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Questions and Answers
What is PVM primarily used for?
What type of messages does PVM support?
What is a characteristic of PVM?
How does PVM handle faults?
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What is a characteristic of MPI?
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What type of communication topology does PVM use?
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What is MPI primarily used for?
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How does MPI handle heterogeneity?
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What is a characteristic of MPI?
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What is a key difference between PVM and MPI?
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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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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.
