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Paper: astro-ph/9906419
From: Tsuyoshi Hamada
Date: Fri, 25 Jun 1999 23:58:10 GMT (93kb)

Title: PROGRAPE-1: A Programmable, Multi-Purpose Computer for Many-Body
Simulations
Authors: Tsuyoshi Hamada, Toshiyuki Fukushige, Atsushi Kawai and Junichiro
Makino
Comments: 20 pages with 9 figures; submitted to PASJ
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We have developed PROGRAPE-1 (PROgrammable GRAPE-1), a programmable
multi-purpose computer for many-body simulations. The main difference
between
PROGRAPE-1 and "traditional" GRAPE systems is that the former uses FPGA
(Field
Programmable Gate Array) chips as the processing elements, while the latter
rely on the hardwired pipeline processor specialized to gravitational
interactions. Since the logic implemented in FPGA chips can be reconfigured,
we
can use PROGRAPE-1 to calculate not only gravitational interactions but also
other forms of interactions such as van der Waals force, hydrodynamical
interactions in SPH calculation and so on. PROGRAPE-1 comprises two Altera
EPF10K100 FPGA chips, each of which contains nominally 100,000 gates. To
evaluate the programmability and performance of PROGRAPE-1, we implemented a
pipeline for gravitational interaction similar to that of GRAPE-3. One
pipeline
fitted into a single FPGA chip, which operated at 16 MHz clock. Thus, for
gravitational interaction, PROGRAPE-1 provided the speed of 0.96
Gflops-equivalent. PROGRAPE will prove to be useful for wide-range of
particle-based simulations in which the calculation cost of interactions
other
than gravity is high, such as the evaluation of SPH interactions.
\\ ( http://xxx.lanl.gov/abs/astro-ph/9906419 , 93kb)
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