• 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.

                                                                              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.

Posted Date: 3/2/2013 7:02:44 AM | Location : United States

Ask an Expert

Related Discussions:- Merits of message passage-shared memory, Assignment Help, Ask Question on Merits of message passage-shared memory, Get Answer, Expert's Help, Merits of message passage-shared memory Discussions

Write discussion on Merits of message passage-shared memory
Your posts are moderated

Write your message here..

Related Questions

Hyper cube, Hyper Cube A Hypercube interconnection network is increamen... Hyper Cube A Hypercube interconnection network is increament  of cube network. Hypercube interconnection network for n ≥ 3, can be distinct recursively as follow: For n = 3,

Network layer in osi model, The Network layer is used to route physical dat... The Network layer is used to route physical data to the destination point, it decides the actual path from where data travels to destination point. The network layer supports both

Network Fundamentals BTech Telecommunication, Write a report on your chosen... Write a report on your chosen topic that has been approved by your Lecturer. Your report should include appropriate figures, about 2000 words. Topics: 1 MAN- Metro Ethernet 2 Inte

Define the microcells- routing and switching, Microcells As cells becom... Microcells As cells become smaller, antennas move from the tops of tall buildings or hills, to the tops of small buildings or the sides of large buildings, and finally to lamp

Command to view the configuration-register value, Recognize the command to ... Recognize the command to view the configuration-register value Ans) show version is the command to view the configuration-register value

Concurrently read exclusively write (crew), This  is one of the models base... This  is one of the models based on PRAM. In this, the processors access the memory location parallel for reading while exclusively for writing operations. In the algorithm which u

Which protocol resolves an ip address to a mac address, The Address Resolut... The Address Resolution Protocol (ARP) sends out a broadcast to verify the MAC address from the IP address.

Data sharing - fundamentals of networks, Data Sharing One of the most ... Data Sharing One of the most important uses of networking is to allow the sharing of data. Before networking was common an accounting employee who wanted to prepare a report f

Write the definition of ipx and udp, Write the definition of IPX and UDP ... Write the definition of IPX and UDP IPX: Inter-network Packet Exchange supports the transport and network layers of the OSI network model. It provides fast, unreliable, communi

What are the advantages of the intranet, What are the Advantages of the int... What are the Advantages of the intranet The most easily noticeable difference between an Internet server and an Intranet server such as Lotus Notes is their design philosophy.