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Paper Details@InProceedings{JongStiles89,title = "{A} {C}omparison of {P}arallel {I}mplementations of {F}lux {C}orrected {T}ransport {C}odes", author= "Jong, Jingming and Stiles, G. S.", editor= "Wexler, J.", pages = "113128", booktitle= "{OUG}11: {D}eveloping {T}ransputer {A}pplications", isbn= "90 5199 020 0", year= "1989", month= "sep", abstract= "We present the results of comparing implementations of the Flux Corrected Transport (FCT) method on transputers and several other parallel and sequential machines. FCT is a finite difference scheme used to solve fluid dynamics problem which may involve steep gradients or shocks; it has proven useful for both one and twodimensional problems in plasma physics, atmospheric sciences, and detonation studies. The method vectorizes very well and hence runs quickly on supercomputers. Since the calculations at each point involve only a small number of neighbors, the method can also be efficiently implemented on multiprocessor systems. We have run one and twodimensional problems on Transputers and several other systems, including a VAX 8650, a SUN 4/280, a fourprocessor Ardent Titan, an eightprocessor Alliant FX/8, and a fourprocessor Silicon Graphics 240GTX. We shall also compare our results to those obtained by Gustafson (1988) on the NCube/ten.If, in the 1d problem, we consider the speed of a single T800 to be 1.0, the SUN 4/280 ranks at 3.8, the VAX 8650 at 4.0, 8 TSOOs at 7.9, the Silicon Graphics 240GTX at 27.0, the FX/8 at 56.9, and the Titan at 64.4. On the 1d problem, again taking one T800 to have a speed of 1.0, the SUN comes in at 3.6, 16 NCube nodes at 4.0, the 8650 at 4.3, 8 TSOOs at 7.7, the Titan at 65.3, and the FX/8 at 101.4. The transputer ranks highest if we calculate the costeffectiveness of the various systems by dividing the relative speed by the approximate cost. If we assume the 8 TSOOs have a costeffectiveness of 1.0 on the 1d problem, the Titan is second at 0.52, followed by the 240GTX at 0.17, the FX/8 at 0.094, the SUN at 0.081, and the VAX at 0.021." } 
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