Numerical cosmology using special purpose computers: implementing ${\rm P^3M}$ on GRAPE
Session 41 -- Computational Astrophysics II
Display presentation, Wednesday, 1, 1994, 9:20-6:30

## [41.08] Numerical cosmology using special purpose computers: implementing ${\rm P^3M}$ on GRAPE

Philippe P. Brieu (Princeton University Observatory)

An adaptation of the Particle-Particle/Particle-Mesh'' (${\rm P^3M}$) code to the special purpose hardware GRAPE'' is presented.

GRAPE (for GRAvity piPE'') is the generic name for a series of computer chip boards designed by the University of Tokyo to handle N-body'' computations at the speed of supercomputers. It is coupled to a workstation used for other calculations.

Specifically, the PP'' part is done by a four chip GRAPE-3A, while the PM'' part is done on a Sun Sparc 10/51 workstation. The substantial modifications of the original code needed for this implementation are described in detail. The resulting combination achieves about one third of the speed of a Cray C-90 for the fully vectorized ${\rm P^3M}$.

Applications to cosmological simulations are discussed.