Abstract:Detailed description of a number of physical and astrophysical effects (star formation, stellar and AGN feedback, metal enrichment, thermal conduction, gas viscosity), which are expected to play a key role in determining the observational properties of galaxies and galaxy clusters. Usage of parallel MPI code P-Gadget2. Recently ported in the PI2S2 GRID. Execution extimated not less than 100,000 CPU/hours for this year.
The application porting was carried out with a modification of the I/O system. In particular a great effort was done for initial condition and intermediate files produced by the code and for the check-point and restart files. The usage of the catalogue was implemented to avoid data replica (each file is not less than 50 Gbytes) and to avoid a great network traffic. An automatic procedure was implemented for the job restarting (a simulation can require many days of run). Moreover the code requires the shared home. <br>The PI2S2 grid node has not this feature, even if a shared scratch exist and used for the code run. However the code needs log files that must be located in the node home directory where it runs. These files are continuously updated and used for the job restart. The complicated code structure required a big effort in the scripting shell system implementation to distribute files at the beginning and to collect data at the end of simulation step.
This activity, even if not directly mentioned in the PI2S2 project, concerns cosmological simulations of the LSSU, as mentioned in the project.
Developed by Stefano Borgani (University of Trieste), G. Murante (INAF Torino), with the collaboration of Ugo Becciani and Fabio Vitello for system management aspects.
<BR><BR><B>Software requirements</B>: MPI Libraries^