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

[Matthew Knepley]

On Tue, Apr 22, 2014 at 6:48 AM, Niklas Fischer <niklas at niklasfi.de> wrote:

> Am 22.04.2014 13:08, schrieb 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.
>>
> Hello Jed,
>
> 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.
>

This is a simple error. You created the matrix A using PETSC_COMM_WORLD,
but you try to view it
using PETSC_VIEWER_STDOUT_SELF. You need to use PETSC_VIEWER_STDOUT_WORLD in
order to match.

  Thanks,

     Matt


> Greetings,
> Niklas Fischer
>
> 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
>



-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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