OK, then i think you also know using MPI_Wait to wait the asynchronous requests to complete. if sender works faster then receiver(or reverse), then the MPI_Wait will do wait, not just deallocted. you should keep the buffer content before MPI_Wait.<br>

<br clear="all">                                                      Changsheng Jiang<br>
<br><br><div class="gmail_quote">On Mon, Jun 28, 2010 at 11:41, Jack Bryan <span dir="ltr">&lt;<a href="mailto:dtustudy68@hotmail.com">dtustudy68@hotmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">





<div>
thanks<div><br></div><div>I know this. </div><div><br></div><div>but, what if sender can send a lot of messages to receivers faster than what receiver can receive ? </div><div><br></div><div>it means that sender works faster than receiver. </div>

<div><br></div><div>Any help is appreciated. </div><div><br></div><div>jack </div><div><br><br><hr>From: <a href="mailto:jiangzuoyan@gmail.com" target="_blank">jiangzuoyan@gmail.com</a><br>Date: Mon, 28 Jun 2010 11:31:16 +0800<br>

To: <a href="mailto:users@open-mpi.org" target="_blank">users@open-mpi.org</a><br>Subject: Re: [OMPI users] openMPI asychronous communication<div class="im"><br><br>MPI_Isend - Starts a standard-mode, nonblocking send.<br>

<br>BTW, are there any asynchronous collective operations?<br><br clear="all">                                                      Changsheng Jiang<br>
<br><br><div>On Mon, Jun 28, 2010 at 11:22, Jack Bryan <span dir="ltr">&lt;<a href="mailto:dtustudy68@hotmail.com" target="_blank">dtustudy68@hotmail.com</a>&gt;</span> wrote:<br><blockquote style="padding-left: 1ex;">





<div>
<div>Dear All:</div><div><br></div><div>How to do asychronous communication among nodes by <span style="font-size: 13.3333px;">openMPI or </span><span style="font-size: 13.3333px;">boot.MPI  in cluster ?</span></div><div>



<br></div><div>I need to set up a kind of asychronous communication protocol such that </div><div>message senders and receivers can communicate asychronously without losing any</div><div>messages between them. </div><div>



<br></div><div>I do not want to use blocking MPI routines because the processors can do other</div><div>operations when they wait for new messages coming.</div><div><br></div><div>I donot find this kind of MPI routines that support this </div>



<div>asychronous communication. </div><div><br></div><div>Any help is appreciated. </div><div><br></div><div>thanks</div><div><br></div><div>Jack </div><div><br></div><div>June 27  2010</div> 		 	   		  <br><div>

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