Merits of message passage-shared memory, Computer Networking

Assignment Help:
  • Gives excellent low-level control of parallelism;
  • Portable;
  • Minimal overhead in data distribution and parallel synchronisation; and
  • It is less error prone.

Drawbacks

Message-passing code generally needs more software overhead than parallel shared-memory code.

Shared Memory

In shared memory approach, more focus is on the control parallelism in its place of data parallelism. In this model, many processes run independently on different processors, but they share a common address space accessible to all as shown in Figure.

1238_Shared memory.png

                                                                              Shared memory

The processors communicate with one another by one processor reading data into a location in memory and another processor writing the data. Any modification in a memory location effected by one processor is visible to all other processors. As shared data can be accessed by more than one process at the similar time, some control mechanism such as semaphores / locks should be devised to make sure mutual exclusion. This model is often referred to as SMP (Symmetric Multi Processors), named so because a common symmetric implementation is used for several processors of the similar type to access the same shared memory.  A number of multi-processor systems executes a shared-memory programming model; examples includes: SGI Power Onyx/ Origin 2000; NEC SX-5, Hewlett-Packard V2600/HyperPlex; SUN HPC 10000 400 MHz; DELL PowerEdge8450.


Related Discussions:- Merits of message passage-shared memory

Objectives of operating system for parallel computer, Objective : After...

Objective : After going through this part you will be sure to explain the features of software and operating systems for parallel computers. In particular you should be able

Determine the objectives of computer security, Determine the Objectives of ...

Determine the Objectives of computer security Though computerisation helps a lot in proper organisation of experience, it also opens a Pandora's Box simultaneously. On one

Html, Write an HTML program segment that contains hypertext links from one ...

Write an HTML program segment that contains hypertext links from one document to another.

Retransmission of packets - transport layer, Retransmission of packets ...

Retransmission of packets The disadvantage  of thronging away a correctly received packet is that  the subsequent retransmission  of the  packet might  be lost  or garbled and

Parallel balance point, Parallel Balance Point In order to implement a ...

Parallel Balance Point In order to implement a parallel algorithm on a parallel computer, K number of processors is needed. It may be noted that the given input is assigned to

Timesharing system, advantages and disadvantages of time sharing system

advantages and disadvantages of time sharing system

What is the difference between trigger and rule, What is the difference bet...

What is the difference between trigger and rule? The triggers are known as implicitly by database generated events, whereas stored procedures are known as explicitly by client

Introduction to operating system for parallel computer, INTRODUCTION T...

INTRODUCTION This part discusses the additional requirements at software levels and operating system which will create the parallel programs run on parallel hardware. Collecti

Simple mail transfer protocoland secure sockets layer, Simple Mail Transfer...

Simple Mail Transfer Protocoland Secure Sockets Layer SMTP: Simple Mail Transfer Protocol is a server-to-server protocol for delivering electronic mail. SSL: Secure Sockets

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