SIMD与MIMD的区别 #23
Description
为什么说SIMD也有多个处理器？
A SIMD computer consists of n identical processors, each with its own local memory, where
it is possible to store data. All processors work under the control of a single instruction stream; in addition to this, there are n data streams, one for each processor. The processors work simultaneously on each step and execute the same instruction, but on different data elements. This is an example of data-level parallelism. The SIMD architectures are much more versatile than MISD architectures. Numerous problems covering a wide range of applications can be solved by parallel algorithms on SIMD computers. Another interesting feature is that the algorithms for these computers are relatively easy to design, analyze, and implement. The limit is that only the problems that can be divided into a number of subproblems (which are
all identical, each of which will then be solved contemporaneously, through the same set of instructions) can be addressed with the SIMD computer. With the supercomputer developed according to this paradigm, we must mention the Connection Machine (1985 Thinking Machine) and MPP (NASA - 1983). As we will see in Chapter 6, GPU Programming with Python, the advent of modern graphics processor unit (GPU), built with many SIMD embedded units has lead to a more widespread use of this computational paradigm.