Basic HTML version of Foils prepared August 4 1996

Foil 34 Findings 5) and 6) -- Layered Software

From Summary of Working Groups at PAWS and PetaSoft Meetings PAWS(Mandalay Beach) and PetSoft(Bodega Bay) -- April 23 and June 17-19,96. by Geoffrey C. Fox
5)One needs a layered (hierarchical) software model which supports an efficient use of multiple levels of abstraction in a single program.
  • Higher levels of Programming model hide extraneous complexity
  • highest layers are application dependent Problem Solving Environments and lower levels are machine dependent
  • Lower levels can be accessed for additional performance
  • e.g. HPF Extrinsics. Gcc ASM, MATLAB Fortran Routines, Native classes in Java
6)One needs a set of software tools which match the layered software (programming model)
  • Debuggers, Performance and load balancing tools

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