Re: [OMPI users] Number of processes and spawn

2011-03-07 Thread Federico Golfrè Andreasi
Hi Ralph, thank you very much for the detailed response. I have to apologize I was not clear: I would like to use the MPI_spawn_multiple function. (I've attached the example program I use) . In any case I tryed your test program, just compling it with: /home/fandreasi/openmpi-1.7/bin/mpicc loop_

Re: [OMPI users] Number of processes and spawn

2011-03-07 Thread Ralph Castain
On Mar 7, 2011, at 3:24 AM, Federico Golfrè Andreasi wrote: > Hi Ralph, > > thank you very much for the detailed response. > > I have to apologize I was not clear: I would like to use the > MPI_spawn_multiple function. Shouldn't matter - it's the same code path. > (I've attached the example

Re: [OMPI users] RoCE (IBoE) & OpenMPI

2011-03-07 Thread Jeff Squyres
I'm told that it is not required; it *could* use OMPI's oob CPC if we wanted it to. But that's second-hand information; I don't know that for sure. On Mar 6, 2011, at 8:52 AM, Doron Shoham wrote: > ibv_rc_pingpong runs over verbs and not RDMA_CM. > As far as I understood, RoCE requires the use

[OMPI users] MPI_Allgather/MPI_Allgatherv with odd-number nodes

2011-03-07 Thread 孟宪军
Dear all, I am doing some tests using MPI_Allgatherv function recently. After these tests, I found a wield problem of if. When I wanted to use the MPI_Allgatherv function to gather a large number of data from some processes(for example, 2GB data per process). If the number of processes was even n