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NESL A parallel language loosely based on ML, developed at Carnegie Mellon University by the {SCandAL} project. NESL integrates parallel algorithms, functional languages and implementation techniques from the system's community. Nested {data parallelism} offers concise code that is easy to understand and debug and suits irregular data structures such as trees, graphs or {sparse matrices}. NESL's language based performance model is a formal way to calculate the "work" and "depth" of a program. These measures can be related to running time on a parallel computer. NESL was designed to make parallel programming easy and portable. Algorithms are typically more concise in NESL than in most other parallel programming languages and the code resembles high-level pseudocode. This places more responsibility on the compiler and run-time system for achieving good efficiency. NESL currently runs on Unix workstations, the {IBM SP-2}, the
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