I guess that if the receiver want to ensure that the sender should send data only when the receiver will be able/free to receive data,
then use MPI-Barriers. On Mon, Jun 28, 2010 at 12:53 PM, David Zhang <solarbik...@gmail.com> wrote: > 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 > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
