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

Role of software in intranet, Role of Software in Intranet For an Intr...

Role of Software in Intranet For an Intranet to be successful, it must have strong software support. In this section, a brief description of the operating system, groupware an

Explain different architectures for ieee802.11, Question: (a) Explain a...

Question: (a) Explain and illustrate different architectures for IEEE802.11 (WiFi). (b) The MAC management of IEEE802.11 handles transmitter activity for power management.

Private networks, Private  Networks The information routes from one ne...

Private  Networks The information routes from one networks  to another  network through  a leased line. If an  organization needs privacy  can use a private networks  or networ

Default cdp broadcast update rate for cisco routers, What is the default CD...

What is the default CDP broadcast update rate for Cisco routers? Ans) Cisco Discovery Protocol is a proprietary protocol to permit you to access configuration information on oth

Internet architecture, Company seldom uses a single router to connect its e...

Company seldom uses a single router to connect its entire network for two purpose. Because the router must transmit every packet, the processor in a provided router is insuff

Explain routing loop issue in rip protoco, Can you determine routing loop i...

Can you determine routing loop issue in RIP protocol?

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

Calculate the efficiency of stop-and-wait ARQ, Suppose that frames are 1250...

Suppose that frames are 1250 bytes long including 25 bytes of overhead. Also assume that ACK frames are 25 bytes long. Calculate the efficiency of stop-and-wait ARQ (a) Transmits a

Local loop portion of the service starts, What is the juncture at which the...

What is the juncture at which the CPE ends and the local loop portion of the service starts?  Ans) The demarcation or demarc is the juncture at which the CPE ends and the local

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