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

What is meant by transparency, Transparency really means adumbrating the ne...

Transparency really means adumbrating the network and its servers from the users and even the application programmers.

Show the rs232 logic waveform, Q. Show the RS232 Logic Waveform ? RS-2...

Q. Show the RS232 Logic Waveform ? RS-232 Interface Three most important wires for the Serial interface Transmit - Pin 2 Receive - Pin 3 Ground - Pin

Initialization - network layer and routing , Initialization  Imagine t...

Initialization  Imagine that  all routers in our  sample internetwork  comes up  at the  same time. Each router sends a greeting packet to its  neighbours to find  out the  sta

Prototype Web Site for the Computer Superstores, Overview Create a proto...

Overview Create a prototype web site for the "Computer Superstores" company. Your site should use effective navigation features and demonstrate good structure for  accessibility

Categories to access the intranet, Categories to access the Intranet P...

Categories to access the Intranet Persons who can find access to the Intranet can be put into three categories. 1.  Those who can enter the site 2.  Those who can access

Thrift Towne, what role would you assign for Pentium iii, 500 MHz processor...

what role would you assign for Pentium iii, 500 MHz processor, 256 MB memory, 1o GB hard drive

Ip checksum, This code properly implements the IP checksum function on a 32...

This code properly implements the IP checksum function on a 32-bit machine: unsigned short cksum(unsigned short *buf, int count) { unsigned long sum = 0; while (count--) { sum += *

Explain about wireless ethernet, Wireless Ethernet (802.11) a) Operates...

Wireless Ethernet (802.11) a) Operates on physical plus data link layers b) BSS (Basic service set) stationary or mobile wireless stations and a central base station known a

Determine the term- cyberspace, Determine the term- Cyberspace The c...

Determine the term- Cyberspace The conceptual or virtual area where pages, data, images, and all the rest are stored. It is the area from where requests are accepted and ful

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