Parallel VTK Output Library
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*** Parallel VTK Output (PVO) Library *** Table of contents ================= o Introduction o Requirements o Installation o Known Problems o Future Directions Introduction ============ The Parallel VTK Output (PVO) library provides high-level functionality for parallel output in the VTK XML formats. Requirements ============ To install PVO, you need a C99 compatible C compiler and cmake installed. You can download cmake from http://cmake.org. In order to use the parallel I/O functionality in PVO, you need to have a MPI-2 compliant MPI distribution available. The code was mainly tested with Open MPI (see http://www.open-mpi.org) Installation ============ This guide assumes that you start out in the pvo directory and that the bin directory of cmake is in your $PATH. To install PVO, you should create a new directory for building % mkdir build % cd build If you have an MPI implementation available and the "mpicc" compiler wrapper are in your $PATH, you can simply use % cmake -DCMAKE_INSTALL_PREFIX=<PREFIX> .. where <PREFIX> is the directory where you want to install the headers and library file. To build and install PVO you can type % make % make install By default, the PVO library will use MPI-I/O for the parallel I/O. This can make trouble on NFS mounted devices. As an alternative, the code implements a small low-level layer using POSIX I/O. To enable it, you need to use the option -DPVO_DEFAULT_LOW_IO_LAYER=PVO_LOW_IO_POSIX when calling cmake. If the MPI installation does not support modules (i.e., if "use mpi" does not work in Fortran codes) add the option -DPVO_INCLUDE_MPIF_H=1 to the cmake flags. If no MPI is available on your system, you can still use PVO to do serial I/O. In this case you should add the option -DTPL_ENABLE_MPI:BOOL=OFF to the cmake command. By default, PVO is compiled in a static library (unfortunately, right now not as position-independent code). To compile a shared library, you should add the option -DBUILD_SHARED_LIBS:BOOL=ON to the cmake flags. Fortran support is by default enabled. To disable it you should add the option -DPVO_ENABLE_FORTRAN:BOOL=OFF to the cmake flags. Additional C or Fortran compiler and linker flags can be passed with the usual "CMAKE_C_FLAGS" and "CMAKE_Fortran_FLAGS". Known Problems ============== - pvo_vti_file supports only one file per process (i.e., islands containing a single process) - pvo_vts_file supports only one file per process (i.e., islands containing a single process) Future Directions ================= PVO is a small library and many new features could be implemented: - C++ Interface using Classes - Support for more VTK formats
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