PETSc download and installation¶
This document shows steps to download and install PETSc
PETSc¶
PETSc is an open-source numerical library providing high-performance time-stepping, nonlinear, and linearsolvers. The following are steps to install PETSc
Step 1. Clone PETSc from its git repository
git clone https://bitbucket.org/petsc/petsc.git
Step 2. Set PETSC_DIR and PETSC_ARCH environment variables
Before beginning the installation, let us set two environmental
variables needed by PETSc. The first one is the location of the library,
called PETSC_DIR, and the second one is PETSC_ARCH. When PETSc is
installed, the configuration settings are saved in a directory with the
PETSC_ARCH name set. Thus, this provides flexibility in maintaing
several configuration settings with different PETSC_ARCH. The
environmental variables can set by the export
command in bash shell.
Its best to store environmental variables in .bashrc file in the root
folder. Thus, every time the bash shell is active, all environmental
variables in the .bashrc file are loaded. Here’s how to set the
environmental variables in .bashrc file
cd ~
emacs .bashrc
export PETSC_DIR=<location_of_PETSc directory>
export PETSC_ARCH=<any-arbritraty-name-you-want> for e.g. debug-mode
Save .bashrc file and then source it so that the environmental variables are loaded
source ~/.bashrc
Now, check whether the environment variables are loaded
echo $PETSC_DIR
This should display the PETSC_DIR variable you set previously. If you don’t see anything, then the environmental variable is not loaded.
Step 3. Configure and compile PETSc
cd $PETSC_DIR
./config/configure.py
make
make test
The above commands will configure the PETSc library and compile it. If everything goes correctly then you should see display messages by PETSc that all tests have passed. This completes basic installation of the PETSc library that we need. For additional detailed installation instructions refer to PETSc Installation.