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

Multiplexing and de multiplexing, Multiplexing  and De multiplexing An...

Multiplexing  and De multiplexing Another  critical set of services that are provided by the transport layer is that of application multiplexing and de multiplexing. This featu

Routing and routed protocols, What is difference among routing and routed p...

What is difference among routing and routed protocols? Ans) i) Routing use for top path selection ii) Routed protocol carries on source and destination information.

Describe the term disaster management as security threats, Describe the ter...

Describe the term Disaster Management as security threats Making and testing backups regularly could be the simplest and easiest of all the security measures. But a new questio

Advantage of ip sec tunnelling mode, Advantage of IP sec  Tunnelling Mode ...

Advantage of IP sec  Tunnelling Mode IP Sec  tunnelling mode  has the  following  advantages: a.Security : Ts IP sec tunnelling mode  secure somewhat but  not the best. In a

Digital encoding scheme, what are the applications of different encoding sc...

what are the applications of different encoding schemes

Cnet sliding window protocol, implementing cnet sliding window protocol wit...

implementing cnet sliding window protocol with 6 nodes

Show the flow characteristics, Q. Show the Flow characteristics? Flow ...

Q. Show the Flow characteristics? Flow characteristics Reliability - if lacking means that packets or ACKs are lost - more important with FTP, SMTP than with audio

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