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 net stat, What is net stat? Netstat is a command line utility p...

What is net stat? Netstat is a command line utility program. It gives useful information about the current TCP/IP settings of a connection.

What does ''p'' mean when running a trace, When a P is returned when a Trac...

When a P is returned when a Trace is run, it means the Protocol is unreachable.

Explain point-to-point connection type, Explain Point-to-Point connection t...

Explain Point-to-Point connection type. Many point-to-point connections are associated with modems and PSTN (Public Switched Telephone Network) communications.

Distributed route computation, In distributed routing computation, every pa...

In distributed routing computation, every packet switch calculates its routing table locally and transmit messages to the neighbors. It also updates information regularly. If a pac

Explain control frame of claim token, Control Frame: claim_token Co...

Control Frame: claim_token Consider first station turned on Station notices no tokens Sends claim_token No competitors, so makes a ring of just itself P

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 crc and checksum, What is CRC and Checksum CRC (Cyclic redudan...

What is CRC and Checksum CRC (Cyclic redudancy check) CRC, is the most powerful of the redundancy checking methods, is based on binary division. Checksum Checksum

Determine the window positions for succession of events, Two neighbouring n...

Two neighbouring nodes (A and B) use a Go-Back-N protocol with a 3-bit sequence number and a window size of 4. Acknowledgments are cumulative. Assuming A is transmitting and B is r

Explain data communications, The distance over which data moves within a co...

The distance over which data moves within a computer may differ from a few thousandths of an inch, as is the case within a one IC chip, to as much as lot of feet along the backplan

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