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From: Eric Thibodeau (kyron_at_[hidden])
Date: 2007-04-04 11:47:05


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