The Free On-line Dictionary of Computing (30 December 2018):

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 Thinking Machines CM5, the Cray C90 and J90, the
   MasPar MP2, and the Intel Paragon.  Work is underway
   (April 1997) on a portable MPI back end, and an
   implementation for symmetric multiprocessors, such as the
   SGI Power Challenge or the DEC AlphaServer.

   Home

(http://cs.cmu.edu/afs/cs.cmu.edu/project/scandal/public/www/nesl.html).

   ["NESL: A Nested Data-Parallel Language", Guy Blelloch,
   CMU-CS-93-129, April 1993].

   (1997-04-13)