Depends on which launcher you are using.  My understanding is that you can use torque to launch the MPI processes on remote nodes, but you must compile this support into OpenMPI.  Please, someone correct me if I am wrong.   <div>
<br></div><div>For most clusters I work with and manage, we use passwordless keys.  The reason is that sometimes MPI implementations, like those provided by many vendords do not supply the requisite functionality to integrate with Torque, such as the Intel&#39;s OpenMPI tools or Comsol&#39;s bundled MPI implementation as an example.  </div>
<div><br></div><div>So really, it boils down to your needs.  </div><div><br>Thanks</div><div><br>Randall<br><br><div class="gmail_quote">On Wed, Feb 29, 2012 at 1:09 PM, Denver Smith <span dir="ltr">&lt;<a href="mailto:denver.smith@usu.edu">denver.smith@usu.edu</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




<div>
<div style="direction:ltr;font-size:10pt;font-family:Tahoma">
<div>Hello,</div>
<div><br>
</div>
On my cluster running moab and torque, I cannot ssh without a password between compute nodes. I can however request multiple node jobs fine. I was wondering if passwordless ssh keys need to be set up between compute nodes in order for mpi applications to run
 correctly.
<div><br>
</div>
<div>Thanks</div>
</div>
</div>

<br>_______________________________________________<br>
users mailing list<br>
<a href="mailto:users@open-mpi.org">users@open-mpi.org</a><br>
<a href="http://www.open-mpi.org/mailman/listinfo.cgi/users" target="_blank">http://www.open-mpi.org/mailman/listinfo.cgi/users</a><br></blockquote></div><br><br clear="all"><div><br></div>-- <br>Randall Svancara<br><a href="http://www.knowyourlinux.com/" target="_blank">Know Your Linux?</a><br>

</div>