[mpich-discuss] How does MPICH spawn processes, and is there a way to configure it?

[Scott O'Malley]

I've looked through the hydra docs but I haven't found a flag or anything
else that would let me disable it spawning in tree mode, if MPICH even does
that.

I was able to kind of rectify the error using OpenMPI and specifying the "-mca
plm_rsh_no_tree_spawn" flag


On 29 May 2014 14:54, Lu, Huiwei <huiweilu at mcs.anl.gov> wrote:

> Hi Scott,
>
> Check
> https://wiki.mpich.org/mpich/index.php/Using_the_Hydra_Process_Manager to
> see if it is what you want.
>
> Best,
> —
> Huiwei
>
> On May 29, 2014, at 6:37 AM, Scott O'Malley <scottyomalley at gmail.com>
> wrote:
>
> > I have recently built a cluster of Raspberry Pi computers. When this was
> made up of a master node and 2 slave nodes there was no issue calling
> mpiexec across the cluster. When I add an additional node to the cluster
> bringing the size to 1 master and 3 slave nodes I get an error of "Host
> File Verification Failed". I've tested password-less SSH on all nodes and
> it's working correctly.
> >
> > I've done some googling of the error and set up and the only mention
> I've gotten to it was on this link here relating to OpenMPI -
> http://www.open-mpi.org/community/lists/users/2013/11/22940.php
> >
> > Is there a similar setup for MPICH and if so can someone link me to the
> correct documentation page?
> >
> > Cheers
> >
> > Scott
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-- 
- Scott
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