RAM that can be changed. True or False

Computer system with a 32-bit logical address and 4k-byte page size. assume that each entry of a page table consists of 4bytes.

Annette [7]

The number of bits in the physical address is 26 bits. The number of entries in a page table is $\mathbf{2^{20}}$ entries. The size of the page table in a one-level paging scheme is 4MB.

<h3>
What is paging in Operating System?</h3>

Paging is a storage method used in operating systems to recover activities as pages from secondary storage and place them in primary memory. The basic purpose of pagination is to separate each procedure into pages.

We are given the following parameters:

32-bit logical address
Page size = 4 KB = $\mathbf{2^{12} \ bytes }$
Size of each Page table entry = 4 bytes

Suppose the system supports physical memory size = 64 MB = $\mathbf{2^{26} \ bytes}$

Thus, the number of bits in the physical address is computed as:

= $\mathbf{log_2 \{Physical-memory-size\}}$

$=\mathbf{log_2(2^{26})}}$

= 26 bits

The number of entries in a page table = logical address space size/page size

The number of entries in a page table $\mathbf{= \dfrac{2^{32}}{2^{12}}}$

$\mathbf{=2^{20}}$ entries

In a one-level paging scheme, the size of the table is:

= entire no. of page entries × page table size

= $\mathbf{2^{20}\times 4 \ bytes}$

= 4 MB

b.

suppose that this system supports up to 2^30 bytes of physical memory.

The size of the page table will be the same as 4 MB due to the fact that the number of entries, as well as, the page table entry size is the same.

Since the size of the page table surpasses that of a single page. A page cannot include a whole page table. Therefore, the page table must be broken into parts to fit onto numerous pages, and an additional level of the page table is required to access this page table.

This is called the Multi-Level Paging system.

Therefore, we can conclude that the number of bits in the physical address is 26 bits, the number of entries in a page table is $\mathbf{2^{20}}$ entries, and the size of the page table in a one-level paging scheme is 4MB.

Learn more about Paging in Operating System here:

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4 0

1 year ago

1. Fill in the blanks:

Anit [1.1K]

Answer:

<h2>a) computer software </h2>

<h2>b) flash drive</h2>

<h2>c) Latin "putare" </h2>

<h2>d) Hardware</h2>

<h2>e) software</h2>

hope it's helpful ✌

8 0

3 years ago

X = 1 if (A = 1 OR B = 1) OR (A = 0 AND B = 1

Gnoma [55]

Answer:

For question a, it simplifies. If you re-express it in boolean algebra, you get:

(a + b) + (!a + b)

= a + !a + b

= b

So you can simplify that circuit to just:

x = 1 if b = 1

(edit: or rather, x = b)

For question b, let's try it:

(!a!b)(!b + c)

= !a!b + !a!bc

= !a!b(1 + c)

= !a!b

So that one can be simplified to

a = 0 and b = 0

I have no good means of drawing them here, but hopefully the simplification helped!

4 0

3 years ago

Create a new file that builds a shopping list from a user. There should be a input query that asks the user to list an item and

levacccp [35]

Answer:

Check the output

Explanation:

# -*- coding: utf-8 -*-

"""

Created on Thu Apr 12 00:39:11 2018

author:

"""

stocks ={

"tomato soup": 20,

"cheese": 8,

"bread": 6,

"milk": 8,

"butter": 7,

"coffee": 8,

"ice cream": 5,

"orange juice": 12,

"bacon": 6,

"tortilla chips": 14,

"ramen": 24 }

prices ={

"tomato soup": 1.85,

"cheese": 3.99,

"bread": 2.50,

"milk": 3.59,

"butter": 1.99,

"coffee": 5.99,

"ice cream": 2.99,

"orange juice": 2.50,

"bacon": 5.49,

"tortilla chips": 3.00,

"ramen": 0.99 }

def grocery_cost(item_list,quantity_list):

totalcost = 0

for i in range(len(item_list)):

totalcost=totalcost+(quantity_list[i]*prices[item_list[i]])

return totalcost

def stock(item):

print("Number of itmes present in the stock:",stocks[item])

print("Welcome to the on-line grocery store!!")

print("Items that are available for purchase:")

for key in stocks.keys():

print(key)

#chosen foods

print("Enter the item with quantity or Enter 'Q' when you are done")

item_list=[]

quantity_list=[]

while True:

item=input('Enter the item name: ')

if item=='Q' or item=='q':

break

item_list.append(item)

while True:

quan=int(input('Enter the number of item: '))

if stocks[item] >=quan:

quantity_list.append(quan)

break

else:

stock(item)

print('Your requirement is higher than stock available. Please enter again!!')

print("\nTotal cost:", "$",grocery_cost(item_list,quantity_list))

Kindly check the output in the attached image below.

7 0

3 years ago

What web 2.0 features allows users to subscribe to a data plan that charges for the amount of time spent on the internet?

galina1969 [7]

Answer:

The answer to this question is given in the explanation section. The correct option is long tail

Explanation:

a.Folksonomy

Folksonomy is a way of organizing data and digital content. With Web 2.0, users can collaboratively manage and tag photos, journals and other media. As more users do this, creates a system of classification for the media and information. so this option is not correct

b. long tail (correct option)

Some sites are able to offer services as well in which users can subscribe monthly or pay a fee every so often. An example of this would be Netflix.

c.user participation

All users have the free will to contribute to the site which makes many Web 2.0 pages public. With sites such as Wikipedia, anyone is open to the editing of articles. Information is provided two-way instead of solely from the site owner.

d.application

Web 2.0 applications that allow anyone to create and share online information or material they have created. As you know that there are number of different types of web 2.0 applications including wikis, blogs, social networking, folksonomies, podcasting & content hosting services.

3 0

3 years ago