The difference is that MPI_Barrier or even MPI_Ibarrier is a crude tool
for the job. It is likely to leave resources idle that could be doing
productive work.
I agree it is part of the tool kit but if this kind of problem is
significant enough so a textbook should cover it then I would advocate
Richard Treumann wrote:
Hi Ashley
I understand the problem with
descriptor
flooding can be serious in an application with unidirectional data
dependancy.
Perhaps we have a different perception of how common that is.
Ashley speculated it was a "significant minority." I don't know
Hi Ashley
I understand the problem with descriptor flooding can be serious in an
application with unidirectional data dependancy. Perhaps we have a
different perception of how common that is.
It seems to me that such programs would be very rare but if they are more
common than I imagine, then
