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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.
Qqueue for service (if the server process is busy servicing another request). Requests in queue are served according to the scheduling policy in use: First-In-First-Out (FIFO) scheduling.
Given that main memory is consisted of three page frames for public use and that seven-page program (with pages a, b, c, d, e, f, g) requests pages in the following order: a, b, a, c, d, a, e, f, g, c, b, g.
How many page faults are generated by the following arrayinitialization loops, using LRU replacement, and assuming page frame 1 has the process in it, and the other two are initially empty.
The Shortest Job Next (SJN) algorithm queues processes in a way that the ones that use the shortest CPU cycle will be selected for running rst.
What is race condition in this protocol?debitcard machine determine current value of card in dollars which is stored in value x.
Forking the child process
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..
Simulate the long-term scheduler, the short-term scheduler and the I/O scheduler of the computer using the First-Come-First-Serve algorithm.
Develop a user mode command interpreter which support list-short.
Construct a resource allocation graph with the following processers and resources, the system consists of four processers P1, P2, P3, and P4 and five resources R1, R2, R3, R4, and R5.
Implement the parser in a separate file. Implement the main parser function in a separate file main.c
Consider a dynamic RAM that must be given a refresh cycle 64 times per ms. What percentage of the memory's total operating time must be given to refreshes?
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