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PSY 325 Final Exam –All 3 Essays.

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CIS 512 Assignment 4 The Virtual Memory Manager
Most operating systems use a virtual memory manager (VMM) whose responsibility is to manage
the relationship between the virtual organization of memory as seen by an application with the
physical organization of memory from the operating system’s point of view. Virtual memory
addresses must be mapped to physical address and vice versa.
Write a four to five (4-5) page paper in which you: Differentiate between virtual memory and
physical memory. Evaluate the benefits gained by running applications when the operating
system uses a virtual memory manager. Analyze how virtual memory addresses get translated
into physical addresses. Analyze how a modern operating system translates 32-bit and 64-bit
virtual addresses to physical addresses on the same machine. Create a relationship diagram,
using MS Visio or Dia, depicting the relationship between virtual addresses to physical
addresses. Note: The graphically depicted solution is not included in the required page length.
Use at least three (3) quality resources in this assignment. Note: Wikipedia and similar Websites
do not qualify as quality resources. Your assignment must follow these formatting requirements:
Be typed, double spaced, using Times New Roman font (size 12), with one-inch margins on all
sides; citations and references must follow APA or school-specific format. Check with your
professor for any additional instructions. Include a cover page containing the title of the
assignment, the student’s name, the professor’s name, the course title, and the date. The cover
page and the reference page are not included in the required assignment page length. Include
charts or diagrams created in Visio or an equivalent such as Dia. The completed diagrams /
charts must be imported into the Word document before the paper is submitted. The specific
course learning outcomes associated with this assignment are: Describe the functions, layers,
and resources of an operating system. Use technology and information resources to research
issues in enterprise architecture. Write clearly and concisely about Advanced Computer
Architecture topics using proper writing mechanics and technical style conventions.
The Virtual Memory Manager (Vmm)
The Virtual Memory Manager (VMM)
The Difference between virtual memory and physical memory
Physical memories are the RAM chips purchased and placed in a slot
on the computer motherboard. The RAM is the first memory used
when the computer requires memory usage, such as for loading an
application or opening a document.
ϖ Virtual

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Virtual memory is stored on the hard drive. Virtual memory is used
when the RAM is filled. Virtual memory is slower than physical
memory, so it can decrease the performance of applications.
ϖ Allocation
Physical memory allocates information in a "first in, last out" process.
The information is placed on the stack. Virtual memory uses a process
called paging. These pages are laid across the hard drive in fixed
sizes.
ϖ Size
1. Physical memory is limited to the size of the RAM chips installed
in the computer. Virtual memory is limited by the size of the hard
drive, so virtual memory has the capability for more STORAGE.
2. Virtual memory is a memory management technique developed for
multitasking kernels.
3. In virtual memory Operating systems have memory areas that are
pinned (never swapped to secondary storage). For example, interrupt
mechanisms rely on an array of pointers to their handlers, such as I/O
completion and page fault. If the pages containing these pointers or
the code that they invoke were pageable, interrupt-handling would
become far more complex and time-consuming, particularly in the
case of page fault interruptions. Hence, some part of the page table
structures is not pageable (SPECTORA).
1) Physical Memory is the actual memory chips inside your computer.
It's a very fast type of memory that the computer can access very
quickly and efficiently.
2) Virtual Memory is a space on your hard drive. The computer uses
this from time to time instead of using the physical memory. As this is
space on the hard drive accessing it is not as fast as normal memory.
3) Your computer uses Virtual Memory during normal operation, but
if your computer begins to run out of physical memory then your
computer will resort to using the virtual memory more often.

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