Hi Jody, thanks four your quick reply. But what's the difference? 2009/2/5 jody <jody....@gmail.com>: > Hi Gabriele > > Shouldn't you reverse the order of your send and recv from > MPI_Irecv(buffer_recv, bufferLen, MPI_INT, recv_to, tag, > MPI_COMM_WORLD, &request); > MPI_Send(buffer_send, bufferLen, MPI_INT, send_to, tag, MPI_COMM_WORLD); > > to > > MPI_Send(buffer_send, bufferLen, MPI_INT, send_to, tag, MPI_COMM_WORLD); > MPI_Irecv(buffer_recv, bufferLen, MPI_INT, recv_to, tag, > MPI_COMM_WORLD, &request); > > ? > Jody > > On Thu, Feb 5, 2009 at 11:37 AM, Gabriele Fatigati <g.fatig...@cineca.it> > wrote: >> Dear OpenMPI developer, >> i have found a very strange behaviour of MPI_Test. I'm using OpenMPI >> 1.2 over Infiniband interconnection net. >> >> I've tried to implement net check with a series of MPI_Irecv and >> MPI_Send beetwen processors, testing with MPI_Wait the end of Irecv. >> For strange reasons, i've noted that, when i launch the test in one >> node, it works well. If i launch over 2 or more procs over different >> nodes, MPI_Test fails many time before to tell that the IRecv is >> finished. >> >> I've tried that it fails also after one minutes, with very small >> buffer( less than eager limit). It's impossible that the communication >> is pending after one minutes, with 10 integer sended. To solve this, >> I need to implement a loop over MPI_Test, and only after 3 or 4 >> MPI_Test it returns that IRecv finished successful. Is it possible >> that MPI_Test needs to call many time also if the communication is >> already finished? >> >> In attach you have my simple C test program. >> >> Thanks in advance. >> >> -- >> Ing. Gabriele Fatigati >> >> Parallel programmer >> >> CINECA Systems & Tecnologies Department >> >> Supercomputing Group >> >> Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy >> >> www.cineca.it Tel: +39 051 6171722 >> >> g.fatigati [AT] cineca.it >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users >> > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > >
-- Ing. Gabriele Fatigati Parallel programmer CINECA Systems & Tecnologies Department Supercomputing Group Via Magnanelli 6/3, Casalecchio di Reno (BO) Italy www.cineca.it Tel: +39 051 6171722 g.fatigati [AT] cineca.it
