of 1MB. Each of these programs can experience a page fault at any moment. For user experience reasons, the OS can not spend more than 30ms in handling the page fault.
Using this information, select an appropriate page size and page table organization (if possible). Because of cost reasons, you must ensure that no more than 5% of the memory is used for page table storage.
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Intermediate Level Tasks : Below is a simple program. It creates 2 threads. The first thread keeps printing out X on the screen, and the second thread keeps printing out O on the screen.
Explain the following terms in relation to linear programming problems- (1) decision variables (2) objective function
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What is the main advantage of multiprogramming How does the distinction between the monitor mode and user mode function as a rudimentary form of protection (security) system What is the difference between a trap and an interrupt? What is the u..
Discuss and provide examples of the following concurrency issues associated with an OS: 1. Mutual exclusion 2. Deadlock 3. Starvation
Formulate the linear programming model for this problem Plot a graph indicating and labelling clearly all the constraints, the feasible region (R) and the optimal point (X)
Use the semaphore methods to control the concurrency of the solution
What is minimum number of page faults for the optimal page replacement strategy? Please show how the page is placed and how page faults occur.
Computer has 16 pages of virtual address space but only three physical pages frames. Initially physical memory is empty. Program references virtual pages in order 1,2,3,4,5,3,4,1,6,7,8,7,8,9,7,8,9,5,4,5,4,2 Which references a page fault with LRU ..
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