mpirun takes the #slots for each node from the slurm allocation. Your hostfile 
(at least, what you provided) retained that information and shows 2 slots on 
each node. So both the original allocation _and_ your constructed hostfile are 
both telling mpirun to assign 2 slots on each node.

Like I said before, on this old version, -H doesn’t say anything about #slots - 
that information is coming solely from the original allocation and your 

> On May 17, 2018, at 5:11 AM, Nicolas Deladerriere 
> <> wrote:
> About "-H" option and using --bynode option:
> In my case, I do not specify number of slots by node to openmpi (see mpirun 
> command just above). From what I see the only place I define number of slots 
> in this case is actually through SLURM configuration 
> (SLURM_JOB_CPUS_PER_NODE=4(x3)). And I was not expected this to be taken when 
> running mpi processes.
> Using --bynode is probably the easiest solution in my case, even if I am 
> scared that it will not necessary fit all my running configuration. Better 
> solution would be to review my management script for better integration with 
> slurm resources manager, but this is another story.

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