The Cactus software package is representative for a class of scientific applications that are tightly coupled, have reg- ular space decompositions, and involve huge memory and processor time requirements. Cactus has proved to be a valuable tool for astrophysicists, who first initiated its de- velopment. However, today's fastest supercomputers are not powerful enough to perform realistic large-scale astro- physics simulations with Cactus. Instead, astrophysicists must turn to innovative resource environments-in partic- ular, computational grids-to satisfy this need for compu- tational power.
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