I have tried what you mentioned in the previous E-mail.

1- I have build MPICH for CPU node and ARM node.

2- Uploaded the binaries on same path on the 2 nodes.

3- Compiled helloWorld (it sends a number from process zero to all other processes ) for both nodes. Then tried mpiexec -np 2 -f <hostfile with mic hostnames>./helloworld

I got this error

Fatal error in MPI_Recv: Other MPI error, error stack:

MPI_Recv(200)................................: MPI_Recv(buf=0xbe9460d0, count=1, MPI_INT, src=0, tag=0, MPI_COMM_WORLD, status=0x1) failed

MPIDI_CH3i_Progress_wait(242)................: an error occurred while handling an event returned by MPIDU_Sock_Wait()

MPIDI_CH3I_Progress_handle_sock_event(554)...:

MPIDI_CH3_Sockconn_handle_connopen_event(899): unable to find the process group structure with id <>

Regards,

Doha

On Wed, Nov 16, 2016 at 6:38 PM, Min Si <msi@anl.gov> wrote:

I guess you might need to put all the MPICH binaries (e.g., hydra_pmi_proxy) to the same path on each node. I have executed MPICH on Intel MIC chips from the host CPU node where OS are different. The thing I did was:
1. build MPICH for both CPU node and MIC on the CPU node (you have done this step).
2. upload the MIC binaries to the same path on MIC chip as on the CPU node
For example:
- on CPU node : /tmp/mpich/install/bin holds the CPU version
- on MIC : /tmp/mpich/install/bin holds the MIC version
3. compile helloworld.c with the MIC version mpicc
4. execute on CPU node: mpiexe -np 2 -f <hostfile with mic hostnames>./helloworld

I think you should be able to follow step 2, but since your helloworld binary is also built with different OS, you might want to put it also into the same path on two nodes similar as we do for MPICH binaries.

Min

On 11/16/16 8:29 AM, Kenneth Raffenetti wrote:

Have you disabled any and all firewalls on both nodes? It sounds like they are unable to communicate in initialization.

Ken

On 11/16/2016 07:34 AM, Doha Ehab wrote:

Yes, I built MPICH-3 on both systems and I tried the code on each node
separately and it worked, I tried each node with other nodes that has
the same operating system and it worked as well.
When I try the code on the 2 nodes that have different operating systems
no result or error message appear.

Regards
Doha

On Mon, Nov 14, 2016 at 6:25 PM, Kenneth Raffenetti
<raffenet@mcs.anl.gov <mailto:raffenet@mcs.anl.gov>> wrote:

It may be possible to run in such a setup, but it would not be
recommended. Did you build MPICH on both systems you are trying to
run on? What exactly happened when the code didn't work?

Ken

On 11/13/2016 12:36 AM, Doha Ehab wrote:

Hello,
I tried to run a parallel (Hello World) C code on a cluster
that has 2
nodes, the nodes have different operating system so the code did not
work and no results were printed.
How to make such a cluster work? is there is extra steps that
should be
done?

Regards,
Doha

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