Thanks Peter.  Blocking the shared memory layer did the trick for our program too. 

For the record, we also have SGI Propack 6 installed (sgi-propack-release-6-sgi600r3).

Is the on-node shared memory support completely blocked?  What if the MPI process calls a procedure that uses OpenMP threads, for instance?


On Thu, Nov 13, 2008 at 1:44 PM, Peter Cebull <peter.cebull@inl.gov> wrote:
Geraldo,

The previous message you saw was for our Altix ICE system. Since we started seeing these errors after upgrading to SGI Propack 6, I wonder if there's a bug somewhere in the Propack software or an incompatibility between Open MPI and OFED 1.3 (we had no problems under OFED 1.2). A workaround I stumbled across is to turn off the sm component:

mpirun --mca btl ^sm . . .

That seems to allow our application to run, although I guess at the expense of losing on-node shared memory support.

Peter

Geraldo Veiga wrote:
Hi to all,

I am using the same subject of a recent message I found in the list archives of this mailing list:

http://www.open-mpi.org/community/lists/users/2008/10/7025.php

There was no follow-up  on that one, but will add this similar report in case a list member can give us an idea of how to correct it.  Or whose bug this could be.

My application behaves as expected when I run it in a single host and multiple MPI nodes  of  our  SGI Altix ICE 8200 cluster  with in InfiniBand.   When I try the same with multiple hosts, using the PBS batch system the program terminates with a segmentation fault:

-------
[r1i0n9:09192] *** Process received signal ***
[r1i0n9:09192] Signal: Bus error (7)
[r1i0n9:09192] Signal code:  (2)
[r1i0n9:09192] Failing at address: 0x2b67ca0c8c20
[r1i0n9:09192] [ 0] /lib64/libpthread.so.0 [0x2b67bfdb1c00]
[r1i0n9:09192] [ 1] /sw/openmpi_intel/1.2.8/lib/libmpi.so.0(ompi_free_list_grow+0x14a) [0x2b67bf499b38]
[r1i0n9:09192] [ 2] /sw/openmpi_intel/1.2.8/lib/openmpi/mca_btl_sm.so(mca_btl_sm_alloc+0x321) [0x2b67c3a43e15]
[r1i0n9:09192] [ 3] /sw/openmpi_intel/1.2.8/lib/openmpi/mca_pml_ob1.so(mca_pml_ob1_send_request_start_copy+0x26d) [0x2b67c34e9041]
[r1i0n9:09192] [ 4] /sw/openmpi_intel/1.2.8/lib/openmpi/mca_pml_ob1.so(mca_pml_ob1_isend+0x540) [0x2b67c34e17ec]
[r1i0n9:09192] [ 5] /sw/openmpi_intel/1.2.8/lib/libmpi.so.0(PMPI_Isend+0x63) [0x2b67bf4dcd1f]
[r1i0n9:09192] [ 6] /sw/openmpi_intel/1.2.8/lib/libmpi_f77.so.0(pmpi_isend+0x8f) [0x2b67bf36a03f]
[r1i0n9:09192] [ 7] dsimpletest(dmumps_comm_buffer_mp_dmumps_519_+0x449) [0x53e19b]
[r1i0n9:09192] [ 8] dsimpletest(dmumps_load_mp_dmumps_512_+0x20b) [0x54fda1]
[r1i0n9:09192] [ 9] dsimpletest(dmumps_251_+0x4995) [0x4d273b]
[r1i0n9:09192] [10] dsimpletest(dmumps_244_+0x808) [0x484e38]
[r1i0n9:09192] [11] dsimpletest(dmumps_142_+0x8717) [0x4bf5eb]
[r1i0n9:09192] [12] dsimpletest(dmumps_+0x1554) [0x43a720]
[r1i0n9:09192] [13] dsimpletest(MAIN__+0x50b) [0x41e4c3]
[r1i0n9:09192] [14] dsimpletest(main+0x3c) [0x683d4c]
[r1i0n9:09192] [15] /lib64/libc.so.6(__libc_start_main+0xf4) [0x2b67bfeda184]
[r1i0n9:09192] [16] dsimpletest(dtrmv_+0xa1) [0x41df29]
[r1i0n9:09192] *** End of error message ***
----

Most of the software infrastructure is provided by the Intel propack.  Any hints of where to look further into this bug?

Thanks in advance.

--
Geraldo Veiga <gveiga@gmail.com <mailto:gveiga@gmail.com>>
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--
Peter Cebull


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--
Geraldo Veiga <gveiga@gmail.com>