[Trilinos-Users] [EXTERNAL] OpenBLAS library for LAPACK

Fri Apr 4 07:42:30 MDT 2014

Dear Brent:
Thank  you for your help! Adding:

-DTrilinos_EXTRA_LINK_FLAGS:STRING="-lgfortran" \

to the do-configure file got rid of the errors. And make ran successfully.

I ran the test:

$ ctest -j16

One test failed from the 184, namely:

*********************************
The following tests FAILED:
 96 - TeuchosNumerics_BLAS_ROTG_test_MPI_1 (Failed)
Errors while running CTest
********************************

Does this mean there is a discrepancy between the OpenBLAS rotg and the
Teuchos implementation? Did anyone else encounter this? Workarounds?

Thanks! Best,
Gyorgy

On Thu, Apr 3, 2014 at 5:04 PM, Perschbacher, Brent M <bmpersc at sandia.gov>wrote:

>  First the failures during the configure step are fine. They are tests to
> see if features are available, the failure is just a report that the
> feature wasn't available, however, the code will work without those
> features. In this case it is possible that some of those are false failures
> based on the linking error you are getting. Once that is fixed it is
> possible that some of those will turn to success.
>
>  The issue you are seeing is that openblas apparently depends on
> gfortran. However, by default we link with the c++ compiler, which usually
> doesn't link in any necessary fortran libraries. You can get around this by
> adding the following to your configure script:
>
>  -DTrilinos_EXTRA_LINK_FLAGS:STRING=-lgfortran
>
>  Which should ensure that the gfortran library is linked properly.
>
>
>  Brent
>
>   From: Gyorgy Matyasfalvi <matyasfalvi at gmail.com>
> Date: Thursday, April 3, 2014 12:26 PM
> To: "trilinos-users at software.sandia.gov" <
> trilinos-users at software.sandia.gov>
> Subject: [EXTERNAL] [Trilinos-Users] OpenBLAS library for LAPACK
>
>   Dear User Community:
>
>  I am trying to build Trilinos on a 32 core (Intel Xeon ES-2660 @ 2.20
> GHz) Ubuntu (12.04) system.
>  I have encountered an error while trying to build all targets after the
> configuration step.
> I intended to use OpenBlas (libopenblas.a) for both the BLAS and the
> LAPACK library. It seems to me that this is causing the issue.
>
>  Initially I have noticed that some of the LAPACK tests during the
> configurations step fail. For example: DLARFP, SLARFP, ZLARFP ...
> Nonetheless the configuration step completes with:
> -- Configuring done
> and I only get one warning:
> ********************
>  CMake Warning:
>   Manually-specified variables were not used by the project:
>
>      Trilinos_ENABLE_TEUCHOS_TIME_MONITOR
>  *************************************************************
>
>  So I thought that the LAPACK functionality might not be needed for the
> Trilinos packages I am trying to install.
>
>
>  But then during the building phase I got the following error:
>  **********************************************************
> Building CXX object
> packages/teuchos/numerics/test/Polynomial/CMakeFiles/TeuchosNumerics_Polynomial_test.dir/cxx_main.cpp.o
>  /usr/local/openblas/lib/libopenblas.a(dtrtri_lapack.o): In function
> `dtrtrilapack_':
> dtrtri_lapack.f:(.text+0x140): undefined reference to
> `_gfortran_concat_string'
> /usr/local/openblas/lib/libopenblas.a(sgesvd.o): In function `sgesvd_':
> sgesvd.f:(.text+0x3cc): undefined reference to `_gfortran_concat_string'
> sgesvd.f:(.text+0xef8): undefined reference to `_gfortran_concat_string'
> /usr/local/openblas/lib/libopenblas.a(shseqr.o): In function `shseqr_':
> shseqr.f:(.text+0x3e2): undefined reference to `_gfortran_concat_string'
> /usr/local/openblas/lib/libopenblas.a(sormbr.o): In function `sormbr_':
> sormbr.f:(.text+0x3e3): undefined reference to `_gfortran_concat_string'
> /usr/local/openblas/lib/libopenblas.a(sormbr.o):sormbr.f:(.text+0x602):
> more undefined references to `_gfortran_concat_string' follow
> /usr/local/openblas/lib/libopenblas.a(ilaenv.o): In function `ilaenv_':
> ilaenv.f:(.text+0x8d): undefined reference to `_gfortran_compare_string'
> ilaenv.f:(.text+0xb4): undefined reference to `_gfortran_compare_string'
> ilaenv.f:(.text+0x26f): undefined reference to `_gfortran_compare_string'
> ilaenv.f:(.text+0x29c): undefined reference to `_gfortran_compare_string'
> ilaenv.f:(.text+0x2c2): undefined reference to `_gfortran_compare_string'
> /usr/local/openblas/lib/libopenblas.a(ilaenv.o):ilaenv.f:(.text+0x2e5):
> more undefined references to `_gfortran_compare_string' follow
> collect2: ld returned 1 exit status
> make[2]: ***
> [packages/teuchos/numerics/test/DenseMatrix/TeuchosNumerics_BandDenseSolver_test.exe]
> Error 1
> make[1]: ***
> [packages/teuchos/numerics/test/DenseMatrix/CMakeFiles/TeuchosNumerics_BandDenseSolver_test.dir/all]
> Error 2
> make[1]: *** Waiting for unfinished jobs....
>  *************************************************
>
>  If I just try to build Epetra with:
>
>  $ make Epetra_all
>
>  the build is successful, so it seems this issue is only affecting
> certain packages.
>
>  Did anyone else experience issues with OpenBLAS? Is there a fix? What
> are some of the LAPACK and BLAS libraries recommended for Trilinos?
>
>  Thanks! Best,
> Gyorgy
>
>
>  PS: My do-configure file:
> *************
>  #!/bin/bash
>
>  EXTRA_ARGS=$@
>
>  export CMAKE_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu
>
>  cmake \
> -D CMAKE_BUILD_TYPE:STRING=DEBUG \
> \
> -D TPL_ENABLE_BLAS:BOOL=ON \
> -D BLAS_INCLUDE_DIRS:PATH="/usr/local/openblas/" \
> -D BLAS_LIBRARY_DIRS:FILEPATH="/usr/local/openblas/lib" \
> -D BLAS_LIBRARY_NAMES:STRING="libopenblas.a" \
> \
> -D TPL_ENABLE_LAPACK:BOOL=ON \
> -D LAPACK_INCLUDE_DIRS:PATH="/usr/local/openblas/" \
> -D LAPACK_LIBRARY_DIRS:FILEPATH="/usr/local/openblas/lib" \
> -D LAPACK_LIBRARY_NAMES:STRING="libopenblas.a" \
> \
> -D TPL_ENABLE_MPI:BOOL=ON \
> \
> -D Trilinos_ENABLE_DEBUG:BOOL=ON \
> -D Trilinos_ENABLE_TESTS:BOOL=ON \
> -D Trilinos_ENABLE_OpenMP:BOOL=ON \
> -D Trilinos_ENABLE_Epetra:BOOL=ON \
> -D Trilinos_ENABLE_EpetraExt=ON \
> -D Trilinos_ENABLE_Kokkos:BOOL=ON \
> -D Kokkos_ENABLE_EXAMPLES:BOOL=ON \
> -D Trilinos_ENABLE_Teuchos:BOOL=ON \
> -D Trilinos_ENABLE_TEUCHOS_TIME_MONITOR:BOOL=ON \
> $EXTRA_ARGS \
> ../trilinos-11.4.3-Source
>  ***************************
>
>
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