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2 years ago

Which threading model is best for achieving true parallelism and how?

Computers and Technology

1 answer:

WITCHER [35]2 years ago

7 0

Answer:

The explantion of this question is given below in the explanation section.

Explanation:

Parallelism means that an application is split into smaller subtasks that can be processed in parallel on multiple CPU at the same time. Parallelism is related to application handling individual tasks on multiple CPUs. To achieve true parallelism your application must have more than one thread running, schedule the task into other threads, graphics cards, and CPU, etc.

It is noted that parallelism is a concept while multiple threading in computer programing is its implementation. Some operating systems provide a multiple threading that combined the user-level thread and kernel-level thread facility. In such a system, multiple threads within the same application can run in parallel on multiple CPU or processors

There are three types of Multithreading Model

• Many to many relationships.

• Many to one relationship.

• One to one relationship.

Many to many relationship

This model multiplexes any number of user threads onto an equal or smaller number of kernel threads. However, this model provides the best accuracy to concurrency. However, using this model, true parallelism can be achieved, if the system has multiprocessor.

Many to One model

This model maps the user-level threads to one kernel-level thread and its management is done in userspace by the thread library. In this model, only one thread can access the Kernal at a time, so multiple threads are unable to run on multiple CPU in parallel.

One to one relationship

This model provides one to one relationship between the user and kernel-level thread. This model is better than the many-to-one model. It allows another thread to execute when a thread makes a blocking system call. However, it supports multiple threads to execute in parallel on the microprocessor. This model provides true parallelism.

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When do we use an if- statement

wel

Answer:

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Explanation:

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3 years ago

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rewona [7]

Answer:

False

Explanation:

The private member of a class is not accessible by using the Dot notation ,however the private member are those which are not accessible inside the class they are accessible outside the class .The public member are accessible inside the class so they are accessible by using the dot operator .

Following are the example is given below in C++ Language

#include<iostream> // header file

using namespace std;

class Rectangle

{

private:

double r; // private member

public:

double area()

{ return 3.14*r*r;

}

};

int main()

{

Rectangle r1;// creating the object

r1.r = 3.5;

double t= r1.area(); // calling

cout<<" Area is:"<<t;

return 0;

}

Output:

compile time error is generated

The correct program to access the private member of class is given below

#include<iostream> // header file

using namespace std;

class Rectangle

{

private:

double r; // private member

public:

double area()

{

r1=r;

double t2=3.14*r2*r2;

return(t2); // return the value

}

};

int main()

{

Rectangle r1;// creating the object

r1.r = 1.5;

double t= r1.area(); // calling

cout<<" Area is:"<<t;

return 0;

}

Therefore the given statement is False

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3 years ago

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Answer:

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Explanation:

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iragen [17]

Answer:

Explanation:

The following is the entire running Java code for the requested program with the requested changes. This code runs perfectly without errors and outputs the exact Sample Output that is in the question...

public class ScopeTester

{

public static void main(String[] args)

{

Scope scope = new Scope();

scope.printScope();

}

public class Scope

{

private int a;

private int b;

private int c;

public Scope(){

a = 5;

b = 10;

c = 15;

}

public void printScope(){

System.out.println("a = " + a);

System.out.println("b = " + b);

System.out.println("c = " + c);

System.out.println("d = " + getD());

System.out.println("e = " + getE());

}

public int getA() {

return a;

}

public int getB() {

return b;

}

public int getC() {

return c;

}

public int getD(){

int d = a + c;

return d;

}

public int getE() {

int e = b + c;

return e;

}

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2 years ago