A comparison of parallel processing on CRAY X-MP AND IBM 3090 VF multiprocessors
F. Szelényi, Wolfgang E. Nagel · 1989
Modern supercomputers like CRAY X-MP and IBM 3090 VF achieve their high computing speed by using both vector and parallel hardware. The available multitasking concepts supporting concurrent execution of tasks within a single application have been designed for different purposes: owing to the small dispatching overhead, fine-grain parallelism allows parallelization of small units of computation, usually chunks of a DO loop. Larger units of computation, such as arithmetic intensive subroutines, may be processed independently using coarse-grain parallelism.