FWIW: we also automatically detect that the application is a singularity 
container and do the right stuff


> On Dec 12, 2018, at 12:25 AM, Gilles Gouaillardet <gil...@rist.or.jp> wrote:
> 
> My understanding is that MPI tasks will be launched inside a singularity 
> container.
> 
> In a typical environment, mpirun spawns an instance of the orted on each 
> node, and then each orted daemon (or mpirun on the local node) fork&exec the 
> MPI tasks (a.out)
> 
> 
> With singularity, orted would fork&exec a container running a.out
> 
> (not sure if it is one container per task, or one container per node)
> 
> 
> Cheers,
> 
> 
> Gilles
> 
> On 12/10/2018 5:00 AM, Johnson, Glenn P wrote:
>> Greetings,
>> 
>> Could someone explain, or point to documentation that explains, what the 
>> --with-singularity option enables with regard to OpenMPI support for 
>> singularity containers?
>> 
>> Thanks.
>> 
>> Glenn Johnson
>> 
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