... We have performed a series of tests to find an optimal data distribution in the Cray T3D memory, and to identify a strategy for the Dynamic Load Balance (DLB). ... N-body simulations are one of the most important tools in contemporary theoretical cosmology, however the number of particles required to reach a significant mass resolution is more larger than those allowed even by present-day state-of-the-art massively parallel (Gouhing 1995; Romeel 1997 & Salmon 1997) supercomputers (hereafter MPP). ...

... Parallel Tree N­body Code: Data Distribution and DLB on the CRAY T3D for Large Simulations U. Becciani, V. Antonuccio­Delogu, M. Gambera and A. Pagliaro Osservatorio Astrofisico di Catania, Citt‘a Universitaria, Viale A. Doria, 6 -- I­95125 Catania ­ Italy R. Ansaloni Silicon Graphics S.p.A. St.6 Pal. ... A bodies data distribution ranging from contiguous blocks (coarse grain: cdir$ shared pos(:block,:)) to a fine grain distribution (tf) (cdir$ shared pos(:block(1),:)) was adopted. ...

IRAF/STECF 2-D spectrum point source / background decomposition package . ... The general problem is one of spectral decomposition - of separating the spectra of the point sources from the background. ... The STECF IRAF layered package "specres" provides two tasks to extract point source spectra from 2-D images (either longslit, multislit or cross-dispersed) and decompose the full background over the image. ... A Point Source Function spectrum image is required as a 2-D spectrum. ...