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
There are two kinds of characteristics in case of network performance. Delay Throughput

List the layers of OSI There are seven layers in OSI model a. Physical Layer b. Data Link Layer c. Network Layer d. Transport Layer e. Session Layer f. Presen

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

Q. Explain about Horn Antenna? - Outgoing transmissions broadcast by a stem and deflected outward - Received transmissions collect by a scooped part of the horn and deflecte

Explain the technique- Backpressure This technique produces an effect same to backpressure in fluids flowing down a pipe. It includes link-by-link use of flow control in a dire

What is DHCP? DHCP is short for Dynamic Host Configuration Protocol. Its major task is to automatically assign an IP address to devices across the network. It first checks for

Q. Show the Error Correction by Hamming Code? Hamming Code is able to be applied to data units of any length and uses the relationship between data and redundancy bits For i

Troubleshoot and Correct VTP and Configuration Errors When all errors are corrected, you should be capable to ping PC4 from PC1, PC5 from PC2, and PC6 from PC3. You should also

Advantages of OSPF OSPF an is having different  advantages. These are as follows. OSPF  is an open standard supported by many  vendors. OSPF converges quickly. OSPF au