In the previous lesson, I discussed how to use MPI_Send and MPI_Recv to perform standard point-to-point communication. I only covered how to send messages in which the length of the message was known beforehand. Although it is possible to send the length of the message as a separate send / recv operation, MPI natively supports dynamic messages with just a few additional function calls. I will be going over how to use these functions in this lesson. The code for this tutorial is located here.

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