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 clipper, Clipper is a compiler that was well recognized at the time...

Clipper is a compiler that was well recognized at the time of80's and early times of 90's. We can build DOS based applications (even large applications too) using clipper. There is

Connection-oriented service, Sender requests connection from network. Other...

Sender requests connection from network. Other receiver agrees to connection. Computers interchange data through connection. One-endpoint requests network to split connection when

Broadcast and multicast , Broadcast and Multicast : Broadcast and Mult...

Broadcast and Multicast : Broadcast and Multicast :In the broadcast interconnection network, at one time one node transfer the data and all other nodes get that data.  Broadca

Describe the various fibre channel standards, Network Data Storage 1. W...

Network Data Storage 1. What is the Small Computer System Interface Architecture 2. Describe the various Fibre Channel standards. 3. What is the difficulties in building

What is meant by asymmetric multiprocessing (amp), It imposes hierarchy and...

It imposes hierarchy and a division of labor between processors. Only one designated processor, the master, controls (in a tightly coupled arrangement) slave processors dedicated t

State the network environment of intranets and internet, State the Network ...

State the Network environment of Intranets and Internet Intranets as well as the Internet are based purely on networks, the company intending to install Intranet must consider

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

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

Point-to-point message passing, In point-to-point message passing, single p...

In point-to-point message passing, single process sends/receives message to/from another process. There are four communication modes for sending a message: i)    Buffered mode

Cells vs packets, ATM designers select cells over packets because of the fo...

ATM designers select cells over packets because of the following facts: Cells are fixed length and memory management for them is easy. Handling variable length packets tends

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