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Beginner
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Is there any performance or space overheads for using 'tag' in MPI?

Hi, 

I wonder if  there can be any performance or space overheads for using 'tag' in MPI.

It would depend on how it is implemented, but I guess if it used a sort of hash map and keep (possible) multiple buffers for the buckets. The process memory size can blow up.

Can this happen?

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Employee
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Moderator
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What tag are you talking about?  Is this related to the MPI tag used in point-to-point communications?  This is part of the standard and is required.

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