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I came across this today
MPI_ERR_COUNT
Invalid count argument. Count arguments must be non-negative; a count of zero is often valid.
What does it mean by a count of zero is often valid? Does it mean that it is implementation dependent?
I think you’re reading too much into it. I think it means simply that depending on the user implementation, anything from 0 a random positive integer is a valid count. It’s not hard to imagine a message tag that requires no parameters.
If a message tag requires no parameters, then it is valid to send only zero (and, in fact, possibly invalid to send more than that). You have to keep in mind that no parameters is not the same thing as no data, as the message tag is a “parameter” in and of its own.