Looks like bit-rot has struck the sequential mapper support - I'll revive it 
for 1.8.1

On Apr 6, 2014, at 7:17 PM, Chen Bill <billchen...@gmail.com> wrote:

> Hi ,
> 
> I just tried the openmpi 1.8, but I found the feature --mca rmaps seq doesn't 
> work.
> 
> for example,
> 
> >mpirun -np 4 -hostfile hostsfle --mca rmaps seq hostname
> 
> It shows below error,
> 
> --------------------------------------------------------------------------
> Your job failed to map. Either no mapper was available, or none
> of the available mappers was able to perform the requested
> mapping operation. This can happen if you request a map type
> (e.g., loadbalance) and the corresponding mapper was not built.
> --------------------------------------------------------------------------
> 
> but when I use ompi_info ,it shows has this feature
> 
> 
> >ompi_info |grep -i rmaps
>                MCA rmaps: lama (MCA v2.0, API v2.0, Component v1.8)
>                MCA rmaps: mindist (MCA v2.0, API v2.0, Component v1.8)
>                MCA rmaps: ppr (MCA v2.0, API v2.0, Component v1.8)
>                MCA rmaps: rank_file (MCA v2.0, API v2.0, Component v1.8)
>                MCA rmaps: resilient (MCA v2.0, API v2.0, Component v1.8)
>                MCA rmaps: round_robin (MCA v2.0, API v2.0, Component v1.8)
>                MCA rmaps: seq (MCA v2.0, API v2.0, Component v1.8)
>                MCA rmaps: staged (MCA v2.0, API v2.0, Component v1.8)
> 
> Any suggestions?
> 
> Many thanks,
> Bill
> 
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