Message passing in pvm, Computer Networking

Message Passing

The PVM communication model gives asynchronous blocking receive, asynchronous blocking send and nonblocking receive functions. In our methodology, a blocking send returns as early as the send buffer is free for use again, and an asynchronous send does not depend on the receiver calling a matching receive before the send can return. There are options in PVM 3 that request that data be transmitted directly from task to task. In this case, if the message is big, the sender may block until the receiver has called a matching receive.

A nonblocking receive instantaneously returns with both the data and a flag that the data has not arrived, whereas a blocking receive returns only when the data is in the receive buffer. In adding to these point-to-point communication functions, the model supports the multicast to a place of tasks and the broadcast to a user-defined group of tasks. There are also functions to present global max, global sum, etc. across a user-defined set of tasks. Wildcards can be specified in the receive for the label and the source, allowing either or both of these contexts to be ignored. A routine can be called to return the information about the received messages.

The PVM model assuring that the message order is conserved. If task 1 sends message A to task 2, then after task 1 sends message B to task 2, message A will arrive at task 2 earlier than message B. Furthermore, if both the messages arrive earlier than task 2 does a receive, then a wildcard receive will the entire time return message A.

  • int bufid = pvm_mkbuf( int encoding )

Generates a new message buffer. encoding states the buffer's encoding scheme.

Posted Date: 3/2/2013 7:23:29 AM | Location : United States







Related Discussions:- Message passing in pvm, Assignment Help, Ask Question on Message passing in pvm, Get Answer, Expert's Help, Message passing in pvm Discussions

Write discussion on Message passing in pvm
Your posts are moderated
Related Questions
Middleware is distributed software required to support interaction among clients and servers. In short, it is the software that is in the middle of the Client/Server systems and it

Q. Show the Distribution of Name Space? Distribution of Name Space --Information for domain name space must be stored on multiple servers (DNS servers) to be efficient

Q. What do you mean by Addressing? Addressing Require to uniquely and universally identify every device to allow global communication Internet address or IP address is us

AILURES AND BATHTUB CURVE The life of a component system can be grouped into three different phases typical curve depicting these three is called the bathtub curve due to its s


What is a TP Monitor? There is no commonly accepted explanation for a TP monitor. According to Jeri Edwards' a TP Monitor is "an OS for transaction processing".

What is routing region? When hierarchical routing is used, the routers are separated into what we call regions, with each router knowing all the details about how to route pack

Explain about the Integrating Intranet These Intranets are designed to replace the complexity of in-house communications and processing systems that large organisations ofte


What is Proxy ARP? Is using a router to give answer ARP requests. This will be completed when the originating host believes that a destination is local, when in fact is lies be