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Subject: Re: [OMPI devel] Problem with the openmpi-default-hostfile (on the trunk)
From: pascal.deveze_at_[hidden]
Date: 2012-02-28 03:25:02

devel-bounces_at_[hidden] a écrit sur 27/02/2012 15:53:06 :

> De : Ralph Castain <rhc_at_[hidden]>
> A : Open MPI Developers <devel_at_[hidden]>
> Date : 27/02/2012 16:17
> Objet : Re: [OMPI devel] Problem with the openmpi-default-hostfile
> (on the trunk)
> Envoyé par : devel-bounces_at_[hidden]
> That's strange - I run on slurm frequently and never have this
> problem, and my default hostfile is present and empty. Do you have
> anything in your default mca param file that might be telling us to
> use the hostfile?
> The only way I can find to get that behavior is if your default mca
> param file includes the orte_default_hostfile value. In that case,
> you are telling us to use the default hostfile, and so we will enforce

Hi Ralph,

On my side, the default value of orte_default_hostfile is a pointer to
The command ompi_info -a gives :

MCA orte: parameter "orte_default_hostfile" (current value:
<..../etc/openmpi-default-hostfile>, data source: default value)
Name of the default hostfile (relative or absolute path, "none" to ignore
environmental or default MCA param setting)

The following files are empty:
 - .../etc/openmpi-mca-params.conf
 - $HOME/.openmpi/mca-params.conf
Another solution for me is to put "orte_default_hostfile=none" in one of
these files.


> On Feb 27, 2012, at 5:57 AM, pascal.deveze_at_[hidden] wrote:
> Hi all,
> I have problems with the openmpi-default-hostfile since the
> following patch on the trunk
> changeset: 19874:088fc6c84a9f
> user: rhc
> date: Wed Feb 01 17:40:44 2012 +0000
> summary: In accordance with prior releases, we are supposed to
> default to looking at the openmpi-default-hostfile as a default
> hostfile. Restore that behavior, but ignore the file if it is empty.
> Allow the user to ignore any MCA param setting pointing to a default
> hostfile by setting the param to "none" (via cmd line or whatever) -
> this allows them to override a setting in the system default MCA param
> According to the summary of this patch, the openmpi-default-hostfile
> is ignored if it is empty.
> But, when I run my jobs with slurm + mpirun, I get the following

> No nodes are available for this job, either due to a failure to
> allocate nodes to the job, or allocated nodes being marked
> as unavailable (e.g., down, rebooting, or a process attempting
> to be relocated to another node when none are available).

> I am able to run my job if:
> - either I put my node(s) in the file etc/openmpi-default-hostfile
> - or use "-mca orte_default_hostfile=none" in the mpirun command line
> - or "export OMPI_MCA_orte_default_hostfile none" in my environment
> It appears that an empty openmpi-default-hostfile is not ignored.
> This patch seems not be complete
> Or do I misunderstand something ?
> Pascal Devèze_______________________________________________
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