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Compiling INMOST with Trilinos on Linux
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======
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INMOST is known to work with Trilinos version 11.12.1.
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## Compiling Trilinos
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You can download Trilinos package from http://trilinos.org/download/. Please note that in order to download it you have to provide some basic information about yourself. Place the source archive in `$INMOST_ROOT` directory.
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Trilinos needs two third party libraries: BLAS and LAPACK. Both of them usually can be easily installed system-wide by your system administrator. You may install them manually, in this case you should provide the full path to the libraries below. If you are planning to use PETSc, then PETSc installer can install both BLAS and LAPACK for you, refer to [[PETSc installation guide|0403-Compilation-PETSc-Linux]] for detail information.
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We will unpack Trilinos source archive and create new build directory for Trilinos compilation.
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We will also define two variables `TRILINOS_BASE` and `TRILINOS_INSTALL_PATH`, those will be used later.
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```
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cd "$INMOST_ROOT"
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tar jxf trilinos-11.12.1-Source.tar.bz2
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cd trilinos-11.12.1-Source
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export TRILINOS_BASE="`pwd`"
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export TRILINOS_INSTALL_PATH="$TRILINOS_BASE/installed"
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mkdir -p build
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cd build
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```
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At this point we recommend you to create a helper script and configuration file.
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We predefined the set of required Trilinos packages, enabled MPI support, and also defined INSTALL_PREFIX.
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For fine-tuning and troubleshooting your configuration refer to [Trilinos quick reference guide](http://trilinos.org/oldsite/TrilinosBuildQuickRef.html).
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```
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cat > do-configure << EOF
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#!/bin/bash
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export SOURCE_BASE="$TRILINOS_BASE"
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EXTRA_ARGS=\$@
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cmake \\
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-D Trilinos_CONFIGURE_OPTIONS_FILE="`pwd`/MyConfigureOptions.cmake" \\
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\$EXTRA_ARGS \\
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\${SOURCE_BASE}
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EOF
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chmod +x do-configure
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cat > MyConfigureOptions.cmake << EOF
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SET(CMAKE_INSTALL_PREFIX "$TRILINOS_INSTALL_PATH" CACHE PATH "" FORCE)
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SET(TPL_ENABLE_MPI ON CACHE BOOL "" FORCE)
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SET(Trilinos_ENABLE_ALL_OPTIONAL_PACKAGES OFF CACHE BOOL "" FORCE)
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SET(Trilinos_ENABLE_Epetra ON CACHE BOOL "" FORCE)
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SET(Trilinos_ENABLE_AztecOO ON CACHE BOOL "" FORCE)
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SET(Trilinos_ENABLE_Ifpack ON CACHE BOOL "" FORCE)
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SET(Trilinos_ENABLE_ML ON CACHE BOOL "" FORCE)
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SET(Trilinos_ENABLE_Amesos ON CACHE BOOL "" FORCE)
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SET(Trilinos_ENABLE_Belos ON CACHE BOOL "" FORCE)
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EOF
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```
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Now you are ready to configure and build Trilinos package, these steps can take some time. Note, if you need to provide path to BLAS and LAPACK libraries, just add options `TPL_BLAS_LIBRARIES` and `TPL_LAPACK_LIBRARIES` to `do-configure` script (e.g., if you used PETSc installer: `./do-configure -DTPL_BLAS_LIBRARIES="$PETSC_DIR/$PETSC_ARCH/lib/libf2cblas.a" -DTPL_LAPACK_LIBRARIES="$PETSC_DIR/$PETSC_ARCH/lib/libf2clapack.a"`)
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```
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./do-configure
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make all
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make install
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```
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## Compiling INMOST with Trilinos support
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Make sure the environment variable `TRILINOS_INSTALL_PATH` is initialized correctly, see above.
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CMake will detect your Trilinos installation if you provide the install path.
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```
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cd "$INMOST_ROOT"
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mkdir -p INMOST-build
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cd INMOST-build
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cmake -DUSE_SOLVER_TRILINOS=ON -DTRILINOS_PATH="$TRILINOS_INSTALL_PATH" ../INMOST-master
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make all
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``` |
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\ No newline at end of file |
