High-Level Communication Functions

An extensible object-oriented platform NUTS for distributed computing is described which is based on an object-oriented programming environment NUT, is built on top of the Parallel Virtual Machine (PVM), and hides all low-level features of the latter . The language of NUTS is a concurrent object-oriented programming language with coarse- grained parallelism and distributed shared memory communication model imple- mented on a distributed memory architecture. It dif fers from other languages of con- current programming in the following: concurrent processes are represented by packages which are semantically richer entities than objects, inter -process communica- tion is performed in terms of classes, objects, scripts and packages, using the EDA communication model; processes can be arranged into structured collections: grids which enable one to program data-parallel computations on a high level; sequential segments of programs can be synthesized automatically from specifications repre- sented as classes using the program synthesis features of NUT. Examples of usage of generic parallel computing control structures PARDIF and PARARR are given.