[mpich-discuss] MPICH SSH?

[Zain elabedin hammade]

Hi ...

I think it is normal and there is no thing to worry about .
When you configure the MPI on  your cluster and let the Master see the workers , that cause implicitly to open a socket with each worker , those sockets don't be closed if you disable the SSH .rather the sockets will be closed if you stop daemons   .
Anyway tomorrow  I will try to run a program on my cluster after disabling SSH to  make sure.

> Date: Sat, 6 Mar 2010 15:30:37 +0100
> From: peter.smith3882100 at gmail.com
> To: mpich-discuss at mcs.anl.gov
> Subject: [mpich-discuss] MPICH SSH?
> 
> Hi
> 
> I have installed and configured MPICH2 version 1.2.1p1 in a test
> environment with one master and three worker nodes. I am new to MPICH
> and therefore i have used different tutorials on the net to configure
> the package. Everything seems to function correctly, when submitting
> the example program from the "Example program" section at
> http://en.wikipedia.org/wiki/Message_Passing_Interface i get the
> expected responses (i think). Passwordless SSH is configured on all
> machines as descriped in many of tutorials. If i disable SSH on the
> cluster, everything is still functional, i get the same responses from
> the example program and if i log into the worker nodes i can see the
> program being run in the task list. I dont understand why MPICH can
> still function when SSH is disabled?
> 
> I still have a lot of reading on the subject to understand the
> technology, but i thougt that i was pretty clear on that MPICH needed
> SSH to function?
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