DIRAC is configured using CMake , typically via the setup script, and subsequently compiled using make (or gmake). The setup script is a useful front-end to CMake. You need python to run setup. To see all options, run:
$ ./setup --help
The default installation proceeds through three commands:
$ ./setup [--flags] $ cd build $ make
The setup script creates the directory “build” and calls CMake with appropriate environment variables and flags. By default CMake builds out of source. This means that all object files and the final binary are generated outside of the source directory. Typically the build directory is called “build”, but you can change the name of the build directory (e.g. “build_gfortran”):
$ ./setup [--flags] build_gfortran $ cd build_gfortran $ make
You can compile the code on all available cores:
$ make -j
We strongly recommend that the installation is followed by testing your installation:
For more information about testing, see here.
Building DIRAC for parallel runs using MPI is in principle a very simple modification of the above procedure:
$ ./setup [--flags] --mpi $ cd build $ make
Once again we recommend testing the code afterwards.
In order to get familiar with the configuration setup, let us demonstrate some typical configuration scenarios.
Configure for parallel compilation using MPI (make sure to properly export MPI paths):
$ ./setup --fc=mpif90 --cc=mpicc --cxx=mpicxx
There is a shortcut for it:
$ ./setup --mpi
Configure for sequential compilation using ifort/icc/icpc and link against parallel mkl:
$ ./setup --fc=ifort --cc=icc --cxx=icpc --mkl=parallel
Configure for sequential compilation using gfortran/gcc/g++:
$ ./setup --fc=gfortran --cc=gcc --cxx=g++
You get the idea. The configuration is usually good at detecting math libraries automatically, provided you export the proper environment variable MATH_ROOT, see Linking to math libraries.
What to do if CMake is not available or too old?¶
If it is your machine and you have an Ubuntu or Debian-based distribution:
$ sudo apt-get install cmake
$ sudo yum install cmake
Similar mechanisms exist for other distributions or operating systems. Please consult Google.
If it is a cluster, please ask the Administrator to install/upgrade CMake.
If it is a cluster, but you prefer to install it yourself (it’s easy):
- Download the latest pre-compiled CMake tarball
- Extract the tarball
- Set correct PATH variable