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In astrophysics numerical star cluster simulations and hydrodynamical methods like SPH require computational performance in the petaflop range. The GRAPE1-family of ASIC-based accel- erators improves the cost-performance ratio com- pared to general purpose parallel computers, how- ever with limited flexibility. The AHA-GRAPE architecture adds an recon- figurable FPGA2-processor to accelerate the SPH computation. The basic equations of the algorithm consist of three parts each scaling with the order of O(N), O(N*Nn) and O(N2) respectively, where N is in the range of 104 to 107 and Nn ~ 50. These equa- tions can profitably be distributed across a host workstation, an FPGA processor and a GRAPE- subsystem. With the new ATLANTIS FPGA-processor we expect a scalable SPH-performance of 1.5Gflops per board. The first prototype AHA-GRAPE system will be available in mid 2000. This 3-layered system will deliver an increase in performance by a factor of 10 as compared to a pure GRAPE solution.

AHA-GRAPE: Adaptive Hydrodynamic Architecture – GRAvity PipE