Hi Eddie

Open MPI needs to create a temporary file system – what we call our “session directory” - where it stores things like the shared memory file. From this output, it appears that your /tmp directory is “locked” to root access only.

You have three options for resolving this problem:

(a) you could make /tmp accessible to general users;

(b) you could use the —tmpdir xxx command line option to point Open MPI at another directory that is accessible to the user (for example, you could use a “tmp” directory under the user’s home directory); or

(c) you could set an MCA parameter OMPI_MCA_tmpdir_base to identify a directory we can use instead of /tmp.

 If you select options (b) or (c), the only requirement is that this location must be accessible on every node being used. Let me be clear on this: the tmp directory must not be NSF mounted and therefore shared across all nodes. However, each node must be able to access a location of the given name – that location should be strictly local to each node.

Hope that helps
Ralph



On 1/17/07 12:25 AM, "eddie168" <eddie168+ompi_user@gmail.com> wrote:

Dear all,
 
I have recently installed OpenMPI 1.1.2 on a OpenSSI cluster running Fedora core 3. I tested a simple hello world mpi program (attached) and it runs ok as root. However, if I run the same program under normal user, it gives the following error:
 
[eddie@oceanus:~/home2/mpi_tut]$ mpirun -np 2 tut01
[oceanus:125089] mca_common_sm_mmap_init: ftruncate failed with errno=13
[oceanus:125089] mca_mpool_sm_init: unable to create shared memory mapping ( /tmp/openmpi-sessions-eddie@localhost_0/default-universe/1/shared_mem_pool.localhost)
--------------------------------------------------------------------------
It looks like MPI_INIT failed for some reason; your parallel process is
likely to abort.  There are many reasons that a parallel process can
fail during MPI_INIT; some of which are due to configuration or environment
problems.  This failure appears to be an internal failure; here's some
additional information (which may only be relevant to an Open MPI
developer):
  PML add procs failed
  --> Returned "Out of resource" (-2) instead of "Success" (0)
--------------------------------------------------------------------------
*** An error occurred in MPI_Init
*** before MPI was initialized
*** MPI_ERRORS_ARE_FATAL (goodbye)
[eddie@oceanus:~/home2/mpi_tut]$

Am I need to give certain permission to the user in order to oversubscribe processes?

Thanks in advance,

Eddie.

 


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