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What is the main purpose of demand paging in operating systems?
What is the main purpose of demand paging in operating systems?
- To load all pages into memory immediately
- To efficiently manage memory resources by loading pages from secondary storage into primary memory only when needed (correct)
- To reduce the efficiency of the system by constantly loading pages from secondary storage
- To limit the number of processes that can be accommodated in main memory
What happens when a page fault occurs in demand paging?
What happens when a page fault occurs in demand paging?
- The computer shuts down to prevent further errors
- The operating system loads all pages into memory immediately
- The operating system ignores the page request and halts the process
- The operating system locates a free page in memory, transfers the requested page from secondary storage, updates the page table, and resumes the interrupted program (correct)
How does demand paging help in overcoming the limitations of main memory size?
How does demand paging help in overcoming the limitations of main memory size?
- By halting processes that request pages not in memory
- By loading pages from secondary storage into primary memory only when needed (correct)
- By loading all pages into memory at once
- By reducing the number of processes in main memory
What is one benefit of demand paging in terms of resource allocation?
What is one benefit of demand paging in terms of resource allocation?
How does demand paging impact the initial overhead involved in loading a program into memory?
How does demand paging impact the initial overhead involved in loading a program into memory?
In demand paging, what occurs when a process requests access to a page that is not in memory?
In demand paging, what occurs when a process requests access to a page that is not in memory?
What is the purpose of the substring() method in Java?
What is the purpose of the substring() method in Java?
Which method is used for splitting a string into multiple parts based on a defined pattern?
Which method is used for splitting a string into multiple parts based on a defined pattern?
What does the concat() method do when used to concatenate strings in Java?
What does the concat() method do when used to concatenate strings in Java?
Why are strings considered immutable in Java?
Why are strings considered immutable in Java?
Which method can be used to retrieve the character at a specific index within a string?
Which method can be used to retrieve the character at a specific index within a string?
What does the length() method in Java return?
What does the length() method in Java return?
What is the output of the following code snippet? String str = "Hello"; System.out.println(str.charAt(4));
What is the output of the following code snippet? String str = "Hello"; System.out.println(str.charAt(4));
Which of the following statements about string comparison in Java is correct?
Which of the following statements about string comparison in Java is correct?
What is the result of the following operation? "Hello " + "World"
What is the result of the following operation? "Hello " + "World"
Which of the following methods can be used to split a string into an array of substrings?
Which of the following methods can be used to split a string into an array of substrings?
What is the output of the following code snippet? String str = " Hello World "; System.out.println(str.trim());
What is the output of the following code snippet? String str = " Hello World "; System.out.println(str.trim());
Which of the following statements about string concatenation in Java is true?
Which of the following statements about string concatenation in Java is true?
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Study Notes
Demand Paging
Demand paging is a strategy used by operating systems to efficiently manage memory resources in computers. It involves loading pages from secondary storage (like hard drives or solid-state drives) into primary memory (Random Access Memory or RAM) only when they are needed, rather than loading all pages into memory immediately. This approach helps in overcoming limitations of main memory size and increasing efficiency by utilizing the slower secondary storage for infrequently accessed data.
In demand paging, the operating system keeps track of which pages are currently in memory and which are not. When a process requests access to a page that is not in memory, a page fault occurs. The operating system then locates a free page in memory, transfers the requested page from secondary storage to the identified free page, updates the page table, and resumes the interrupted program.
The benefits of demand paging include improved memory utilization and reduced memory pressure. Since not all pages are loaded at once, more processes can be accommodated in the main memory, leading to better resource allocation and overall system performance. Additionally, demand paging reduces the initial overhead involved in loading a program into memory, as only essential pages are loaded initially.
However, while demand paging offers many advantages, it is not without drawbacks. There is a delay associated with each page fault, as the memory system must retrieve the required page from secondary storage. Furthermore, excessive page faults can lead to a phenomenon known as thrashing, where the system spends too much time swapping pages between memory and secondary storage, causing performance degradation.
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