DS notes #5

2. Communication


  1. Message passing - IPC - share information.
  2. Method
  1. Message passing Approach.
  • Sender and receiver - communicate - send and receive primitives.
  1. Shared Memory Approach - info shared memory


  1. Message passing approach
  2. Shared memory approach

  • Advantages

  • Message passing - parallel computing
  1. Hardware match
  2. Functionality - full set of functions
  3. Performance

Drawbacks


  • Programmer - data distribution scheme - resolve data dependencies - avoid deadlock and race condition.


(10 marks) Desirable features of message passing system.

  1. Uniform semantics
  • Sender and receiver local and remote process.
  1. Efficiency
  • System - no.of message exchange.
  • Optimization technique
  • Avoid setup costs and termination.
  1. Reliability
  • Guarantee - message delivery
  • Handle - lost and duplicate message.
  • Timeout mechanism.
  • Sequence number.
  1. Correctness
  • Atomicity
  • Ordered delivery.
  1. Flexibility
  2. Portability
  3. Security
  • Secure communication
  • Steps - authentication - receiver - sender
  •                                    - sender - receiver
  • encryption

DS notes #5 DS notes #5 Reviewed by akshay salve on 11:00 PM Rating: 5

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