[mvapich-discuss] run executable with no IB interface

[Steve White]

Hi,

We have often run into the problem that a user tries to run a test with a
single process on a machine that doesn't have an InfiniBand interface, but
it fails, and the error message is not helpful to explain why it failed.

The situation occurs, e.g. on a cluster with an IB interconnect, whose
head node has no IB interface.  The user compiles their executable to use
the IB interface, then wants to run a single-process test on the head node.

It could be we're doing something wrong.

Otherwise, I would recommend:

1) Improve the error messages to say explicitly that IB-configured
   MVAPICH can't run on a machine with no IB interface.

2) If only a single process is started, that it be allowed to run.

Thanks!

-- 
Steve White : Programmer
Max-Planck-Institut für Gravitationsphysik      Albert-Einstein-Institut
Am Mühlenberg 1, D-14476 Golm, Germany                  +49-331-567-7195