Scripted HTML version of Foils prepared 11 November 1996
Foil 20 Basic Point to Point Message Passing II
From CPS615-Initial Lecture on MPI ending with discussion of basic MPI_SEND Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 31 October 96. byGeoffrey C. Fox * Secs 685.4
Two types of communication operations applicable to send and receive
Blocking -- sender and receiver wait until communication is complete
Non-blocking -- send and receive handled concurrently with computation -- MPI send and receive routines return immediately before message processed so processor can do other things
In addition four types of send operation
Standard -- A send may be initiated even if matching receive has not been initiated
Synchronous -- Waits for recipent to complete and so message delivery guaranteed
Buffered -- Copies message into a buffer (if necessary) on destination processor so that completion of send independent of matching receive
Ready -- A send is only started when matching receive initiated
Secs 685.4
