[Rocks-Discuss] OpenMPI issue

[Michael Duncan]

I'm running into an issue I can't quite solve. I'm hoping a lurking
guru here can help me out J

Installed Rocks 5.2 on a 3-node cluster for training purposes

/opt/openmpi exists

DL'ed and compiled GotoBLAS in my home dir

Compiled HPL (Linpack) in my home directory with /opt/openmpi as the
MPdir parameter in the make file

I am getting the following error when running it from the same dir

[miked ]$ /opt/openmpi/bin/mpirun -np 4 -machinefile machines ./xhpl

------------------------------------------------------------------------
--

mpirun was unable to launch the specified application as it could not
access

or execute an executable:

Executable: ./xhpl

Node: compute-0-0

while attempting to start process rank 0.

------------------------------------------------------------------------
--

ls -ls:

total 360

4 -rw-r--r-- 1 miked miked 1133 Feb 9 10:57 HPL.dat

4 -rw-rw-rw- 1 miked miked 96 Feb 9 10:58 machines

4 -rw-rw-r-- 1 miked miked 48 Feb 9 13:02 machines1

348 -rwxrwxr-x 1 miked miked 351253 Feb 9 14:34 xhpl

------------------

Mike

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[Joerg Hohwieler]

On Tue, 09 Feb 2010 - 20:38, Michael Duncan wrote:
> I'm running into an issue I can't quite solve. I'm hoping a lurking
> guru here can help me out J
>
>
>
> Installed Rocks 5.2 on a 3-node cluster for training purposes
>
> /opt/openmpi exists
>
> DL'ed and compiled GotoBLAS in my home dir
>
> Compiled HPL (Linpack) in my home directory with /opt/openmpi as the
> MPdir parameter in the make file
>
>
>
> I am getting the following error when running it from the same dir
>
>
>
> [miked ]$ /opt/openmpi/bin/mpirun -np 4 -machinefile machines ./xhpl
>
> ------------------------------------------------------------------------
> --
>
> mpirun was unable to launch the specified application as it could not
> access
>
> or execute an executable:
>
>
>
> Executable: ./xhpl
>
> Node: compute-0-0

try running an executable which will surely be accesible on the compute
nodes to see if openmpi is working basically. E.g.

$ /opt/openmpi/bin/mpirun -np 4 -machinefile machines uptime

Does /opt/openmpi also exist on the compute nodes?

- jh

[Michael Duncan]

Thanks for the reply!

It turns out that when I run mpirun, as opposed to
/opt/openmpi/bin/mpirun, it works

"which mpirun" points to /opt/openmpi/bin/mpirun

Go figure

I also ran into an environment issue. Once I got the above to work, I
noticed the xhpl executable wasn't reading the correct HPL.dat file.
Logged out, and logged back in. Everything works as desired now.

Still not sure *why* the straight "mpirun" worked while specifying the
absolute path does not.

/opt/openmpi does exist on all nodes.

------------------
Mike

- jh

NOTICE: