Re: [OMPI users] random problems with a ring communication example

On Mar 15, 2014, at 6:21 PM, christophe petit wrote: > Ok, so from what you say, on a "execution system" point view, the ring > communication is well achieved (i.e respecting the good order with, in last > position, rank0 which receives from rank 6) but the

Re: [OMPI users] random problems with a ring communication example

Ok, so from what you say, on a "execution system" point view, the ring communication is well achieved (i.e respecting the good order with, in last position, rank0 which receives from rank 6) but the stdout doesn't reflect what really happened, does it ? Is there a way to make stdout respect the

Re: [OMPI users] random problems with a ring communication example

The explanation is simple: there is no rule about ordering of stdout. So even though your rank0 may receive its MPI message last, its stdout may well be printed before one generated on a remote node. Reason is that rank 0 may well be local to mpirun, and thus the stdout can be handled

[OMPI users] random problems with a ring communication example

Hello, I followed a simple MPI example to do a ring communication. Here's the figure that illustrates this example with 7 processes : http://i.imgur.com/Wrd6acv.png Here the code :