Right. I thought you were asking about receiving *another* message from whomever you just received from via ANY_SOURCE.
If you want to receive from a specific sender, you just specify the rank you want to receive from -- not ANY_SOURCE. You will always only receive messages that were sent to *you*. There's no MPI_SEND_TO_ANYONE_WHO_IS_LISTENING functionality, for example. So your last statement: "But when it captures with .. MPI_ANY_SOURCE and MPI_ANY_TAG, the receiver will capture any message (even not targetted for it)" is incorrect. I guess I still don't understand your question...? On Jul 14, 2011, at 9:17 PM, Mudassar Majeed wrote: > > I know this, but when I compare status.MPI_SOURCE with myid, they are > different. I guess you need to reconsider my question. The MPI_Recv function > seems to capture message from the queue with some search parameters like > source, tag etc. So in case the receiver does not know the sender and wants > to receive only that message which was sent for this receiver. But when it > captures with source as MPI_ANY_SOURCE and MPI_ANY_TAG, the receiver will > capture any message (even not targetted for it). > > regards, > Mudassar > > > From: Jeff Squyres <jsquy...@cisco.com> > To: Mudassar Majeed <mudassar...@yahoo.com>; Open MPI Users > <us...@open-mpi.org> > Sent: Friday, July 15, 2011 1:58 AM > Subject: Re: [OMPI users] Urgent Question regarding, MPI_ANY_SOURCE. > > When you use MPI_ANY_SOURCE in a receive, the rank of the actual sender is > passed back to you in the status.MPI_SOURCE. > > On Jul 14, 2011, at 7:55 PM, Mudassar Majeed wrote: > > > Hello people, > > I am trapped in the following problem plz help me. > > Suppose a process A sends a message to process B. The process B will > > receive the message with MPI_Recv with MPI_ANY_SOURCE in the source > > argument. Let say process B does not know that A is the sender. But I want > > B to receive message from process A (the one who actually sends the message > > to process B). But if I use MPI_ANY_SOURCE, then any message from any > > source is captured by process B (let say there are other processes sending > > messages). Instead of MPI_ANY_SOURCE I cannot use A in the source argument > > as B does not know about the sender. What should I do in this situation ? > > > > regards, > > Mudassar Majeed > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > -- > Jeff Squyres > jsquy...@cisco.com > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > > -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
