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

Explain parallel computer architecture, Parallel Computer Architecture ...

Parallel Computer Architecture The two key parametric concerns in designing parallel computer architecture are: 1) executing many numbers of instructions concurrently, and

What is proxy serer and firewall, What is Proxy Sever and Firewall Pro...

What is Proxy Sever and Firewall Proxy Sever Also known as a proxy or application level gateway. It is an application that breaks the connection among sender and receiver.

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.

State the nonselective fading and selective fading, Nonselective fading and...

Nonselective fading and Selective fading Nonselective fading, is a fading in which all frequency methods of the received signal fluctuate in the similar proportions simultaneo

Define interconnection network, Interconnection Network An interconnect...

Interconnection Network An interconnection network is designed for transferring data between two processors in a Multi-stage network. Memory bottleneck is a fundamental limitat

Briefly describe how the file system is organized in unix, Question: a)...

Question: a) Briefly describe how the file system is organized in Unix. b) What is the importance of the "touch" command. Give one of its disadvantage. c) Name three d

Show the refraction and reflection in Fiber-optic cable , Q. Show the Refra...

Q. Show the Refraction and Reflection in Fiber-optic cable ? - Refraction often takes place when light bends as it passes from one medium to another less dense medium - Wh

What are triggers and rules, What are Triggers and Rules? Triggers are...

What are Triggers and Rules? Triggers are special user defined actions generally in the form of stored processes that are automatically invoked by the server based on data rel

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