This website uses cookies to ensure you have the best experience. Learn more

A Look Into Computer Memory Essay

1571 words - 7 pages

A Look into
Computer Memory

Table of Contents
Abstract 3
A Look into Computer Memory 4
Memory Hierarchy 4
Allocation Policies 5
Relocation Policies 6
Hit and Hit Ratio 6
Modern Computer Applications 7
Conclusion 7
References 8


Abstract
The memory of a computer is a key component of the overall architecture of a computer. Several types of memory exist with the architecture of the computer which collectively is known as the memory hierarchy. The use of the memory hierarchy, placing and moving information, is effected by the allocation and relocation policies. How well these policies allow the processor to find the information it is looking for, known as a hit, is ...view middle of the document...

The memory hierarchy is made up of these various levels of memory. A typical hierarchy, including size and cost, can be seen in Figure 1 with the smallest, fastest, and most expensive at the top of the pyramid. The register memory is available directly to the processor and is labeled Level 0. This memory is used explicitly for load/store instructions. In Figure 1, Level 1 memory is called the Cache 1 memory with Level 2 memory called the Cache 2 and so forth. Level 1 and Level 2 memories are typically part of the processor chip in order to allow direct access to the memory locations by the processor. Level 3 memory is the RAM installed on the motherboard of the computer and has an access time of hundreds of nanoseconds. The next level of memory, Level 4, which is considered the directly connected disks of the system, which have a significant amount of access time which is in the tens of milliseconds. Level 5 memory can be network storage or tape drives which may take minutes to access the appropriate data. It is worth noting the right hand column in Figure 1 showing the reduction in cost per GB as the size increases and the access speed decreases. To obtain high speed at an affordable cost, large amounts of information (programs and large data sets) is stored in the slower memory locations and moved into the faster memory locations, preferably before it is needed by the processor (Parhami, 2005, pp. 329-331).
Allocation Policies
Allocation policies determine where data will be placed within the memory hierarchy. The allocation policy is executed by the memory manager. The memory manager play an intricate part in maintaining the performance of the processor by keeping the immediately needed data in the optimal location for processor access to prevent delay in retrieving the information from slower access locations. There are three primary strategies that can be used for memory placement. They are Best Fit, First Fit and Worst Fir. When using the Best Fit policy, the memory manager looks for the closest fitting empty location where the data will fit without as little wasted space as possible. It is worth noting that the best fit location may not be the first available location where the data would fit. For placing the data in the first location where it will fit, the First Fit policy is used. This policy puts the data into the first location it fits with no regard for the amount of remain space after the data. Finally in Worst Fit, the memory manager looks for the largest location available to place the data with the end goal of having the maximum amount of space left available to place additional data into the remaining location (Virginia Polytechnic Institute and State University, 2013).
Relocation Policies
Relocation occurs when the OS loads a solid block of memory for a process. The first physical location of the process is known as the relocation address or base address. There are two types of relocation, static and dynamic. Static...

Other Essays Like A Look Into Computer Memory

Plato a Look Into the Man and His Ideas

1794 words - 8 pages Tim Fox Professor Nicholas His. 100 2/20/10 Plato A look into the man and his ideas Throughout history there have been many philosophers who have revolutionized thinking but perhaps the most important one was Plato. His ideas were unheard of in the times of ancient Greece and influenced not only future philosophers but the common man as well. He has written many dialogues and books over time that has expressed his ideas, like “Phadeo” and

A LOOK INTO SOCIAL SECURITY By, Pang Yang

1901 words - 8 pages TAKING A LOOK AT THE SOCIAL SECURITY PROGRAM IN THE UNITED STATESThe United States have two important economic goals. The two that are widely held are economic security and an equitable distribution of income. The U.S. uses to major tools to try to achieve these goals are the progressive tax system and the income and the income maintenance programs. Income maintenance programs include social insurance programs and public assistance programs. The

A Look Into The Economics Of The Shipping Business

1893 words - 8 pages 2010 GUC – MBA 1st Term Cairo - Egypt Business Economics Research Paper A look into the Economics of the shipping business. Mai Hamed 12/27/2010 Table of Contents List of Figures ................................................................................................................................................ 3 List of Tables

A Contemplative Look Into Cuban Migration To The United States

1872 words - 8 pages A Contemplative look into Cuban Migration to the United States "And we have to get separate because of the system, the new system ... I was so happy. I was born in a fishing town. The ocean was very close; I like to swim, play like every boy...Just the system changed, and everything changed you know, in my life, and the life of all my family and the many families in Cuba ..." (Edsall, Riviera & Cooper, 2009). Victor, a Cuban immigrant

A Look Into a Life

590 words - 3 pages torture. Marjane felt awful after hearing this and attempted to reconstruct one of her grandfather's tortures, being partially submerged in water for hours at a time, by staying in the tub for several hours. Section 4 (Persepolis): Marjane's grandmother comes into town to visit and tells Marjane about the hardships and poverty of years past. She told of how she boiled water and pretended to be cooking to hide their poverty from the neighbors

The Origin of Native American Man: a Look at Possible Migrations of Pre-Historic Man Into North America

1880 words - 8 pages The Origin of Native American Man: A Look at Possible Migrations of Pre-Historic Man Into North America Ally Crawford ARC 330 Dr. Ortmann Spring 2011 Abstract The origins of Native American people have been a topic of debate in academia for decades. There have been several theories, up to and including the possibility that Native Americans arrived via alien intervention. The origins of Native Americans are much less fantastic

A True Fake: a Look Into Holden's Contradictions

664 words - 3 pages The Catcher in the Rye by J. D. Salinger is told in first person by the main character and narrator Holden Caulfield. Holden directly launches into his contradictory nature even on the first page. This does not stop throughout the whole of the book. Holden begins to contradict himself every time he has opinion of something that involves himself and another person. There are many accounts of this because contradicting himself seems to be a habit

A Discussion Into The Ways In Which Williams Explores Memory In 'The Glass Menagerie'

992 words - 4 pages Tennessee Williams has shown memory as a distortion of what really happened. The 'Glass Menagerie' is all Tom's memory. If seen from another characters view point or memory, the situations shown may have appeared very different. Williams has explored memory by showing how you can exaggerate certain things in your memory, and also how imagery, symbols and music can play a large part in creating the illusion of memory.Williams has used visual

"The Crucible"- Arther Miller "Selfish Love Of Abigail Williams." A Look Into Abigail Williams Life, And Thoughts

619 words - 3 pages How far will somebody go just for the sake of love? For young, Abigail Williams, she was prepared to take it as far as she possibly can. She causes a great deal of destruction within the town of Salem Village because of her selfish and evil ways. To the people of Salem village she appears to be afflicted by the devil. She is not really cursed by the devil but simply swept away by love. Abigail has remained bitter from the time of her childhood

How to a Computer in Automotive Technology?

563 words - 3 pages MEASURE COMPUTER MEMORY 4 COMPUTER VIRUS 5 COMPUTER TRAINING AT UIRI Computer training at UIRI is taken as course .Those who greatly appreciates it takes it. Training is being carried out in shifts, the morning and afternoon shift. Training takes a period of one month and after wards a candidate is awarded a certificate. Life is what you make of it, if you take it in an easy way it also does the same. Late coming is prohibited, so all

Report To Compare And Contrast The Hardware Specification Of Two Laptops/Desktops Or Servers

2591 words - 11 pages , where your computer's processor is able to access information quickly and as frequently as it needs to. RAM (random access memory) and cache are both examples of main storage devices. Primary storage is the fastest memory in your computer and is used to temporarily store data while the data is being used. For example, when you open a software programme, data is moved from the secondary storage or peripheral storage device into the primary

Related Papers

A Look Into The Human Memory Proocess

1041 words - 5 pages A Look into the Human Memory Process Jasmin Chopper American Intercontinental University Abstract The memory process is comprised of different aspects which a person uses to acquire, retain, store, and later retrieve information. There are different systems of the memory process that are in charge of different types of memories. A stage model is used to help better understand the 3 different stages of memory: sensory memory, short-term

A Look Into Moonshining Essay

691 words - 3 pages A Look into moonshine Hooch, white lightning, mountain dew, moonshine, etc, they are all names for the illeagally made liquor brewed in the mid-Atlantic and southern rural regions of US. The idea of making moonshine came about because the government put such high taxes on liquor it was more cost effective just for the citizens to make their own. There are many variations of the liquor, and just about anything can be thrown into the mix. The

A Look Into The Medical Profession

2911 words - 12 pages recruiting a doctor?” A: “It doesn’t play a large role. We don’t really interview the doctors. It is important in other professions.” 5. Q: “How important is being polite in an interview?” A: “It’s really important. It’s important in any profession.” 6. Q: “When you recruit doctors, what traits do you look for in them?” A: “I look for good training and I look into their background for the quality of care he might provide. I also look for bedside

A Look Into The Heated Stem Cell Research Ethical Debate

1267 words - 6 pages A Look into the Heated Stem Cell Research Ethical Debate Abdullah Alalo Metropolitan Community College A Look into the Heated Stem Cell Research Ethical Debate What would life be like if humans had the ability to regenerate damaged tissues or organs? What would it be like if we had no more chronic diseases that would slow us down? One field of research promises to provide the answers to these questions and a lot more. Stem cell research has