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We will brie?y introduce paging to ?nish off this lecture. When a process is loaded, not all of the pages are immediately loaded, since it's possible that they will not all be needed, and memory is a scarce resource. The process' virtual memory address space is broken up into pages, and pages which are valid addresses are either loaded or not loaded. When the MMU encounters a virtual address which is valid but not loaded (or "resident") in memory, then the MMU issues a pagefault to the operating system. The OS will then load the page from disk into RAM, and then let the MMU continue with its address translation. Since access times for RAM are measured in nanoseconds, and access times for disks are measured in milliseconds, excessive pagefaults will clearly hurt performance a lot.
What are the advantages of Contiguous allocation? The advantages are a. Supports direct access b. Supports sequential access c. Number of disk seeks is minimal.
Now, let us discuss two related algorithms for deciding which pages to evict. The clock algorithm is one of the most popular choices. It works by keeping frames in a circular struc
OPERATING SYSTEM 1. Describe the term operating system. Write down the functions of operating system. 2. Explain Thread? Write down the advantages and disadvantages of threa
Write a note on the usage of semaphores. Semaphore is a synchronization tool and it is a variable having integer values. It is accessed only by two standard atomic operations w
What is sector sparing is proper definition
(a) Describe services of operating systems. (b) Differentiate among the short term, medium term and long term scheduling that are given by multi-tasking operating systems.
What is a Relocatable program? The Relocatable programs can be loaded almost anywhere in memory.
MEMORY MANAGEMENT USING LINK LISTS The first one is for showing it is process or hole, second is for starting address and third is for length of the process and last is a point
See attachemnt
Explain the Application Interaction Protocols Application interaction protocols are uniquely defined for each program and are used to logically describe the data being passed b
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