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Compiling INMOST with PETSc on Linux
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======
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INMOST requires PETSc version 3.5.0 or higher.
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## Compiling PETSc
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PETSc installer can also install a lot of other dependencies for you.
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The following instructions assume that MPI is already installed and functional. You can use option `--download-openmpi` to install Open MPI with PETSc.
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These steps can take some time.
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```
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cd "$INMOST_ROOT"
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wget http://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-lite-3.5.2.tar.gz
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tar zxf petsc-3.5.2.tar.gz
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rm -f petsc-3.5.2.tar.gz
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cd petsc-3.5.2
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export PETSC_DIR="`pwd`"
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export PETSC_ARCH=linux-gnu-debug
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./configure --download-f2cblaslapack --with-mpi=1
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make all
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```
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You may as well compile optimized version of PETSc for timing and production runs.
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```
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PETSC_ARCH=linux-gnu-opt ./configure --download-f2cblaslapack --with-mpi=1 --with-debugging=0 -CFLAGS="-O2" -CXXFLAGS="-O2"
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make PETSC_ARCH=linux-gnu-opt all
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```
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Once you are ready to switch to optimized version run
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```
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export PETSC_ARCH=linux-gnu-opt
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```
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and reconfigure and recompile INMOST.
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## Compiling INMOST with PETSc support
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Make sure the environment variables `PETSC_DIR` and `PETSC_ARCH` are initialized correctly.
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CMake will detect your PETSc installation if both variables are present.
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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_PETSC=ON ../INMOST-master
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```
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