[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:

> Hello,
>
> I have attached a small test case for a problem I am experiencing. What
> this dummy program does is it reads a vector and a matrix from a text
> file and then solves Ax=b. The same data is available in two forms:
>  - everything is in one file (matops.s.0 and vops.s.0)
>  - the matrix and vector are split between processes (matops.0,
> matops.1, vops.0, vops.1)
>
> The serial version of the program works perfectly fine but unfortunately
> errors occure, when running the parallel version:
>
> make && mpirun -n 2 a.out matops vops
>
> mpic++ -DPETSC_CLANGUAGE_CXX -isystem
> /home/data/fischer/libs/petsc-3.4.3/arch-linux2-c-debug/include -isystem
> /home/data/fischer/libs/petsc-3.4.3/include petsctest.cpp -Werror -Wall
> -Wpedantic -std=c++11 -L
> /home/data/fischer/libs/petsc-3.4.3/arch-linux2-c-debug/lib -lpetsc
> /usr/bin/ld: warning: libmpi_cxx.so.0, needed by
> /home/data/fischer/libs/petsc-3.4.3/arch-linux2-c-debug/lib/libpetsc.so,
> may conflict with libmpi_cxx.so.1
> /usr/bin/ld: warning: libmpi.so.0, needed by
> /home/data/fischer/libs/petsc-3.4.3/arch-linux2-c-debug/lib/libpetsc.so,
> may conflict with libmpi.so.1
> librdmacm: couldn't read ABI version.
> librdmacm: assuming: 4
> CMA: unable to get RDMA device list
> --------------------------------------------------------------------------
> [[43019,1],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
> CMA: unable to get RDMA device list

It looks like your MPI is either broken or some of the code linked into
your application was compiled with a different MPI or different version.
Make sure you can compile and run simple MPI programs in parallel.
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