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Variable Size Message in MPI

Is there a library call that will allow sending / receiving messages with a variable size using MPI?

Working around would be to send the size of the data in the first message and follow it with the actual payload, but I was wondering if there was an agreement to combine these two separate messages.

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The account provided by MPI_Recv is only the upper bound. MPI_Get_count can be used to find the exact number of items received.

It's like sockets I think.

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MPI_Probe MPI_Iprobe MPI_Recv MPI_Irecv. Probe/Iprobe , . , , Probe/Iprobe . . Hoefler . (Mprobe), MPI-3.

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Source: https://habr.com/ru/post/1776816/

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