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COMPUTER ORGANIZATION & ARCHITECTUREDefine paging in memory management and write its advantages.201514mOperating SystemConsider the virtual page reference string 0, 4, 8, 20, 24, 36, 44, 12, 68, 72, 80, 84, 28, 32, 88, 92 on a demand paged virtual memory system running on computer system that has main memory of size 4 page frames which one initially empty. The CPU uses LRU page replacement policy. (i) How many page faults does this sequence cause? (ii) What are the page numbers of the pages present in the main memory at the end of the sequence?20227mOPERATING SYSTEMConsider a demand-paging system with a paging disk that has an average access and transfer time of 20 milli-seconds. Addresses are translated through a page table in main memory, with an access time of 1 microsecond per memory access. Thus, each memory reference through the page table takes two accesses. To improve this time, we have added an associative memory that reduces access time to one memory reference if the page-table entry is in the associative memory. Assume that 80 percent of the accesses are in the associative memory and that of those remaining, 10 percent (or 2 percent of the total) cause page faults. What is the effective memory access time?20227mOperating SystemExplain the Address Translation mechanism in Paging. Why is the page size normally some power of two?20247m
PreviousWhich of the following is a potential result of bad blocks on a disk? (i) Faster access time (ii) Increased storage capacity (iii) Data loss or corruption (iv) Improved disk schedulingNextWhat is the main problem that the "Critical Section" concept aims to solve in concurrent programming? (i) Memory overflow (ii) Infinite loop termination (iii) Race condition between processes (iv) Lack of CPU resources