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

TRAFFIC CONGESTION ASSESSMENT, Can I get help for traffic congestion anlysi...

Can I get help for traffic congestion anlysis using GIS

Sonet sdh , SONET SDH To satisfy the  requirements  of ever inc...

SONET SDH To satisfy the  requirements  of ever increasing data rate  for diverse applications, ANS developed  a standard known as synchronous optical  network by utili

Building distributed systems, Unfortunately, building real-life distributed...

Unfortunately, building real-life distributed systems is not easy. It is hard, for instance, to implement instructions such as "send this data structure to be processed on that com

Maintaining the sequence number, Maintaining the sequence number The  ...

Maintaining the sequence number The  other advantage of GBN  is that  it maintain  the next  sequence number.

Define IEEE 802.4-token bus, IEEE 802.4-Token bus Physical line or tree...

IEEE 802.4-Token bus Physical line or tree however logical ring. Stations know "left" as well as "right" stations. One token "passed" from station to station. Only station with

Explain what is meant by circuit switching, Question 1: (a) Explain wh...

Question 1: (a) Explain what is meant by circuit switching? Give its main shortcoming and explain its relevance in telephone systems. (b) Outline the differences betwee

Wide area network wan- fundanentals of networks, Wide Area Network WAN ...

Wide Area Network WAN Wide  Area Network  ( WANs) connect larger geographic  areas such as  London the UK or the  world. In this types  of networks  dedicated transoceanic cab

What are firewalls, What are firewalls? Firewalls serve to protect an i...

What are firewalls? Firewalls serve to protect an internal network from external attacks. These external threats can be hackers who need to steal data or computer viruses that

What is a vlan, VLAN - Virtual Local Area Network Vlan is a logical grou...

VLAN - Virtual Local Area Network Vlan is a logical grouping or segmenting a network linked to administratively described ports on a switch, they give Broadcast control, Securit

What is client/server, What is client/server? Client/server is a type o...

What is client/server? Client/server is a type of network wherein one or more computers act as servers. Servers give a centralized repository of resources like printers and fil

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