Have a read of this blog entry and see if it helps:
On Jan 24, 2012, at 7:35 PM, Mateus Augusto wrote:
> I would like to know if the MPI is a FIFO (first in first out) channel, ie, if the A message is sent before of the B message, then, MPI garantees that A will be received before B in the recipient.
> Does the MPI guarantee that A always will be received first?
> Or may B be received first sometimes?
> Assume that A and B are sent in different calls to send messages (for example MPI_Send).
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