MPI_Send(97).: Invalid rank has value 13 but must be nonnegative and less than 0

Question

MPI_Send(171): MPI_Send(buf=0x7ffd6f5e7ccc, count=1, MPI_INT, dest=13, tag=0, MPI_COMM_WORLD) failed
MPI_Send(97).: Invalid rank has value 13 but must be nonnegative and less than 0

What could be causing this? I have no idea how the rank could be nonnegative and less than 0.

You are probably missing a call to MPI_Init somewhere. After proper initialisation, MPI_COMM_WORLD simply cannot contain less than one rank. — Hristo Iliev

Donghui Zhang Donghui Zhang · Accepted Answer · 2016-10-28T22:17:36

From the error message "invalid rank...must be...less than 0", it is apparent that you MPI world has 0 process in it. Check how you started the MPI processes, and make sure you've called MPI_Init in all processes with the correct process count.

MPI_Send(97).: Invalid rank has value 13 but must be nonnegative and less than 0

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