Parallel Computer System -Harray-

并行处理系统--Harray--是一个由1000个处理器组成的多处理器系统，旨在快速执行科学计算。因为科学和工程程序都是用FORTRAN语言编写的，所以-Harray-系统的目标是快速执行FORTRAN程序.因为FORTRAN是一种顺序编程语言，所以由编译器来揭示顺序编写的程序中的并行性。然而，顺序语言和并行执行之间的语义差距非常大。因此，该系统采用了“受控数据流”机制来弥合这一语义鸿沟，并充分利用了控制流和数据流机制。在受控数据流机制中，一个FORTRAN程序被分成一组宏块，宏块是一组语句，其中只有一个控制依赖入口点。宏块是其执行由受控数据流机制控制的单元。宏块中的操作由流水机制执行，宏块的执行顺序由受控流机制控制。在本报告所述期间，完成了一个处理单元的电路设计和系统设计。

The parallel processing system -Harray- is a multiprocessor system consisting of one thousand processors aiming at fast execution of scientific computations. The -Harray- system targets fast execution of FORTRAN programs because scientific and engineering programs have been written in FORTRAN. Because FORTRAN is a sequential programming language, it is up to a compiler to expose parallelism in sequentially written programs. However, the semantic gap between a sequential language and parallel execution is very wide. Therefore, the -Harray- system adopts a "Controlled Dataflow" mechanism to bridge this semantic gap and take full advantage of both the control flow and the dataflow mechanism. In the Controlled Dataflow mechanism, a FORTRAN program is devided into a set of macro-blocks, which is a set of statements, including only one entry point of control dependency. A macro-block is a unit whose execution is controlled by the Controlled Dataflow mechanism. Operations in a macro-block are executed by the dataflow mechanism, while the execution order of macro-block is controlled by the controlled flow mechanism.In the period reported in this report, the circuit design as well as the system design of a processing element have been completed.