I completely forgot to mention which version of OpenMPI I am using, I'll gladly post additional info if required :

kyron@kyron ~/openmpi-1.2 $ ompi_info |head

Open MPI: 1.2

Open MPI SVN revision: r14027

Open RTE: 1.2

Open RTE SVN revision: r14027

OPAL: 1.2

OPAL SVN revision: r14027

Prefix: /home/kyron/openmpi_i686

Configured architecture: i686-pc-linux-gnu

Configured by: kyron

Configured on: Wed Apr 4 10:21:34 EDT 2007

Le mercredi 4 avril 2007 11:47, Eric Thibodeau a Úcritá:

> Hello all,

>

> First off, please excuse the attached code as I may be naïve in my attempts to implement my own MPI_OP.

>

> I am attempting to create my own MPI_OP to use with MPI_Allreduce. I have been able to find very little examples off the net of creating MPI_OPs. My present references are "MPI The complete reference Volume 1 2nd edition" and some rather good slides I found at http://www.mpi-hd.mpg.de/personalhomes/stiff/MPI/ . I am attaching my "proof of concept" code which fails with:

>

> [kyron:14074] *** Process received signal ***

> [kyron:14074] Signal: Segmentation fault (11)

> [kyron:14074] Signal code: Address not mapped (1)

> [kyron:14074] Failing at address: 0x801da600

> [kyron:14074] [ 0] [0x6ffa6440]

> [kyron:14074] [ 1] /home/kyron/openmpi_i686/lib/openmpi/mca_coll_tuned.so(ompi_coll_tuned_allreduce_intra_recursivedoubling+0x700) [0x6fbb0dd0]

> [kyron:14074] [ 2] /home/kyron/openmpi_i686/lib/openmpi/mca_coll_tuned.so(ompi_coll_tuned_allreduce_intra_dec_fixed+0xb2) [0x6fbae9a2]

> [kyron:14074] [ 3] /home/kyron/openmpi_i686/lib/libmpi.so.0(PMPI_Allreduce+0x1a6) [0x6ff61e86]

> [kyron:14074] [ 4] AllReduceTest(main+0x180) [0x8048ee8]

> [kyron:14074] [ 5] /lib/libc.so.6(__libc_start_main+0xe3) [0x6fcbd823]

> [kyron:14074] *** End of error message ***

>

>

> Eric Thibodeau