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Q. Functions for various communication modes?
MPI offers both non-blocking and blocking send/transmitting and receive operations for all modes.
Functions for various communication modes:
MPI_Irecv and MPI_Recv are nonblocking and blocking functions for receiving messages regardless of mode.
Besides receive and send functions MPI offers a number of more useful functions for communications. A number of them are being introduced here.
MPI_Buffer_attach used to offer buffer space for buffered mode. Nonblocking functions comprise request argument used subsequently to conclude whether requested operation has finished.
MPI_Wait and MPI_Test test or wait for completion of nonblocking communication.
MPI_Probe and MPI_Iprobe search for incoming message without really receiving it. Information regarding message concluded by probing can be used to determine how to receive it.
MPI_Cancel withdraws outstanding message request useful for cleanup at end of a program or after major stage of computation.
Performance Bottlenecks can be identified by using monitors. These monitors might be application server monitors, database server monitors, web server monitors and network monitors
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