Assume the following behaviors in a virtual memory system. Reading or writing physical memory requires 50 nanoseconds. Reading or writing disk writing 10 milliseconds. Page size is 8 kilobytes. Presume that the program has 1 megabyte of physical memory available. You may consider everything except the array access itself to take no time. You should also assume that the first 1 megabyte of the array is in physical memory initially. You may ignore any memory used by the program or stack to execute these functions. Using this information, answer the following questions. In each case, show the work you use to calculate the answer. Give your answer in a reasonable unit. a) How many bytes of virtual memory are necessary to hold the entire array? b) How many pages are necessary to hold the entire array? c) Assuming an int requires 4 bytes, which elements of the array will start in physical memory? d) Just considering virtual memory access time, how long will it take for function1() to execute? e) Just considering virtual memory access time, how long will it take for function2() to execute? Remember to account for both read and write activity.
Assume the following behaviors in a virtual memory system. Reading or writing physical memory requires 50 nanoseconds. Reading or writing disk writing 10 milliseconds. Page size is 8 kilobytes. Presume that the program has 1 megabyte of physical memory available. You may consider everything except the array access itself to take no time. You should also assume that the first 1 megabyte of the array is in physical memory initially. You may ignore any memory used by the program or stack to execute these functions. Using this information, answer the following questions. In each case, show the work you use to calculate the answer. Give your answer in a reasonable unit. a) How many bytes of virtual memory are necessary to hold the entire array? b) How many pages are necessary to hold the entire array? c) Assuming an int requires 4 bytes, which elements of the array will start in physical memory? d) Just considering virtual memory access time, how long will it take for function1() to execute? e) Just considering virtual memory access time, how long will it take for function2() to execute? Remember to account for both read and write activity.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:Assume the following behaviors in a virtual memory system. Reading or writing physical
memory requires 50 nanoseconds. Reading or writing disk writing 10 milliseconds. Page
size is 8 kilobytes. Presume that the program has 1 megabyte of physical memory
available. You may consider everything except the array access itself to take no time.
You should also assume that the first 1 megabyte of the array is in physical memory
initially. You may ignore any memory used by the program or stack to execute these
functions. Using this information, answer the following questions. In each case, show the
work you use to calculate the answer. Give your answer in a reasonable unit.
a) How many bytes of virtual memory are necessary to hold the entire array?
b) How many pages are necessary to hold the entire array?
c) Assuming an int requires 4 bytes, which elements of the array will start in physical
memory?
d) Just considering virtual memory access time, how long will it take for function1()
to execute?
e) Just considering virtual memory access time, how long will it take for function2()
to execute? Remember to account for both read and write activity.
![3. Virtual memory
Study the two functions given below. Both use the same array declared as:
static int data[256*256*8];
void function1()
{
int i;
int j;
for (i = 0; i < 32; i++)
for (j = 0; j< 256; j++)
data[i] = i;
}
void function2()
{
int i;
int j;
for (i = 0; i < 32; i++)
for (j = 0; j< 256; j++)
data[j*2048] = i;
}](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff60d9400-faa9-4cea-83a3-a032be966ed4%2F87c25339-de06-4f06-9176-8de54edaca23%2F7f8t3pb_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3. Virtual memory
Study the two functions given below. Both use the same array declared as:
static int data[256*256*8];
void function1()
{
int i;
int j;
for (i = 0; i < 32; i++)
for (j = 0; j< 256; j++)
data[i] = i;
}
void function2()
{
int i;
int j;
for (i = 0; i < 32; i++)
for (j = 0; j< 256; j++)
data[j*2048] = i;
}
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