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. Speed Up - metrics for performance evaluation?
Speed up is ratio of time needed to execute a given program employing a specific algorithm on a machine with single processor (It implies that T (1) (where n=1)) to time needed to execute same program using a particular algorithm on a machine with multiple processors (It implies that T (n)). Fundamentally speed up factor helps us in knowing relative gain achieved in shifting from a sequential machine to a parallel computer. It can be noted the term T(1) denotes amount of time taken to execute a program employing the best sequential algorithm It implies that the algorithm with least time complexity.
Let's take an illustration and explain practical use of speedup. Suppose we have a problem of multiplying n numbers. Time complexity of sequential algorithm for a machine with single processor is O(n) because we require one loop for reading and computing output. But in the parallel computer let every number is assigned to specific processor and computation model being used being a hypercube. In such a condition the total number of steps essential to compute result is log n it implies that time complexity is O(log n). Figure below explains the steps to be followed for achieving the required output in a parallel hypercube computer model.
As number of steps followed is equivalent to 3 it implies that log 8 where n is number of processors. Therefore complexity is O(log n).
In view of fact sequential algorithm takes 8 steps whereas above mentioned parallel algorithm takes 3 steps speed up is as under:
Because value of S(n) is inversely proportional to time needed to calculate output on a parallel number that in turn is dependent on number of processors used for performing the computation. The relation amid S(n) versus Number of processors is displayed in Figure. The speedup is directly proportional to number of processors so a linear arc is portrayed. But in situations where there is parallel overhead the arc is sub-linear.
Figure: Steps followed for multiplying n numbers stored on n processors
Figure: Speed-up vs. Number of Processors
What is a compiler? A Compiler is a program that accepts a program written in a high level language and creates an object program.
Why Build and fix model is considered as ad-hoc software development model?
Reprography In order to disseminate information widely some method of reprography is invariably used. Reprography is the science and practice of copying documents by photograph
Display how the value ASCII "MIRIAM" is stored in memory in Big Endian format starting at location 100 hexadecimal. Suppose that each memory location kept two ASCII characters.
What format should my database be saved in to allow different versions of Microsoft Access to open the database? Ans) MS Access is not backwards compatible. To share tables amon
State The Benefits of Encapsulation To hide the details of a class, you can declare that data or implementation in the private part of class so that other class clients will n
Describe the purpose and operation of Register 2 (R2) for the MSP430
TARGET = "_parent" "_parent" is used in a situation where a frameset file is nested inside another frameset file. A link in one of the inner frameset documents that uses "_par
Advantage of wrapping database calls into MTS transaction If database calls are complete within the context of a transaction, aborting the transaction will undo and changes that
a. What are the activities included during the process of developing a formal specification of a sub-system interface? b. Explain the Pair Programming? What are the benefits of
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