OCAS is a computer cluster for HPC (high-performance computing) in astrophysics built during the years 2005 - 2007 at the Astronomical Institute of the Czech Academy of Science in Ondøejov. It is used above all for parallel execution of demanding numerical simulations using MPI parallel environment.
The cluster consists of 16 double-processor, 4 quad-core and 4 oct-core working
nodes (i.e. 80 CPU cores in total), and the master workstation which serves as
the user interface (login node), queue master, and the disc server.
Further information on hardware and software used, as well as users guides can
be found in respective sections of this website. Some documents are accessible
only from the institute internal network.