[mpich-discuss] MPICH2 and OpenPBS/Torque using MPICH2-Hydra

[balaji at mcs.anl.gov]

PBS support is not added in Hydra yet. See: https://trac.mcs.anl.gov/projects/mpich2/ticket/443

However, so far we were considering PBS support as a bootstrap server (which has a lot more functionality than just providing the number of nodes). But adding PBS as a resource management kernel (RMK) is possible too and should be simpler as well. Doing this will allow you to skip the "-n" option in PBS environments, but you'll internally still be using ssh to start the processes. If this is helpful for you, we can consider adding it for the next release.

 -- Pavan

----- "Si Hammond" <simon.hammond at gmail.com> wrote:

> Hi everyone,
> 
> We're trying to get MPICH2 to work under PBS so that users don't need 
> 
> to specify the number of processors etc. We have built the install  
> with the MPICH2-Hydra device and this seems to work (in that jobs will
>  
> run) but users still have to specify the number of MPI ranks using
> -n.
> 
> I found the -rmk flag in some documentation using Google but "-rmk  
> pbs" doesn't seem to work either (the example uses "-rmk lsf")
> 
> How does a user like myself go about making a PBS-enabled MPICH2 build
>  
> to the job placement etc is all handled under the covers? Is this  
> possible? OpenMPI seems to have this covered but we'd like to install 
> 
> MPICH2 as well since one of our codes only runs with MPICH2.
> 
> Thanks for your help.
> 
> 
> 
> ---------------------------------------------------------------------------------------
> Si Hammond
> 
> Performance Modelling, Analysis and Optimisation Laboratory
> High Performance Systems Group
> Department of Computer Science
> University of Warwick, CV4 7AL, UK
> ----------------------------------------------------------------------------------------