Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Amdahl Law to measure speed up performance?
Remember that speed up factor assists us in knowing relative gain attained in shifting execution of a task from sequential computer to parallel computer and performance doesn't increase linearly with rise in number of processors. Because of above reason of saturation in 1967 Amdahl's law was derived. Amdahl's law defines that a program includes 2 types of operations that is complete sequential operations that should be done serially and complete parallel operations that can be executed on numerous processors. The declaration of Amdahl's law can be illustrated with help of following example.
Let's discuss a problem say P that has to be solved with the help of parallel computer. In accordance with Amdahl's law there are principally two types of operations. So the problem would have a number of serial operations and a number of parallel operations. We already know that this requires T (1) amount of time to carry out a problem using a sequential machine and sequential algorithm. The time to calculate sequential operation is a fraction α (alpha) (α ≤ 1) of total execution time that is T (1) and time to calculate parallel operations is (1- α). So S (N) can be calculated as below:
Dividing by T(1)
Consider the value of α is amid 0 and 1. Now let's put a number of values of α and calculate speed up factor for rising values of number of processors. We find that S(N) continue reduces with increase in value of α (which is number of serial operations as displayed in Figure below).
Figure: Speed-up vs. Number of Processors
The graph in Figure clearly demonstrates that there is a bottleneck caused because of serial operations in parallel computer. Even when numbers of serial operations are more after rising number of processors speed up factor S (N) degrades.
The sequential fraction which is α can be compared with speed up factor S (N) for a permanent value of N let's say 500. Figure below demonstrates a pictorial view of effect of Amdahl's law on speed up factor.
Figure: (n) vs. α (Graph is not to scale)
Determine the benefits of Message passing Message passing provides two major benefits: An object's properties are expressed by its methods, thus message passing support
In general what are the two ways in which one can retrieve data from tables? Using Select statements, Database Program.
Handling Multiple Devices Interrupt Priority Continue to accept interrupt requests from higher priority components Disable interrupts from component at the sa
SOLVE PUSH+DOOR=BELL AND GIVE+THEM=HELP
Explain about the Voice recognition system These voice recognition systems recognise spoken words e.g. for disabled people who can't use keyboards where they speak commands rat
What is structural hazard? Structural hazard is the situation when two instructions needs the use of a given hardware resource at the similar time. The most common case in whic
A device which converts BCD to Seven Segment is called ? Ans. DECODER is a device that converts BCD to Seven Segment. This coverts binary words in alphanumeric characters.
Define baud rate The rate of data transfer in serial data communication is signified in bps. Bits per second (bps) is the rate of transfer of information bits. Baud is the num
Q. What do you mean by Internet? Ans: Internet is a network of networks or collection of networks. Several networks such as WAN and LAN connected through suitable hardware an
A subroutine can be terminated unconditionally using EXIT. True.
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd