We already do that as a check, but it came after the 1.6 series - and so you 
get the old error message if you mix with the 1.6 series or older versions.

> On May 16, 2016, at 8:22 AM, Gilles Gouaillardet 
> <gilles.gouaillar...@gmail.com> wrote:
> 
> or this could be caused by a firewall ...
> v1.10 and earlier uses tcp for  oob,
> from v2.x, unix sockets are used
> 
> detecting consistent version is a good idea,
> printing them (mpirun, orted and a.out) can be a first step.
> 
> my idea is
> mpirun invokes orted with '--ompi_version=x.y.z'
> orted checks it is running version x.y.z, and sets the OMPI_VERSION 
> environment variable.
> a.out checks it is running version x.y.z
> /* we might have to check opal, orte and ompi versions, except orted that 
> should not require MPI */
> 
> any thoughts ?
> 
> Cheers,
> 
> Gilles
> 
> 
> 
> On Tuesday, May 17, 2016, Dave Love <d.l...@liverpool.ac.uk 
> <mailto:d.l...@liverpool.ac.uk>> wrote:
> Ralph Castain <r...@open-mpi.org <javascript:;>> writes:
> 
> > This usually indicates that the remote process is using a different OMPI
> > version. You might check to ensure that the paths on the remote nodes are
> > correct.
> 
> That seems quite a common problem with non-obvious failure modes.
> 
> Is it not possible to have a mechanism that checks the consistency of
> the components and aborts in a clear way?  I've never thought it out,
> but it seems that some combination of OOB messages, library versioning
> (at least with ELF) and environment variables might do it.
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