Distributed Memory Programming & MPI

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Questions and Answers

What is PVM primarily used for?

  • Writing application programs
  • Distributed operating system
  • Heterogeneous distributed computing (correct)
  • Message passing

What type of messages does PVM support?

  • Standard messages
  • Heterogeneous messages
  • Rich messages
  • Simple messages (correct)

What is a characteristic of PVM?

  • It holds control over process and resources
  • It is a library for writing application programs (correct)
  • It is a programming language
  • It is a distributed operating system

How does PVM handle faults?

<p>It has a strong fault tolerance (B)</p> Signup and view all the answers

What is a characteristic of MPI?

<p>It is portable over flexibility (A)</p> Signup and view all the answers

What type of communication topology does PVM use?

<p>No topology is used (A)</p> Signup and view all the answers

What is MPI primarily used for?

<p>Message passing (A)</p> Signup and view all the answers

How does MPI handle heterogeneity?

<p>In terms of communication of applications (B)</p> Signup and view all the answers

What is a characteristic of MPI?

<p>It is a static model (B)</p> Signup and view all the answers

What is a key difference between PVM and MPI?

<p>PVM is a library, while MPI is a distributed operating system (D)</p> Signup and view all the answers

Flashcards

What is PVM used for?

PVM is a library used primarily for heterogeneous distributed computing, which involves connecting computers with different architectures and operating systems to work together.

What type of messages does PVM support?

PVM supports simple messages, meaning that data exchanged between computers is transmitted without complex formatting or special protocols.

What is a characteristic of PVM?

PVM is a library, which is a collection of pre-written code that helps developers create applications for distributed systems.

How does PVM handle faults?

PVM is designed to handle faults, meaning it can continue working even if some computers in the network fail.

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What is a characteristic of MPI?

MPI is portable over flexibility, suggesting its ability to run on different types of computers and systems without major changes.

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What is MPI primarily used for?

MPI is a message-passing interface, a standard for communication between computers in a distributed system.

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How does MPI handle heterogeneity?

MPI handles heterogeneity by focusing on communication of applications, allowing computers with different architectures to exchange data effectively.

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What is a characteristic of MPI?

MPI is a static model, meaning the way computers are connected and how they communicate is predetermined before the program runs.

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What is a key difference between PVM and MPI?

MPI is a distributed operating system, which means it controls the resources and communication within a network of computers.

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What type of communication topology does PVM use?

PVM uses a network topology where the communication pattern is not fixed, allowing for flexible connections between computers.

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Study Notes

Distributed Memory Programming

  • Distributed memory programming is necessary when two or more computational processes do not share memory.
  • Processes must exchange data using a different mechanism, such as message passing.
  • Interface standards like Message-Passing Interface (MPI) facilitate distributed memory programming for cluster machines.

Message Passing

  • In a message-passing model, parallel processes exchange data by passing messages to each other.
  • Communications can be asynchronous or synchronous.
  • Message passing model allows multiple processes to read and write data to the message queue without being connected to each other.

Message Passing Interface (MPI)

  • MPI is a type of message passing library standard.
  • It is used for explicit parallel programming on distributed memory systems.
  • It supports programming languages like C, C++, FORTRAN, and JAVA.
  • MPI is useful on distributed memory machines and supports communication modes such as standards, synchronous, buffered, and ready.

MPI Send and Receive

  • Send and receive are the basic operations in the message-passing programming paradigm.
  • Send operation: send(void *sendbuf, int nelements, int dest)
  • Receive operation: receive(void *recvbuf, int nelements, int source)

Parallel Virtual Machine (PVM)

  • PVM is a software package that allows a heterogeneous collection of computers to be used as a single large parallel computer.
  • It enables users to solve larger computational problems at minimal additional cost.
  • PVM is widely used in scientific, industrial, and medical applications, and as an educational tool.

PVM vs MPI

  • PVM is a standard for heterogeneous distributed computing, while MPI is a standard for message passing.
  • PVM supports heterogeneity in machines, networks, and applications, while MPI supports heterogeneity in communication.
  • PVM is a distributed operating system, while MPI is a library for writing application programs.

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