Question at position 33 With ________ memory, users are allowed to open more programs and data files than there is room for in the computers RAM.virtualbankableflashswappable单项选择题
A
virtual
B
bankable
C
flash
D
swappable

Question

Question at position 33 With ________ memory, users are allowed to open more programs and data files than there is room for in the computers RAM.virtualbankableflashswappable

BlackTom AI · Accepted Answer

Virtual memory allows a computer to run more programs and open more data files than the physical RAM can hold by using disk space as an extension of memory.

1) Relevant knowledge points and concepts
- RAM (physical memory) stores active data and code for fast access.  
- Virtual memory is an OS feature that provides each process with a large virtual address space mapped to physical RAM and a backing store (typically a disk file or swap partition).  
- Paging and swapping: memory is divided into fixed-size pages; when a needed page is not in RAM, the OS triggers a page fault and loads the page from disk, possibly writing another page back to disk.  
- Page tables map virtual addresses to physical frames.

2) Step-by-step reasoning
- Suppose a system has 4 GB of RAM but active processes require 6 GB of memory.  
- The OS gives each process a virtual address space totaling 6 GB (or more). Pages needed immediately reside in RAM until RAM is full.  
- When RAM is full and another page is needed, the OS selects a page to evict (page replacement algorithm), writes it to the swap file (on disk), and loads the requested page from disk into the freed frame.  
- From the process’s viewpoint, it has continuous memory larger than RAM; the OS transparently moves pages between RAM and disk.

3) Example calculation / intermediate steps
- RAM = 4 GB, required = 6 GB → virtual memory provides the extra 2 GB on disk.  
- Page size = 4 KB → 6 GB / 4 KB = 1,572,864 pages total. Page table maps those virtual pages to physical frames or swap locations. Page faults occur when referenced pages are not in physical frames.

4) Why the correct answer is correct
- “Virtual” (virtual memory) is the standard term describing this mechanism of extending RAM with disk-backed storage to allow more programs/data than RAM alone would permit.

5) Why other options are incorrect
- “Bankable” is not a standard term in memory management.  
- “Flash” refers to a type of non-volatile memory (flash storage) but is not the general mechanism OSes call virtual memory; using flash does not automatically provide the OS-level virtual memory abstraction.  
- “Swappable” describes an attribute (can be swapped out) but is not the name of the memory management technique; the proper noun is “virtual memory.”

6) Conclusion
The correct answer is “virtual,” which matches the provided answer.

Question at position 33 With ________ memory, users are allowed to open more programs and data files than there is room for in the computers RAM.virtualbankableflashswappable单项选择题

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