HPC Seminar at CINECA

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HPC User Support (hpc.cineca.it)

======== HPC SEMINAR AT CINECA ===============================================

Dear users,

on May 22th at 11 am at CINECA (Casalecchio di Reno, Bologna) , Dr. Luca  
Franci by University of Parma will present the seminar titled:

*"Possible optimization and porting of a numerical code for 3D simulations in  
General Relativistic Magnetohydrodynamics on CPU/GPU hybrid clusters"*

 

Abstract:

"General Relativistic Magnetohydrodynamics (GRMHD) is the study of  
relativistic magnetized flows in very strong gravitational fields and  
it’s therefore the right framework for modeling compact objects like  
black holes and neutron stars, which are believed to be responsible for many  
high-energy phenomena in astrophysics.

X-ECHO (Del Zanna et al. 2007, A&A, 473, 1; Bucciantini et al. 2011, A&A,  
528, A101) is a numerical code aimed at performing GRMHD simulations, such as  
the 2D evolution of isolated magnetized neutron stars. The GRMHD conservation  
laws are here solved within a finite-difference discretization scheme whereas  
a staggered constrained-transport method is used to preserve the  
divergence-free condition for the magnetic field.

Since all the computational operations are local, the problem is naturally  
data-parallel via domain decomposition. Actually, X-ECHO is only  
MPI-parallelized along one direction of the full 3D domain and the  
parallelization is not optimized at all, so that the code can be run only on  
a very few processors (up to 8) and one is forced to strongly reduce the size  
of the grid and/or the evolution time in order to get results in a reasonable  
time. A way to get X-ECHO run faster is then to improve the  
MPI-parallelization and to port it on GPUs.

There’s already a GPU-accelerated code for solving the equations of  
GRMHD, which is the HORIZON code by Zink (arXiv:1102.5202v1): a simulation  
performed with a GPU can be at least 10 times faster than one performed on a  
quad-core CPU. Given the high computational cost of 3D full GR simulations,  
an order of magnitude in performance should be enough of an incentive to  
consider the porting of X-ECHO on GPUs."

 

You are invited to attend. Note: The seminar will be held in italian  
language.   Best Regards.
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