[mvapich-discuss] How to Specify Processes Per Node With mvapich

[Susan A. Schwarz]

Hi Jonathan,

Thanks for your email. So you are saying that I need to make my own 
hostfile and since I am using torque, I am going to have to have my 
submit script read the $PBS_NODEFILE and then make a hostfile to use 
with the mpirun_rsh command. Is that correct?

It would be nice to have a "ppn" command line option in a future version!

Susan


On 04/22/2014 01:30 PM, Jonathan Perkins wrote:
> Hello Susan.
>
> In order to control the number of processes per node with mpirun_rsh
> you will need to provide a hostfile and use the extended syntax for
> each hostname.
>
> For example:
> $ cat hostfile
> node1:8
> node2:8
> node3:8
> node4:8
>
> When using this hostfile mpirun_rsh will place 8 processes for each
> node.  Please see section 5.2.1 of our userguide for more information
> on how to use this
> (http://mvapich.cse.ohio-state.edu/support/user_guide_mvapich2-1.9.html#x1-250005.2.1).
>
> I think that you will also be happy to find that mvapich2 also
> provides the same hydra (mpiexec) as mpich so that you can run your
> mpich and mvapich2 jobs using the same process.  Section 5.2.2 of our
> userguide provides a brief overview of this as well
> (http://mvapich.cse.ohio-state.edu/support/user_guide_mvapich2-1.9.html#x1-330005.2.2).
>
> On Tue, Apr 22, 2014 at 12:26 PM, Susan A. Schwarz
> <Susan.A.Schwarz at dartmouth.edu> wrote:
>> I am running mvapich2 v1.9 on a CentOS 6.5 cluster with torque 4.2.6.1. I
>> need to be able to be able to specify the number of processes per node when
>> I start my mvapich program. If I was using mpich and starting my program
>> with mpirun or mpiexec,  I would use the "-ppn" option.  I don't see any
>> arguments similar to that when I use mpirun_rsh to start my mvapich program.
>>
>> We used to use the OSU mpiexec v0.84  before we upgraded our cluster to use
>> Centos 6.5 and torque 4.2.6.1 but now I can't get my mvapich2 programs to
>> launch with mpiexec so I can't take advantage of the "-npernode" option. I
>> get a fatal error in MPI_Init when I launch my mvapich2 program with
>> mpiexec.
>>
>> Is there a way to start my mvapich program and specify the number of
>> processes per node.
>>
>> thank you,
>> Susan Schwarz
>> Research Computing
>> Dartmouth College
>>
>>
>>
>>
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>>
>>
>
>