Use MPI_Iprobe. It's a nonblocking probe that allow you to see if a message is coming. So in your receiver code you just periodically probe to see if messages are coming your way.
On Sun, Jun 27, 2010 at 9:11 PM, Jack Bryan <dtustud...@hotmail.com> wrote: > thanks > > I know that. > > MPI_irecv() ; > > do other works; > > MPI_wait(); > > But, my message receiver is much slower than sender. > > when the sender is doing its local works, the sender has sent out their > messages. but at this time, > the sender is very busy doing its local work and cannot post MPI_irecv to > get the messages from > senders. > > Any help is appreciated. > > jack > > > > ------------------------------ > From: jiangzuo...@gmail.com > Date: Mon, 28 Jun 2010 11:55:32 +0800 > > To: us...@open-mpi.org > Subject: Re: [OMPI users] openMPI asychronous communication > > 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. > > Changsheng Jiang > > > On Mon, Jun 28, 2010 at 11:41, Jack Bryan <dtustud...@hotmail.com> wrote: > > thanks > > I know this. > > but, what if sender can send a lot of messages to receivers faster than > what receiver can receive ? > > it means that sender works faster than receiver. > > Any help is appreciated. > > jack > > > ------------------------------ > From: jiangzuo...@gmail.com > Date: Mon, 28 Jun 2010 11:31:16 +0800 > To: us...@open-mpi.org > Subject: Re: [OMPI users] openMPI asychronous communication > > > MPI_Isend - Starts a standard-mode, nonblocking send. > > BTW, are there any asynchronous collective operations? > > Changsheng Jiang > > > On Mon, Jun 28, 2010 at 11:22, Jack Bryan <dtustud...@hotmail.com> wrote: > > Dear All: > > How to do asychronous communication among nodes by openMPI or boot.MPI in > cluster ? > > I need to set up a kind of asychronous communication protocol such that > message senders and receivers can communicate asychronously without losing > any > messages between them. > > I do not want to use blocking MPI routines because the processors can do > other > operations when they wait for new messages coming. > > I donot find this kind of MPI routines that support this > asychronous communication. > > Any help is appreciated. > > thanks > > Jack > > June 27 2010 > > ------------------------------ > The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with > Hotmail. Get > busy.<http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5> > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > > ------------------------------ > The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with > Hotmail. Get > busy.<http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5> > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > > ------------------------------ > The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with > Hotmail. Get > busy.<http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5> > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > -- David Zhang University of California, San Diego
