<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000'>Thanks Thomas!<br><br><hr id="zwchr"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>De: </b>"Thomas Ropars" <thomas.ropars@epfl.ch><br><b>À: </b>discuss@mpich.org<br><b>Envoyé: </b>Vendredi 20 Septembre 2013 09:57:27<br><b>Objet: </b>Re: [mpich-discuss] Order of completion in MPI_Waitany<br><br>
<div class="moz-cite-prefix">Hi Matthieu,<br>
<br>
MPI does not provide any guarantee on the completion order of the
reception requests in this case. More generally, regarding
waitAny, the MPI-3.0 specification says that "If more than one
operation is enabled and can terminate, one is arbitrarily
<br>
chosen".<br>
<br>
Thomas<br>
<br>
On 09/19/2013 04:31 PM, Matthieu Dorier wrote:<br>
</div>
<blockquote cite="mid:1471507564.2704225.1379601073317.JavaMail.root@irisa.fr">
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<div style="font-family: times new roman,new york,times,serif;
font-size: 12pt; color: #000000">Hi,
<div><br>
</div>
<div>I would like a precision on the semantics of MPI_Waitany in
this situation:</div>
<div><br>
</div>
<div>- Process 1 does 2 MPI_Irecv with different tags A and B
(the order doesn't matter); it then waits on the two requests
with MPI_Waitany.</div>
<div>- In the mean time, process 2 does an MPI_Send with tag A,
then MPI_Send with tag B.</div>
<div>Can I ensure that MPI_Waitany will always give me the index
of the message corresponding to the first MPI_Send, i.e. the
one with the tag A, even in situations where process 1 called
MPI_Irecv on a tag B first?</div>
<div><br>
</div>
<div>Thanks</div>
<div><br>
<div><span></span><font size="2"><font size="3">Matthieu
Dorier<br>
</font>PhD student at ENS Cachan Brittany and IRISA<br>
<a href="http://people.irisa.fr/Matthieu.Dorier" target="_blank">http://people.irisa.fr/Matthieu.Dorier</a></font><span></span><br>
</div>
</div>
</div>
<br>
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