<div dir="ltr">Is it allowed to communicate messages with (buffer=NULL,count=0,type=MPI_DATATYPE_NULL)?<div><br></div><div>George thinks MPI_DATATYPE_NULL cannot be used even when count=0, which I think is ridiculous, particularly when one makes the analogy to buffer=NULL.</div><div><br></div><div>See <a href="http://www.open-mpi.org/community/lists/users/2016/01/28255.php">http://www.open-mpi.org/community/lists/users/2016/01/28255.php</a> for the thread in question.</div><div><br></div><div>There is example code in MPI that uses this behavior. George and I agree that example text is non-normative, but I cannot imagine how this example came to exist without the Forum believing it to be valid.</div><div><br>Jeff<br clear="all"><div><br></div>-- <br><div class="gmail_signature">Jeff Hammond<br><a href="mailto:jeff.science@gmail.com" target="_blank">jeff.science@gmail.com</a><br><a href="http://jeffhammond.github.io/" target="_blank">http://jeffhammond.github.io/</a></div>
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