Communication modes

Communication Modes

• The mode of a point-to-point communication operation governs when a send operation is initiated, or when it completes.
• Standard mode:
  • A send may be initiated even if a matching receive has not been initiated.
• Ready mode:
  • A send may be initiated only if a matching receive has been initiated.
• Synchronous mode:
  • The same as standard mode, except the send will not complete until message delivery is guaranteed.
• Buffered mode:
  • Similar to standard mode, but completion is always independent of matching receive, and message may be buffered to ensure this.