Example programmes for parallel systems-adding element, Computer Networking

Assignment Help:

Example Programmes for Parallel Systems

Now we shall complete this with the examples on shared memory programming.

Example 13: Adding elements of an array using two processor int sum, A[ n] ; //shared variables

void main ( ){

int i ;

for (i=0; i

// now create process to be implemented by processor P1

fork(1) add (A,n/2,n-1, sum); // process to add elements from index n/2 to -

1.sum is output variable         // now create process to be implemented by processor

 P0                                                                                           add (A,0,n/2-1, sum);

join 1 ;

printf ("%d", sum);

}

add (int A[ ], int lower, int upper, int sum) {

int sum1=0, i;

 for (i=lower; i<=upper; i++)

sum1=sum1+A[i];

lock sum;

sum=sum+sum1;

unlock sum ;

}

In this program, the last half of the array is passed to processor P1 which adds them. Meanwhile processor P0 adds the first half of the array. The variable sum is locked to avoid inconsistency.


Related Discussions:- Example programmes for parallel systems-adding element

Network virtual terminal - transport layer , Normal 0 false f...

Normal 0 false false false EN-IN X-NONE X-NONE

Efficiency vs. number of processors, Efficiency :- The other main metr...

Efficiency :- The other main metric used for performance measurement is efficiency of parallel computer system i.e. how the resources of the parallel systems are being utilized

Define the bulletin board intranet, Define the Bulletin Board Intranet ...

Define the Bulletin Board Intranet This type of Intranet in an organisation extends to everyone the capability to review or update information that would normally be placed

What is frequency borrowing, What is Frequency borrowing In the simples...

What is Frequency borrowing In the simplest case, frequencies are taken from adjacent cells by congested cells. The frequencies can also be assigned to cells dynamically.

Show the data encryption standard, Q. Show the Data Encryption Standard? ...

Q. Show the Data Encryption Standard? Data Encryption Standard - Bit-level encryption method designed by IBM - Adopted as standard for nonmilitary and nonclassified us

Connection, how to connect two pc in lan?

how to connect two pc in lan?

Define choke packet and implicit congestion signalling, Define Choke packet...

Define Choke packet and Implicit congestion signalling Choke packet: A choke packet is a control packet produced at a congested node and transmitted back to a source node to co

What do you understand by osi, Q. What do you understand by OSI? Ans: T...

Q. What do you understand by OSI? Ans: The Open System Interconnection (OSI) reference model illustrates how information from a software application in one computer goes throug

List the advantages of microwaves, List the Advantages of microwaves.  ...

List the Advantages of microwaves.  a. They need no right of way acquisition among towers. b. They can carry high quantities of information because of their high operating f

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd