Point-to-point communications - conclusion

P2P Conclusion

That's it ! We are finished with point-to-point communications ! By now you should know all the basics to send and receive messages from one specific process to another specific process. With that, you can already do a lot of different funky things in parallel !

In the next chapter, we will talk about collective communications, when you want to reach more than just one process in a communication. In the meantime, you can practice what you have learnt by answering this quizz :

What is the default communicator that encapsulate all processes ?

MPI_COMM_ALL

MPI_COMM_DEFAULT

MPI_COMM_WORLD

MPI_COMM_DEF

Which of these situations is/are a race condition ?

When the send buffer is not filled fast enough for the receive to be completed properly.

When there is a large difference in sending time between two processes with the same buffers.

When the sending process modifies its buffer before the receiving process has read from it.

What is a deadlock ?

When a process blocks its buffer so that no receive can modify it

A mode of communication, that waits for a receive to be completed before sending

When multiple processes are waiting for each-other without being able to continue

When a non-blocking receive is not followed by a wait.

What are the four modes of communication ?

Standard, buffered, ready and synchronous.

Standard, buffered, deadlocked and synchronous.

Default, standard, buffered and ready

Default, standard, buffered and synchronous.

The buffered mode is fundamentally similar to a non-blocking send

True

False

What can we use probing for ?

To know if a message is waiting to be delivered to a process

To know the tag of an incoming message

To know the id of the process sending a message

To know the number of elements in an incoming message

In non-blocking communications, which function must necessarily be called at some point after a receive or a send ?

MPI_Test

MPI_Barrier

MPI_Wait

MPI_Probe

What command should be used to synchronise all the processes on a communicator ?

MPI_Wait

MPI_Sync

MPI_Barrier

MPI_Synchronize

Introduction to MPI

Open Source Your Knowledge, Become a Contributor

P2P Conclusion

Open Source Your Knowledge, Become a Contributor

13/30 Point-to-point communications - conclusion

P2P Conclusion

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