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</p> Signup and view all the answers

    What is a characteristic of MPI?

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

    What type of communication topology does PVM use?

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

    What is MPI primarily used for?

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

    How does MPI handle heterogeneity?

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

    What is a characteristic of MPI?

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

    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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    Description

    Learn about distributed memory programming and the concepts of message passing, MPI, and PVM. Understand how processes communicate with each other without shared memory.

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