<div>Hi Aron </div> <div>thanks for your comments. </div> <div>I found the MPI_IALLREDUCE (<A href="http://publib.boulder.ibm.com/infocenter/clresctr/vxrx/index.jsp?topic=/com.ibm.cluster.pe.doc/pe_linux42/am107l0016.html">http://publib.boulder.ibm.com/infocenter/clresctr/vxrx/index.jsp?topic=/com.ibm.cluster.pe.doc/pe_linux42/am107l0016.html</A> )</div> <div>but it seems it is the mpi implementation by IBM. it would be great to have the same thing in mpich.</div> <div> </div> <div><BR><BR><B><I>Aron Ahmadia <aja2111@columbia.edu></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">The term you are looking for is non-blocking, a non-collective reduce<BR>is almost an oxymoron.<BR><BR>And no, non-blocking reduces are not anywhere in the MPI Standard,<BR>maybe one of these days.<BR><BR>Your best bet is to write an implementation yourself using MPI_ISEND<BR>and a tree structure
which takes advantage of your network topology.<BR><BR>This isn't exactly a question for PETSc though, you might have better<BR>luck on the mpich-users mailing list. You could also look in the<BR>literature to see how people are implementing global asynchronous<BR>codes cleverly. Let me know what you find (feel free to respond to<BR>aja2111@columbia.edu), I'm interested in this sort of work as well.<BR><BR>~A<BR><BR>On 7/10/07, Mehdi Bostandoost <MBOSTANDOUST@YAHOO.COM>wrote:<BR>> Hi<BR>> I am working on optimizing my code. one of the functions that I used in my<BR>> code is MPI_ALLREDUCE. I want to have overlap between this communcation and<BR>> my computation part of my code. is there any way to work around it?<BR>> (it would be great to have sth like MPI_IALLREDUCE,MPI_WAIT)<BR>><BR>> Mehdi<BR>><BR>><BR>><BR>> ________________________________<BR>> Get the Yahoo! toolbar and be alerted to new email wherever you're
surfing.<BR>><BR>><BR><BR></BLOCKQUOTE><BR><p> 
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