[mpich-discuss] Fix for problems with mpich-3.1.4 and slurm-14.11

[Kenneth Raffenetti]

Hi Bill,

Thanks for reporting this. Sounds like something we need to handle in 
the Hydra name resolution code. I've created a ticket in Trac for it.

http://trac.mpich.org/projects/mpich/ticket/2263

Ken

On 05/28/2015 10:44 PM, Bill Broadley wrote:
>
> I tried a quite a few variations on ubuntu's slurm, slurm-14.11.7, and
> numerous build options for mpich.
>
> Turns out the ubuntu incompatibility with mpich is because in /etc/hosts
> the hostname typically resolves to 127.0.1.1.  Thus when hydra grabs IPs
> for both hosts it ends up with the wrong IP.
>
> If I remove the line in /etc/hosts with the hostname and 127.0.1.1 it
> just works.  Might be worth having mpich warn about using a 127.0.1.1
> IP, at least when using more than one node.  I poured over the verbose
> logs and hydra debug logs without noticing the problem.
>
> OpenMPI doesn't have this problem for whatever reason.
>
>
>
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