[petsc-users] [beginner question] Different communicators in the two objects: Argument # 1 and 2 flag 3!

[Jed Brown]

Niklas Fischer <niklas at niklasfi.de> writes:
> thank you for your inputs. Unfortunately MPI does not seem to be the 
> issue here. The attachment contains a simple MPI hello world program 
> which runs flawlessly (I will append the output to this mail) and I have 
> not encountered any problems with other MPI programs. My question still 
> stands.

The output below is amazingly ugly and concerning.  Matt answered your
question, but in your build system, you should not be adding
-DPETSC_CLANGUAGE_CXX; that is a configure-time option, not something
that your code can change arbitrarily.  Your makefile should include
$PETSC_DIR/conf/variables (and conf/rules if you want, but not if you
want to write your own rules).

> mpirun -np 2 ./mpitest
>
> librdmacm: couldn't read ABI version.
> librdmacm: assuming: 4
> CMA: unable to get RDMA device list
> --------------------------------------------------------------------------
> [[44086,1],0]: A high-performance Open MPI point-to-point messaging module
> was unable to find any relevant network interfaces:
>
> Module: OpenFabrics (openib)
>    Host: dornroeschen.igpm.rwth-aachen.de
>
> Another transport will be used instead, although this may result in
> lower performance.
> --------------------------------------------------------------------------
> librdmacm: couldn't read ABI version.
> librdmacm: assuming: 4
> CMA: unable to get RDMA device list
> Hello world from processor dornroeschen.igpm.rwth-aachen.de, rank 0 out 
> of 2 processors
> Hello world from processor dornroeschen.igpm.rwth-aachen.de, rank 1 out 
> of 2 processors
> [dornroeschen.igpm.rwth-aachen.de:128141] 1 more process has sent help 
> message help-mpi-btl-base.txt / btl:no-nics
> [dornroeschen.igpm.rwth-aachen.de:128141] Set MCA parameter 
> "orte_base_help_aggregate" to 0 to see all help / error messages

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