ICGen ==== Description ----------- ICgen is a generator of initial condition for N-body simulations. It is based on MPI and FFTW 2. It is able to handle a theoretically unlimited number of constraints for generating constrained Gaussian random field. Package content --------------- After unpacking the source package, you have a number of files and subdirectories unpacked in the directory ICgen-X/ (X being the current version code). There are current two subdirectories: "src" and "samples". In "src", you will find the source code of ICgen. In "samples", there are a few sample configuration files that you can look at to get familiar with the parameters. Building instructions ICgen uses an autoconf/automake architecture for building. On standard linux distribution it is usually sufficient to run: .. code-block:: bash ./configure make These two commands checks the availability of a working compiler, MPI, GSL and FFTW2. In general you do not have to do anything. However, if those packages are installed in non-default locations you may have to specify extra arguments to configure, in that case please have a look at the INSTALL file. If everything compiles fine, you have an executable "potin_mpi" in the "src" subdirectory. Running ICgen ------------- For running and generating initial conditions, please execute: .. code-block:: bash mpirun -np X ./potin_mpi CONFIGURATION_FILE with X the number of nodes on which you want to execute the generator. The format of the configuration file is detailed here. Documentation ------------- The documentation for the configuration file is on this page. Download -------- The current public version of ICgen is 0.1-15122009. The current private version is 0.2. The public version can be downloaded from `here `_.